Determination of Chromium in Natural Water by Adsorptive Stripping Voltammetry Using In Situ Bismuth Film Electrode

Table 5

Determination of the accuracy of the SqW-AdSV/in situ BiFE on the NASS 6^a.

[NAAS 6]	The content of chromium in the sample (ppb) ×1	Chromium standard added (ppb)×o	The content of chromium in standard added samples (ppb) ×2	Recovery (%)
2 ppb	0.116	1.884	1.915	96
			2.043	102
			1.941	97
Average ± S			1.966 ± 0.054
6 ppb	0.116	5.884	5.958	99
			6.258	104
			5,655	94
Average ± S			5.957 ± 0.213
10 ppb	0.116	9.884	10.687	107
			10.125	101
			10.887	109
Average ± S			10.566 ± 0.279

^aRecovery = (x₂−x₁).·100/x₀; S is the standard deviation; experimental conditions are as shown in Table 3.