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Article

Inhibitory Effect of Combined Exposure to Copper Ions and Polystyrene Microplastics on the Growth of Skeletonema costatum

by
Haoyuan Liu
1,
Yu Zhen
1,2,*,
Xiuli Zhang
3 and
Lianyu Dou
1,2
1
College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
2
Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China
3
Sanya Oceanographic Institute, Ocean University of China, Sanya 572024, China
*
Author to whom correspondence should be addressed.
Water 2024, 16(16), 2270; https://doi.org/10.3390/w16162270
Submission received: 3 July 2024 / Revised: 7 August 2024 / Accepted: 10 August 2024 / Published: 12 August 2024
(This article belongs to the Topic Coastal Macro-, Meso-, and Microplastic Pollution: Effects on the Health of Humans and Ecosystems)
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Abstract

:
As two significant pollutants, the increased concentrations of copper ions and microplastics in coastal waters pose a substantial threat to the health of marine ecosystems. This study explored the individual and combined toxic effects of copper ions and microplastics on the marine diatom Skeletonema costatum. The results indicated that copper ions at a concentration of 0.05 mg/L exerted a negative impact on the growth of S. costatum; however, the influence of microplastics on algal cell growth was more complex: there was no significant inhibition of algal cell growth observed within the first 72 h of cultivation, but a pronounced negative effect on cell growth was noted between 72 and 96 h, with high concentrations (10.00 mg/L) of microplastics even causing a premature stagnation phase in algal cell growth. When both pollutants were present simultaneously, their impact on cell growth was similar to that of the microplastic pollution group, yet the growth condition was better than that of the copper ion pollution group. Through investigation of adsorption rates and toxicity mitigation rates, it was found that the adsorption of copper ions by microplastics was a significant reason for the improved growth condition of algal cells in the mixed pollution group compared to the copper ion pollution group. However, in the later stages of cultivation, the inhibitory effect of microspheres on algal cell growth counteracted their mitigating effect on copper ion toxicity. This study provides a reference for evaluating the impact of microplastics and heavy metals on coastal ecosystem health and for revealing the interactions between different pollutants.

1. Introduction

With the development of industrialization and urbanization in Chinese coastal areas, sewage and wastewater containing all kinds of heavy metals eventually discharge into the sea through outfall pipes, groundwater and other ways, which leads to the continuous increase of heavy metal content in the marine environment [1]. Among these kinds of heavy metal pollution, copper pollution is a representative and serious category, which is mainly because the pollution sources are various, including copper mining and biological oxidation [2], metal smelting and processing, machinery manufacturing, etc. The commonly used copper pollution treatment methods, such as the reverse osmosis membrane method, although effective, are expensive and difficult to promote, so it is also difficult for the departments concerned to control this type of pollution [3]. In the coastal waters of China, for example, the concentration of heavy metal ions, especially copper ions in the Beibu Gulf, has been gradually increasing in the past 20 years [4,5]. In the East China sea, the concentration of copper ions in nearshore sediments has reached 23.7 mg/kg (dw), which is a really high level [6]. In other countries, such as Moreton Bay, Australia, the average concentration of copper ions will increase to more than twice as much in the next century, causing enormous harm to biology and the ecological environment [7]. Marine copper pollution has become a widely concerning environmental issue, and the ecological risks and pollution monitoring of heavy metal pollution, especially copper pollution, have become a global problem [8,9].
Plastic has the characteristics of low price, light weight, biological inertia and so on. Since its invention, it has been widely used in commerce and industry, resulting in the accumulation of plastic waste in the environment [10,11]. It is estimated that tens of millions of tons of plastic waste were discharged into the coastal area in the last 20 years [12], and it is expected that the amount of plastic waste entering the marine environment will increase to nearly 100 million tons by 2025 [13]. In the natural environment, plastic waste gradually decreases under the combined action of various factors. Plastic waste is usually divided into macro-, meso-, micro-, and nanoplastics. Microplastics are plastic particles with a particle size of less than 5 mm, while nanoplastics have a particle size of less than 1 μm. Both are collectively referred to as micro-nano plastics in the fields of environmental science and materials science [12]. Besseling et al. [14] mentioned in a review that the concentration of microplastics in the marine environment will reach at 129.4 pieces/L in 2100 in the context of business as usual. After being discharged into water and ingested by organisms, it will accumulate through the food chain, which is not only harmful to aquatic organisms, but also negative to human health [15]. Compared with other microplastics, the abundance of polystyrene (PS) microplastics in the water environment is higher; therefore, researchers have paid more attention to the toxic effect of PS plastics [16,17].
Skeletonema costatum is a kind of plankton widely distributed in the ocean and coastal zone. As one of the most abundant members of the diatom genus, it has strong carbon fixation ability, is the main producer of organic carbon in the ocean, and has an important influence on the global carbon cycle [18]. In addition, it also has the characteristics of strong stress resistance, rapid growth, and easy cultivation. Therefore, it is often regarded as the research object of algae biology and toxicology [19,20]. Given the significant harm of copper ions and PS microplastics to the marine environment, it is of great significance to study their effects on the normal life activities of Skeletonema costatum.

