Table 2.

Spike-recovery results for tap water and soil samples determined by ELISA and HPLC.

Samples	Spiked concentration (μg/ml)	Concentration (μg/mL)		Average recovery (%)		CV (36)
		ELISA	HPLC	ELISA	HPLC	ELISA	HPLC
Tap water	0.4	0.42±0.04	0.36±0.04	105	90.0	9.52	11.1
	4.0	4.08±0.11	3.76±0.0 5	102	94.0	2.70	1.33
	32.0	31.3±1.35	32.2±2.06	97.8	100.6	4.31	6.40
Soil	4.0	4.16±0.33	3.60±0.3l	104	90.0	7.93	8.61
	40	42.0±3.15	41.2±3.23	105	103	7.50	7.84
	320	320.8±4.26	319.6±5.18	100.3	99.8	1.33	1.62