Table 1. Analytical Method Validation Parameters for Toxic Elements and Arsenic Species.

					spike recovery (%)
analyte	linearity	LOD (μg/kg)	LOQ (μg/kg)	CV (%)	lowb	mediumb	highc
Total Toxic Elements
Cd	0.99998	0.0830	0.274	1.09	90.6	104	97.6
Pb	0.99992	0.0521	0.172	0.882	94.7	93.5	104
tAs	0.99998	0.0669	0.221	1.40	103	92.1	98.4
Inorganic As Species
As3+	0.9995	1.12	3.72	2.83	91.2	96.3	92.4
As5+	0.9991	2.38	7.94	3.37	93.2	91.6	90.5
Organic As Species
AsC	0.9994	1.08	3.57	2.92	92.7	91.5	93.1
AsB	0.9993	1.00	3.34	2.64	101	92.6	104
DMA	0.9996	0.732	2.44	2.11	103	96.0	97.7
MMA	0.9994	0.978	3.26	2.76	103	98.2	107

^aAdded 10 μg/L each of Cd and Pb and 500 μg/L of tAs and each As species to the sample for three (n = 3) measurements.

^bAdded 50 μg/L each of Cd and Pb and 250 μg/L of tAs and each As species to the sample for three (n = 3) measurements.

^cAdded 150 μg/L each of Cd and Pb and 5000 μg/L of tAs and each As species to the sample for three (n = 3) measurements.