2. Background

As two important pollutants in the water environment, heavy metal and microplastic pollution have gradually become the focus of environmental science and toxicology research [12,15,21]. In recent years, many scholars have conducted research on the effects of copper ions or microplastics on algae. For example, cadmium ions can cause a decrease in chlorophyll content and increase of reactive oxygen species in Dunaliella salina [22]; Copper ions can cause a slowdown in the growth rate of Skeletonema marinoi and an increase in the activity of stress resistant enzymes of S. costatum [23,24]. Mir et al. [25] generally believe that excessive concentrations of copper ions have a negative impact on the growth of algae cells.
However, the impact of microplastics on the growth of microalgae is relatively complex. Mao et al. [26] have found that PS microplastics exhibit an effect of first inhibiting and then promoting the growth of Chlorella sp. during its growth process; Long et al. [27] have also found that polystyrene microplastics have no significant effect on the growth of Tisochrysis lutea and Heterocapsa triquetra; Wang et al. [28] found that polystyrene microplastics have a significant inhibitory effect on the growth of Chaetoceros curvisetus.
As for the combined toxic effects of heavy metals and microplastics on algae, it is still under continuous exploration. Xie et al. [29] found that PVC microplastics have no significant inhibitory effect on the growth of Chlorella vulgaris when coexisting with zinc ions. Lin et al. [30] also found that the combined effect of polyacrylonitrile microplastics and copper ions was not significantly different from the effect of copper ions alone on Chlorella vulgaris. But some studies have also found that polystyrene microplastics, when coexisting with copper ions, can have a negative impact on the life activities of Pseudokirchnerlla subcapitata [31]. It can be seen that the combined toxicity of microplastics and heavy metals to algae is more complex.
It is worth noting that the interaction between heavy metals and microplastics, especially the adsorption–desorption effect, has a significant impact on the toxicity of pollutants to organisms [32,33]. Bao et al. [34] found that both PA and PET plastic particles in aquatic environments have strong adsorption effects on copper ions, and this adsorption effect is related to the number of oxygen-containing functional groups on the surface of microplastics; PA microplastics with more functional groups have a stronger adsorption effect on copper than PET, in theory. Xue et al. [35] found that a certain concentration of aged PS plastic particles can achieve a theoretical high adsorption capacity of 15 mg/kg for divalent mercury ions, which would greatly affect their combined toxicity to aquatic organisms. However, there is little research on the combined stress of copper ions and PS microplastics on algal cells, especially for key species like S. costatum.
In conclusion, the combined toxic effects of copper ions and microplastics on algae need to be deeply analyzed, and the effect of their adsorption on their biological toxicity also needs to be further explored. This study undertakes a biological analysis of the effect of copper ions and microplastics on growth, thus providing a basis for algal biology and research into the ecological effects of pollutants, thus revealing the interaction between pollutants, microplastics and heavy metals on the coastal sea ecosystem.

3. Materials and Methods

To investigate the effect of different concentrations of microplastics on copper ion toxicity, this experiment used a culture medium containing 0.05 mg/L copper ions and 1 μm particle size PS microspheres with a certain concentration gradient to conduct cultivation experiments and pollutant adsorption experiments on ribbed algae. By observing and statistically measuring the growth of algal cells and the adsorption of copper ions, corresponding experimental results were obtained.

