Free Base Porphyrins as Ionophores for Heavy Metal Sensors
Abstract
:1. Introduction
2. Results and Discussion
2.1. Response characteristics of the electrodes
2.2. Potentiometric selectivity
2.3. Effect of the pH
2.4. Analytical applications
Silver-selective sensor
Lead-selective sensor
Copper-selective sensor
3. Conclusions
4. Experimental Section
4.1. Reagents
4.2. Electrode preparation and measurements
4.3. Sample extraction for chloride determination
Acknowledgments
References
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Sensor | Ionophore (I) | Composition of membranes (w/w) | Working conc. Range (M) | Slope (mV/decade) | |||||
---|---|---|---|---|---|---|---|---|---|
I | PVC | Add | DOS | DOP | NPOE | ||||
1 | A | 5 | 165 | 2 | - | 330 | - | 5×10-5 − 1×10-1 | 31.5 |
2 | 5 | 165 | 2 | 330 | - | - | 1×10-5 − 1×10-1 | 26.9 | |
3 | 5 | 165 | 2 | - | - | 330 | 1×10-5 − 5×10-2 | 32.2 | |
4 | 10 | 165 | 5 | 330 | - | - | 1×10-5 − 1×10-1 | 49.7 | |
5 | 10 | 165 | 5 | - | - | 330 | 1×10-5 − 1×10-1 | 57.9 | |
6 | 5 | 150 | 2 | 200 | - | - | 5×10-4 − 1×10-1 | 35.4 | |
7 | B | 10 | 165 | 5 | - | 330 | - | 3×10-5 − 1×10-1 | 61.9 |
8 | 10 | 165 | 5 | 330 | - | - | 8×10-6 −1×10-1 | 64.5 | |
9 | 10 | 165 | 5 | - | - | 330 | 1×10-5 − 1×10-1 | 55.8 |
Meat product | Potentiometric titration | Volhard titration |
---|---|---|
Pate | 12,3 ± 0,1 | 12,4 ± 0,1 |
Parizer | 13,2 ± 0,2 | 13,1 ± 0,3 |
Salami | 13,5 ± 0,1 | 13,6 ± 0,2 |
Sausage | 15,9 ± 0,1 | 16,0 ± 0,2 |
Sample | Potentiometric μg/ml ± SD (n = 4) | AAS μg/ml ± SD (n = 4) | Recovery % |
---|---|---|---|
1* | 11.1 ± 0.3 | 10.3 ± 0.2 | 99.1 |
2* | 31.6 ± 0.4 | 30.9 ± 0.3 | 101.6 |
3* | 41.7 ± 0.3 | 41.0 ± 0.2 | 100.6 |
wastewater | 30.1 ± 0.4 | 29.8 ± 0.2 |
Method | * mg/mL Cu2+ | Recovery % |
---|---|---|
Direct potentiometry | 3.24 ± 0.3 | 96.1 |
Standard addition potentiometry | 3.23 ± 0.4 | 95.8 |
AAS | 3.33 ± 0.2 | 98.8 |
© 2008 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland. This article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution license ( http://creativecommons.org/licenses/by/3.0/).
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Vlascici, D.; Fagadar-Cosma, E.; Pica, E.M.; Cosma, V.; Bizerea, O.; Mihailescu, G.; Olenic, L. Free Base Porphyrins as Ionophores for Heavy Metal Sensors. Sensors 2008, 8, 4995-5004. https://doi.org/10.3390/s8084995
Vlascici D, Fagadar-Cosma E, Pica EM, Cosma V, Bizerea O, Mihailescu G, Olenic L. Free Base Porphyrins as Ionophores for Heavy Metal Sensors. Sensors. 2008; 8(8):4995-5004. https://doi.org/10.3390/s8084995
Chicago/Turabian StyleVlascici, Dana, Eugenia Fagadar-Cosma, Elena Maria Pica, Viorica Cosma, Otilia Bizerea, Gheorghe Mihailescu, and Liliana Olenic. 2008. "Free Base Porphyrins as Ionophores for Heavy Metal Sensors" Sensors 8, no. 8: 4995-5004. https://doi.org/10.3390/s8084995