Development and Validation of a New Method for Determination of Pb and Cr in Marine Organisms by Total Reflection X-Ray Fluorescence (TXRF) Spectroscopy

Table 1

Figures of merit for the simultaneous determination of Pb and Cr by the TXRF method.

Analytical parameters	Pb	Cr
Detection limit (μg·L^−1) (n = 10)	1.573	0.709
Quantification limit (μg·L^−1) (n = 10)	5.242	2.363
Regression coefficient r^2 (n = 10)	0.998	0.999
Repeatability (RSD %) (n = 10, 5 μg·L^−1)	5.1	4
Reproducibility (RSD %) (n = 5, 5 μg·L^−1)	3.6	1.8
Linear working range (μg·L^−1)	5.242–100	2.363–100
Sample volume (μL)	10	10
Sample frequency (h^−1)	20	20