*2.4. Statistical Analysis*

Data for the concentrations of chemical elements were processed to obtain the mean and standard deviation of the mean (SD). One-way analysis of variance, followed by a Student's *t*-test was used to compare the mean values. A value of *p* < 0.05 was considered to be statistically significant.


**Table 1.** Results and recoveries for chemical element contents (mg/kg) determined in NIST SRM 1573a Tomato leaves (three parallel determinations).
