British Geological Survey, Environmental Science Centre, Nicker Hill, Keyworth, Nottingham NG12 5GG, UK.
British Geological Survey, Environmental Science Centre, Nicker Hill, Keyworth, Nottingham NG12 5GG, UK.
Environ Pollut. 2015 Dec;207:256-65. doi: 10.1016/j.envpol.2015.09.026. Epub 2015 Sep 25.
The relationship between As bioaccessibility using the physiologically based extraction test (PBET) and As extracted by hydroxylamine hydrochloride (HH), targeting the dissolution of amorphous Fe oxyhydroxides, is established in soils from the British Geological Survey Geochemical Baseline Survey of SW England, UK, to represent low As background and high As mineralised/mined soils. The HH-extracted As was of the same order of magnitude as the As extracted in the bioaccessibility test and proved to be a better estimate of bioaccessible As than total As (bioaccessible As - total As: r = 0.955; bioaccessible As - HH-extracted As: r = 0.974; p-values = 0.000). These results provide a means of estimating soil As bioaccessibility on the basis of the HH extraction. Further selective extraction data, using hydrochloride acid that seeks to dissolve both amorphous and crystalline Fe oxyhydroxides, indicates a decrease in the As bioaccessible fraction with the increase of the soil Fe oxyhydroxide crystallinity.
采用基于生理学的提取试验（PBET）测定的砷生物可给性与利用羟胺盐酸盐（HH）提取的砷之间的关系，在英国地质调查局英国西南部地球化学基线调查的土壤中建立，以代表低砷背景和高砷矿化/开采土壤。HH 提取的砷与生物可给性试验中提取的砷处于同一数量级，并且被证明是生物可给性砷的更好估计，而不是总砷（生物可给性砷 - 总砷：r = 0.955；生物可给性砷 - HH 提取的砷：r = 0.974；p 值均<0.000）。这些结果为基于 HH 提取来估计土壤砷生物可给性提供了一种方法。使用盐酸的进一步选择性提取数据，旨在溶解无定形和结晶铁氢氧化物，表明随着土壤铁氢氧化物结晶度的增加，砷的生物可给性分数降低。
