Civil and geo-Environmental Engineering Laboratory (LGCgE), ISA Lille, 48 boulevard Vauban, 59046 Lille cedex, France.
Civil and geo-Environmental Engineering Laboratory (LGCgE), ISA Lille, 48 boulevard Vauban, 59046 Lille cedex, France.
J Environ Sci (China). 2016 Sep;47:183-192. doi: 10.1016/j.jes.2015.12.028. Epub 2016 Mar 18.
An initial exploration was conducted using mathematical and statistical methods to obtain relevant information about the determination of the physicochemical parameters capable of controlling As uptake by ryegrass grown on contaminated topsoils. Concentrations of As in the soils were from 10 to 47mg/kg, mainly in the As(V) form (57%-73%). Concentrations of As in water extracts were very low (61-700μg/kg). It was suggested that As(III) was mainly in the uncharged species and As(V) in the charged species. Chemometric methods revealed that the values of the ratio As(III)/As(V) depended on the assimilated-phosphorus, the pseudo-total and water-extractable Fe contents and the soil pH. Arsenic concentrations measured in ryegrass shoots ranged from 119 to 1602μg/kg. Positive linear correlations were obtained between As in ryegrass shoots and water extractable-As. The transfer coefficient of As correlated well with the ratio assimilated-phosphorus/Fe-oxides. As(III) uptake by the shoot of ryegrass was controlled by the organic matter and Fe-oxide contents.
采用数学和统计学方法对受污染表层土壤上黑麦草吸收砷的理化参数进行了初步研究，得到了相关信息。土壤中砷的浓度为 10-47mg/kg，主要以砷（V）的形式存在（57%-73%）。水提物中砷的浓度非常低（61-700μg/kg）。研究表明，砷（III）主要以非离子态存在，砷（V）主要以离子态存在。化学计量学方法表明，砷（III）/砷（V）比值取决于可同化磷、假总铁和水可提取铁含量以及土壤 pH 值。黑麦草地上部分的砷浓度范围为 119-1602μg/kg。黑麦草地上部分的砷含量与水可提取的砷含量之间存在正线性相关性。砷的迁移系数与可同化磷/铁氧化物的比值密切相关。黑麦草地上部分对砷（III）的吸收受有机质和铁氧化物含量的控制。
