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Huan Jing Ke Xue. 2013 Jan;34(1):308-14.

[Chemical extraction of arsenic co-precipitated with amorphous Fe (OH)3 and Fe3O4].

[Article in Chinese]

Author information

1
Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China. chenyiping020217@163.com

Abstract

The mobility and bioavailability of As combining with amorphous Fe oxides is vulnerable to the environment. In order to figure out the specific effects of ageing time, Fe/As molar ratio and extractant-to-solid ratio on As extraction procedure, we chose 1 mol x L(-1) hydrochloride acid and 0.2 mol x L(-1) ammonium oxalate/oxalic acid as extractants to extract synthetic Fe (OH)3-As and Fe3O4-As co-precipitates. The results showed that: (1) During the extraction of Fe(OH) 3-As and Fe3O4-As co-precipitates by 1 mol x L(-1) hydrochloride acid, extractant-to-solid ratio should be 50 and 200, respectively; while extracted by 0.2 mol x L(-1) ammonium oxalate/oxalic acid, the molar ratio of C2O4(2-) to Fe in Fe(OH)3 and Fe3O4 solid phases should be 4 and 2.5, (2) The extraction time conducted by hydrochloride acid and ammonium oxalate/oxalic acid should be within 2 hours. (3) The Fe-to-As molar ratio and ageing at room temperature had a little influence on the extraction of Fe(OH)3-As co-precipitation, but significantly influenced on Fe3O4-As co-precipitation. With increase of the Fe/As molar ratio and extension of the ageing time, the Fe3O4-As co-precipitate became more difficult to be dissolved. (4) It was worth noting that, As would be re-adsorpted by the insoluble solid phase during the extraction by hydrochloride acid and ammonium oxalate/oxalic acid. So the inaccurate measurement would emerge during the extraction of As combining with amorphous Fe oxides.

PMID:
23487956
[Indexed for MEDLINE]
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