Ultratrace Determination of Cr(VI) and Pb(II) by Microsample Injection System Flame Atomic Spectroscopy in Drinking Water and Treated and Untreated Industrial Effluents

Table 2

The results for tests of addition/recovery for Cr(VI) by DLLME in industrial wastewater samples (𝑛=6).

	Amount added; (µg/L)	Found values; Mean ± SD (µg/L)	%Recovery^a	%RSD
Cr(VI)	—	12.5±2.4	—	—
	10	24.7±0.3	110.0±1.5	1.4
	25	40.7±0.7	108.0±1.8	1.7
	50	61.4±3.4	98.5±3.3	3.4
Pb(II)	—	10.4±1.5	—	—
	10	20.5±0.4	100.5±2.2	2.0
	25	35.2±0.8	99.4±1.7	2.3
	50	59.8±1.8	99.0±1.2	3.0

a%Recovery = (𝐶_afterspiked/(𝐶_intial+𝐶_spiked))×100.