3.1. Algal Origin and Cultivation

The algae selected for this study were stored in the Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China. As a routine procedure, we use glass culture containers. According to Jin et al. [36], glass containers have a certain adsorption effect on Cu2+, but its rate is slow, and the adsorption effect on copper ions within 96 h can be ignored. Also, it does not introduce plastic interference. With sterilized f/2 medium, algal cells of different treatments were cultured in a 20 °C constant temperature light incubator (GXZ-310B, Ningbo Jiangnan Instrument Factory, Ningbo, China). The light-dark cycle was 12 h:12 h, and the light intensity was 3000 lx.

3.2. Experimental Reagents

The copper salt used in this experiment was CuSO4·5H2O (Sinopharm Holdings, analytically pure), 0.1 mol/L copper sulfate reserve solution was prepared before use and added to the culture medium after dilution. Microplastics were monodisperse polystyrene (Polystyrene, PS) microballs (Jiangsu Zhichuan Technology Company, Jiangsu, China) with particle size of 1 μm and solid content of 2.5%, which are also used after dilution.

3.3. Algal Cell Growth Experiment Design

According to Chinese seawater quality standards, when the concentration of copper ions reaches 0.05 mg/L, it exceeds the limit values of the four types of water quality standards, indicating that the seawater is polluted to a certain extent by copper ions [37]. As mentioned in the first part of this article, according to the density of PS particles [14], we believe that when there are 1–10 mg microplastic particles per liter of seawater, the water has already been severely polluted. Therefore, the copper ion concentration for the copper ion pollution group is set to 0.05 mg/L, and the PS microsphere concentration is set to: 2.50 mg/L, 5.00 mg/L, 7.50 mg/L, and 10.00 mg/L. The experimental groups and their corresponding pollutant concentrations are detailed in Table 1.
The initial cell concentration was 2 × 105 cells/mL, the culture volume was 100 mL, and 3 parallel samples were set up for 96 h. After the start of the experiment, algal cell concentration was measured every 24 h and growth curves drawn.

3.4. The Adsorption Experiment

To study the adsorption effect of microplastics on copper ions, mixed contamination groups I to IV (containing 0.05 mg/L copper ions, PS microsphere concentration was 2.50 mg/L, 5.00 mg/L, 7.50 mg/L and 10.00 mg/L, respectively). No algal cells were added to the culture system of the adsorption experiment, and the remaining conditions were exactly the same as those in the algal cell growth experiment. In the chart shown in this article, they are referred to as mixed groups I–IV (NC) to distinguish them from the mixed group in algal cell culture experiments.

3.5. Sample Processing

Samples were taken every 24 h after the start of the experiment. The algal cell counting sample was temporarily stored in a 2mL centrifuge tube and fixed with Luge reagent (Beijing Solai Biotechnology Co., Ltd., Beijing, China) before counting. As for the free copper ion sample, 10mL of culture medium was taken from each culture bottle in the adsorption experiment, and PS microspheres were filtered through a 0.45 μm filter membrane (Jinteng Technology, Tianjin, China). The filtrate was refrigerated at 4 °C. After all experiments were completed, ICP-MS was used to detect free copper ions in the samples.

3.6. Measurement of the Experimental Parameters

The algal cell density was counted by cell counting plate: 100 μL algal fluid was applied to the cell counting plate, and counted under a microscope (BX 51, Olympus, Tokyo, Japan) to discover the algal cell density in the sample (unit: 105 cells/mL). The content of free copper ions in the adsorption experiment was determined by inductively coupled high-frequency plasma mass spectrometry (305X, PerkinElmer, Waltham, MA, USA). The specific method is as follows: prepare the copper ion standard solution, open the ICP-MS instrument switch, complete the ventilation and ignition operations in turn, and enter the sample through the injection tube to draw the standard curve. The sample solution is then analyzed by the same method to obtain the concentration of copper ions not adsorbed in the sample.

3.7. Experimental Data Processing

For algal cell growth and adsorption experimental detection data, differential significance analysis was performed using a t-test and plot using Origin 2024.
In this experiment, the adsorption rate of PS microspheres for copper ions (ADR) and the alleviation rate of PS microspheres for copper ion toxicity (ALR) was also calculated as follows:
A D R = I C O C − C O C A I C O C × 100 % A L R = M C C − C I C C C N C C − C I C C × 100 %
ICOC: Initial concentration of copper ions
COCA: Concentration of free copper ions after absorbtion
MCC: Mixed pollution group algal cell concentration
CICC: Copper ion group algal cell concentration
CNCC: Control group algal cell concentration
The correlation between the two sets of data is judged on the ADR (X) and the ALR (Y) after the data correlation analysis. To make the relationship between the two more intuitive, each group of data was drawn into a scatter plot, and the model was selected for fitting according to the analysis results.

