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 2

Simultaneous determination of Pb and Cr in marine samples.

Sample ID	Lead			Chromium
	Added (μg·L^−1)	Found (μg·L^−1)^b	Recovery (%)	Added (μg·L^−1)	Found (μg·L^−1)^b	Recovery (%)
TOP-033^a	0	34.20 ± 1.50	—	0	37.10 ± 0.012	—
	20	53.80 ± 0.07	98	20	57.20 ± 0.09	100
TIB-15^a	0	32.40 ± 0.07	—	0	40.50 ± 0.20	—
	20	51.30 ± 0.10	95	20	60.70 ± 0.20	101
GSD-03^a	0	12.10 ± 0.06	—	0	53.30 ± 0.05	—
	20	31.20 ± 0.10	96	20	71.30 ± 0.02	90

^aThe results are reported as the Pb and Cr concentration in the analyzed solutions. ^bThe results are expressed as the mean value ± SD (n = 3).