Accumulation and bioavailability of copper and nickel in wheat plants grown in contaminated soils from the oasis, northwest China
Accumulation and bioavailability of copper and nickel in wheat plants grown in contaminated soils from the oasis, northwest China
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DOI：
10.1016/j.geoderma.2009.06.012
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发表时间：
2009-09
期刊：
影响因子：
6.1
通讯作者：
Shengli Wang;Z. Nan;Xiaowen Liu;Yuan Li;Song Qin;Hai-Mai Ding
中科院分区：
文献类型：
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作者：
Shengli Wang;Z. Nan;Xiaowen Liu;Yuan Li;Song Qin;Hai-Mai Ding
本文研究了在西北绿洲污染土壤中生长的小麦植株铜、镍的积累和生物有效性。研究土壤中Cu和Ni的浓度均超过了中国土壤环境质量二级标准的Cu和Ni限值；S5土壤中Cu和S1、S3、S5、S6土壤中Ni的浓度均超过了中国土壤环境质量三级标准。在8种萃取剂中，土壤中可萃取铜的浓度一般为EDTA >柠檬酸> NH4Ac > NH4NO3> MgCl2≈酒石酸>乙酸>草酸。Ni的萃取量为：柠檬酸> EDTA > NH4Ac >酒石酸> NH4NO3≈乙酸≈草酸> MgCl2。小麦植株各部位Ni平均浓度的排列顺序为根、叶、壳、木、茎、粒；不同部位铜平均浓度的排列顺序为根、叶、壳、粒、砧木、>。研究的土壤不适合种植供人类食用的小麦作物；所研究的土壤通过食物链对人类健康构成高度潜在的健康风险。Cu在小麦植株各部位的平均生物富集因子（BCF）和转运因子（TF）均大于Ni。绿洲土壤中有效铜和镍的含量、土壤的理化参数以及小麦不同部位对铜和镍的吸收和积累过程可能与绿洲土壤中有效铜和镍的含量有关。在9种评价方法中，柠檬酸和NH4Ac萃取法对铜的生物利用度有较好的指示作用。
This paper studied the accumulation and bioavailability of copper and nickel in wheat plants grown in contaminated soils from the oasis, northwest China. The concentrations of Cu and Ni in studied soils were all more than Cu and Ni limit of grade II soil environmental quality standards in China; furthermore the concentration of Cu in soil S5 and the concentrations of Ni in soil S1, S3, S5, and S6 exceeded grade III soil environmental quality standards in China. Among eight extractants, the extractable Cu concentrations in soils generally followed the descending order EDTA > Citric acid > NH4Ac > NH4NO3> MgCl2≈ Tartaric acid > Acetic acid > Oxalic acid. The extraction capacity of Ni was as follow: Citric acid > EDTA > NH4Ac > tartaric acid > NH4NO3≈ Acetic acid ≈ Oxalic acid > MgCl2. The sequences of Ni average concentrations in different parts of the wheat plant were roots > leaves > shells > stocks > grains; the sequences of Cu average concentrations in different parts were also roots > leaves > shells > grains > stocks. Soil studied is not fit to plant the wheat crops for human consumption; soils studied posed high potential health risk for human health through food chains. Average Bio-concentration factor (BCF) and translocation factor (TF) of Cu in different parts of wheat plants were greater than those of Ni. The process of Cu and Ni uptake and accumulation by wheat plants were probably linked to the concentrations of available copper and nickel in the oasis soils, physical and chemical parameters of soils, and different parts of wheat plants. Citric acid and NH4Ac extraction procedures provided a good indication of Cu bioavailability among nine kinds of evaluation methods.