Arsenic Species Analysis at Trace Level by High Performance Liquid Chromatography with Inductively Coupled Plasma Mass Spectrometry

Table 4

Analytical results and recoveries of the sediment pore-water samples.

Depth; (cm)	Arsenic species	Concentration; (µg/L) ± S.D.	Added (µg/L)	Found; (µg/L)	Recovery; (%)
0	AsB	N.D.	0.500	0.503 ± 0.002	100.6
	AsC	N.D.	0.500	0.495 ± 0.005	99.0
		0.217 ± 0.003	0.500	0.708 ± 0.002	98.2
	DMA	0.530 ± 0.002	0.500	1.032 ± 0.009	100.4
	MMA	0.012 ± 0.002	0.100	0.115 ± 0.007	103.0
		2.431 ± 0.020	2.500	4.970 ± 0.008	101.6
-5	AsB	N.D.	0.500	0.499 ± 0.006	99.8
	AsC	N.D.	0.500	0.501 ± 0.003	100.2
		0.389 ± 0.014	0.500	0.872 ± 0.011	96.6
	DMA	0.563 ± 0.005	0.500	1.061 ± 0.021	99.6
	MMA	0.019 ± 0.004	0.100	0.114 ± 0.006	95.0
		2.302 ± 0.018	2.500	4.862 ± 0.029	102.4
-10	AsB	N.D.	0.500	0.489 ± 0.009	97.8
	AsC	N.D.	0.500	0.497 ± 0.005	99.4
		0.447 ± 0.006	0.500	0.952 ± 0.010	101.0
	DMA	0.534 ± 0.010	0.500	1.040 ± 0.004	101.2
	MMA	0.074 ± 0.009	0.100	0.169 ± 0.013	95.0
		2.057 ± 0.015	2.500	4.562 ± 0.004	100.2

The values are presented as average confidence interval (n = 3).
Not detectable.