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. Author manuscript; available in PMC: 2009 Nov 1.
Published in final edited form as: Appl Geochem. 2008 Nov;23(11):3019–3028. doi: 10.1016/j.apgeochem.2008.07.005

Table 2.

Average ratio of P-extractable to HCl-extractable As concentrations in aquifer particles collected with the needle-sampler in 4 countries. Also shown are the corresponding standard deviations in this ratio for each country along with, in parentheses, the uncertainty of the mean calculated by dividing by the square root of the number of determinations. Only sufficiently reducing intervals defined by leachable Fe(II)/Fe >0.5 or dissolved As>10 μg/L if dissolved Fe <0.2 mg/L are included.

Country P-extr. As/HCl-extr. As n Reference
Bangladesh 0.5±0.3 (±0.07) 21 van Geen et al., 2008
India 0.4±0.3 (±0.05) 33 Métral et al., 2008
Vietnam 1.0±0.3 (±0.06) 22 this study
Nepal 1.0±0.5 (±0.2) 7 this study