4. Results and Discussion

4.1. The Adsorption of Copper Ions by Microplastics of Different Concentrations

Figure 1 shows the change of free copper ion concentration in the adsorption experiment. According to the figure, the adsorption effect of PS microspheres on copper ions was extremely significant (p < 0.05). In the first 24 h of the fastest adsorption rate, the higher the PS concentration, the stronger the adsorption of copper ions (p < 0.05). After the 48th hour of the experiment, there was no significant difference in the culture system (p > 0.05).
The adsorption kinetics of copper ions affected by microplastics basically coincides with the characteristics of the first-order reaction dynamics. With time, the adsorption rate is first fast and then slow, until equilibrium is finally reached [38,39]. When the concentration of microplastics in the solution is high, the collision probability with copper ions is greater, and the adsorption capacity is larger, so the adsorption rate gradually increases with the concentration of microplastics at the beginning of the reaction.

4.2. Effects of Copper Ions and Microplastics on Algal Cell Growth

According to Figure 2, 0.05 mg/L copper ions produced an extremely significant inhibitory effect on the growth of algal cells (p < 0.01). From this, it can be seen that 0.05 mg/L copper ions have a significant toxic effect on algal cells, which can rapidly decrease the growth rate of algal cells. However, the four concentrations of PS microspheres set in the experiment had no significant effect on algal cells in the first 48 h of the cultivation process (p > 0.05). After the last 48 h of growth (p < 0.05), the algae cells in the control group were still in the logarithmic phase and the growth rate of cell density was kept at a higher growth rate at 3.0 × 105 cells/day. However, the growth rate of the experimental group containing PS microspheres slowed from the original 3.0 × 105 cells/day~4.0 × 105 cells/day to less than 1.5 × 105 cells/day, even reaching a plateau.
It can be seen that both copper ions and PS microspheres inhibit algal cell growth, but the acute toxic effect of the copper ions in the experimental concentration on algal cells is significant, while the inhibition of PS microspheres on growth was reflected in the last 48 h of the experiment. However, when these two pollutants coexist, although they still inhibited the growth of algal cells, the inhibition of algal cell growth was weakened compared with the presence of only copper ions, which was significantly reflected in the experimental group containing low and medium concentrations of PS microspheres (2.50–7.50 mg/L) (p < 0.05). This indicates that the PS microspheres can reduce the toxic effect of copper ions on algal cells in this experiment. However, in the latter half of the incubation time, the inhibitory effect of the mixed contamination on the algal cell growth became more obvious compared to the first 48 h.
A series of studies have shown that when the concentration of copper ions in the culture system exceeds the tolerance range of algal cells, the cells will accumulate copper ions, leading to damage of a variety of organelles in cells, degeneration and inactivation of proteins, and inhibition of various enzymes involved in biochemical reactions from their normal roles, thus rapidly inhibiting the life activities of algal cells [40,41,42,43]. The presence of microplastics will promote the algal cells to produce reactive oxygen species, damage the cell membrane and the chloroplast membrane, and affect the photosynthesis of the algal cells [44]. In addition, the diameter of the cell is about 6–7 μm, while the diameter of PS microspheres used in this experiment is 1 μm. PS particles may also adsorb on algal cells and interfere with the absorption of nutrient salts by algal cells, thus inhibiting their growth [45]. When PS microspheres coexist with copper ions, the interaction of the two would make the mixture less toxic to algal cells than when copper ions are present alone.

