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首页> 外文期刊>Environmental Science & Technology >Removal of methylated arsenic in groundwater with iron filings
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Removal of methylated arsenic in groundwater with iron filings

机译：铁屑去除地下水中的甲基化砷

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Field and laboratory experiments were conducted to study the potential use of Fe filings to remove monomethyl arsenate (MMA) and dimethyl arsenate (DMA) from contaminated waters. Batch experiments show that the affinity of MMA for Fe filings is comparable to that of inorganic arsenate, but lower than that for arsenite. In contrast, very little DMA was retained by Fe filings or their corrosion products. The wide range of affinities of different As species for Fe filings was confirmed by a series of retention and selective-leaching experiments using small columns and As-spiked groundwater. The effectiveness of Fe filings was also demonstrated with a field deployment at a U.S. Superfund site where groundwater is highly contaminated with both organic and inorganic As species. Over the course of 4 months, a 3 L cartridge of Fe filings removed > 85% of As contained in 16000 L of groundwater containing 1-1.5 mg/L total dissolved As, similar to 30% of which was organic As. The results indicate that Fe filings could be used to treat groundwater contaminated with MMA, which is the main organic form of As at most contaminated sites. Indications of partial demethylation in the column of Fe filings suggest conditions might be optimized further to enhance the removal of DMA.
机译：进行了现场和实验室实验，以研究铁屑在污染水体中去除砷酸单甲酯（MMA）和砷酸二甲酯（DMA）的潜在用途。分批实验表明，MMA对铁屑的亲和力与无机砷酸盐的亲和力相当，但低于对亚砷酸盐的亲和力。相比之下，铁屑或其腐蚀产物仅保留了很少的DMA。通过使用小柱和As掺加地下水的一系列保留和选择性浸出实验，证实了不同As物种对Fe的广泛亲和力。在美国超级基金所在地的现场部署中也证明了铁屑的有效性，该地点的地下水被有机和无机砷物种高度污染。在4个月的过程中，用3升铁屑盒清除了16000升地下水中所含的85％以上的砷，该地下水中总溶解砷为1-1.5 mg / L，其中有机砷含量为30％。结果表明，铁屑可用于处理被MMA污染的地下水，而MMA是大多数受污染场​​地中As的主要有机形式。 Fe申请栏中的部分脱甲基指示表明，可以进一步优化条件以提高DMA的去除率。

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