4.3. The Adsorption Rate of Microplastics to Copper Ions and the Remission Rate of Copper Ion Toxicity

After the calculation (the results is in Table 2) and correlation analysis, we found that the adsorption rate and the remission rate were positively correlated, but the degree of correlation varied according to the culture stages. This is confirmed by a linear fit (Figure 3). However, by investigating the data points of the copper ion adsorption rate and toxicity remission rate in the last 48 h of the culture stage, it was found that the PS adsorption of copper ions by each mixed pollution group no longer had a significant mitigation effect on the inhibition of cell growth. This is probably because the algae cell growth of the experimental group containing only the PS microspheres was significantly inhibited in the last 48 h as compared to the first 48 h. The negative effect of PS microspheres on algal cell growth in culture began to appear later, which could offset the mitigation of PS microsphere to copper ion toxicity.
But overall, the more adsorption of copper ions by PS microspheres, the less the inhibitory effect of these two pollutants on algal cell growth. At this point, we can conclude that the adsorption of copper ions by PS microspheres is an important reason for the weaker inhibitory effect on algal cell growth in the presence of both pollutants compared to the presence of copper ions alone.

4.4. Summary and Further Discussion

We found the effects of copper ions and PS microplastics on the growth of S. costatum at experimental concentrations. As an important group of planktonic organisms in coastal waters, this study can be used to evaluate the impact of these two pollutants on nearshore ecosystems; in addition, the interaction between PS microplastics and copper ions also affects the toxic effect of copper ions on algal cells, providing inspiration and reference for further exploration of pollutant interactions.
Some readers may ask why there are no algae cells in the culture system during adsorption experiments. As mentioned earlier, algae cells absorb copper ions, which affects adsorption. However, according to the experimental results, in the presence of microplastics, especially during the first 48 h of cultivation, the toxic effect of copper ions on algal cells is minimal. In other words, under these conditions, the absorption of copper ions by algal cells can be ignored.
It is worth mentioning that the study by Zhu et al. [46] on the interaction between copper ions and microplastics on the toxicity of pollutants is highly similar to this experiment. They investigated the toxicity of copper nanoparticles and PVC on ribbed algae. It was found that adsorption of copper ions on mPVC and aggregation between copper nanoparticles and mPVC are the main reasons for the impact on toxicity of nanocopper with added microplastics. This is highly consistent with our research results.
But what sets us apart is that the copper ions in the culture medium used in our laboratory are completely derived from the ionization of copper salts, while Zhu et al. used nano-copper particles, the copper ions of which in water are not entirely generated by dissolution ionization. More importantly, we use PS, while Zhu et al. used PVC as the MPs. Brennecke et al. [47] showed that under certain conditions, PVC has a stronger adsorption capacity for copper ions than PS. Therefore, even though Zhu et al. confirmed the adsorption effect of PVC on copper ions, the adsorption of PS on copper ions still needed to be explored. Our study still has innovation and scientific significance.

5. Conclusion

The following conclusions can be drawn from this experiment:
(1) 0.05 mg/L of copper ions significantly inhibited algal cell growth.
(2) PS microspheres had no obvious effect on algal cells in the first 48 h of the experiment. In the late culture period, PS microspheres will cause a decrease in algal cell density, and when the concentration of PS microsphere is too high, they will advance the plateau of algal cell growth, which is different from copper ion contamination.
(3) The coexistence of PS microspheres and copper ions can alleviate their toxicity on algal cells to some extent. The reason is that the PS microspheres have an adsorption effect on copper ions in the early culture period.
In summary, the adsorption of copper ions by PS microspheres is an important reason why the pre-growth condition of algae cells is better under mixed pollution of PS and copper ions than under pollution solely by copper ions. In the later stage of cultivation, the negative impact of microplastics on algal cell growth began to emerge, offsetting its weakening effect on copper ion toxicity.

6. Prospect

Firstly, the physicochemical properties of microplastics vary with different types, particle sizes, and formation processes, resulting in different inhibitory effects on algal cell growth and adsorption effects on heavy metal ions. However, the feasibility of comprehensively exploring the effects of heavy metal–microplastic combined exposure on phytoplankton by replacing experimental materials is not strong. Our research team believes that in the future, we should start from the adsorption–desorption behavior between microplastics and heavy metal ions, as well as the inhibitory mechanisms of these two types of pollutants on the life activities of phytoplankton, to explore general conclusions or quantitative and semi-quantitative models, in order to have a deeper understanding of the interactions between heavy metals, microplastics, and phytoplankton.
In addition, this study also provides ideas for preventing and controlling heavy metal pollution in the ocean. In addition to reducing pollutant emissions at the source, high-performance and environmentally friendly adsorption materials can also be developed, which can be deployed in areas with severe heavy metal pollution to achieve remediation goals.

Author Contributions

Topic proposal, experimental design, experimental operation, data analysis: H.L.; experimental guidance: Y.Z., X.Z. and L.D.; writing: H.L.; review and revision: Y.Z. All authors have read and agreed to the published version of the manuscript.

Funding

Students Research and Development Program of Ocean University of China (OUC-SRDP), Project No. 202310423423X.

Data Availability Statement

Data will be made available on reasonable request.

Acknowledgments

This study is an extension project of OUC-SRDP (202310423423X), and part of the experimental funding is supported by OUC-SRDP. The research direction was conceived by the author of this article based on the research results of the other four students, Zongxue Jing, Jinlai Hua, Hongmei Tan, and Yonghui Fang. We express our sincere gratitude to them here.

Conflicts of Interest

The authors declare no conflicts of interest.

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Water 16 02270 g001
Figure 1. Changes in the concentration of copper ions in the culture system that were not adsorbed by PS in the adsorption experiment.
Figure 1. Changes in the concentration of copper ions in the culture system that were not adsorbed by PS in the adsorption experiment.
Water 16 02270 g001
Water 16 02270 g002
Figure 2. The effects of copper ions and microplastics on the growth of algal cells. (A) The effect of copper ions alone and coexisting with PS on cell growth, and (B) the effect of PS alone on cell growth.
Figure 2. The effects of copper ions and microplastics on the growth of algal cells. (A) The effect of copper ions alone and coexisting with PS on cell growth, and (B) the effect of PS alone on cell growth.
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Water 16 02270 g003
Figure 3. Relationship between the adsorption rate of PS microspheres for copper ions and their alleviation rate for copper ion toxicity. (The positive correlation between ADR and ALR was high in the first 48 h, weakened in the 72nd hour, and did not show a positive correlation in the 96th hour).
Figure 3. Relationship between the adsorption rate of PS microspheres for copper ions and their alleviation rate for copper ion toxicity. (The positive correlation between ADR and ALR was high in the first 48 h, weakened in the 72nd hour, and did not show a positive correlation in the 96th hour).
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Table 1. Experiment for growth of algal cells.
Table 1. Experiment for growth of algal cells.
GroupCu2+ Concentration (mg/L)PS Concentration (mg/L)
Contral group0.000.00
Copper group0.050.00
PS group I0.002.50
PS group II0.005.00
PS group III0.007.50
PS group IV0.0010.00
Mixed group I0.052.50
Mixed group II0.055.00
Mixed group III0.057.50
Mixed group IV0.0510.00
Table 2. The relationship between ADR and ALR for each groups at different sampling times. (There is no distinction between mixed group and mixed group (NC) here).
Table 2. The relationship between ADR and ALR for each groups at different sampling times. (There is no distinction between mixed group and mixed group (NC) here).
24 hADR (×100%)ALR (×100%)48 hADR (×100%)ALR (×100%)
Mixed group I0.6530.489Mixed group I0.7380.502
Mixed group II0.7420.659Mixed group II0.7550.431
Mixed group III0.7440.976Mixed group III0.7670.637
Mixed group IV0.7680.999Mixed group IV0.7750.971
72 hADR (×100%)ALR (×100%)96 hADR (×100%)ALR (×100%)
Mixed group I0.7450.702Mixed group I0.7670.481
Mixed group II0.7620.575Mixed group II0.7260.310
Mixed group III0.7920.596Mixed group III0.7960.307
Mixed group IV0.7500.371Mixed group IV0.7850.007
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Liu, H.; Zhen, Y.; Zhang, X.; Dou, L. Inhibitory Effect of Combined Exposure to Copper Ions and Polystyrene Microplastics on the Growth of Skeletonema costatum. Water 2024, 16, 2270. https://doi.org/10.3390/w16162270

AMA Style

Liu H, Zhen Y, Zhang X, Dou L. Inhibitory Effect of Combined Exposure to Copper Ions and Polystyrene Microplastics on the Growth of Skeletonema costatum. Water. 2024; 16(16):2270. https://doi.org/10.3390/w16162270

Chicago/Turabian Style

Liu, Haoyuan, Yu Zhen, Xiuli Zhang, and Lianyu Dou. 2024. "Inhibitory Effect of Combined Exposure to Copper Ions and Polystyrene Microplastics on the Growth of Skeletonema costatum" Water 16, no. 16: 2270. https://doi.org/10.3390/w16162270

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