The effects of application of two anions commonly found in subsurface environments, phosphate (PO43-) and sulfate (SO42-), on hexavalent chromium (Cr(VI)) uptake and translocation by Zea mays, were investigated using pot-culture experiments. The two anions were tested as potential agents to mobilize Cr(VI) from polluted soil (50, 75 and 100 mg kg-1 dw) at a dose of 16.7 mmol kg-1. Metal uptake from soil to roots and subsequent transfer to shoots was discussed in terms of bioconcentration factor (BCF) and translocation factor (TF). The overall order of BCFs and TFs which resulted from this study was: PO43- > H2O > SO42-; in the same time, metal concentration in plants tissues decreased in the order: root > stem > leaf. The present study suggests that PO43- may be used as an environmentally compatible alternative to non-biodegradable synthetic chelants, to enhance the efficiency of Cr(VI) phytoextraction with Z. mays.

译文

使用盆栽实验研究了在地下环境中常见的两种阴离子磷酸盐 (PO43-) 和硫酸盐 (SO42-) 对玉米吸收和转运六价铬 (Cr(VI)) 的影响。测试了这两种阴离子作为潜在的试剂,以16.7 mmol kg-1的剂量从污染的土壤 (50,75和100 mg kg-1 dw) 中动员Cr(VI)。根据生物浓缩因子 (BCF) 和易位因子 (TF) 讨论了金属从土壤到根部的吸收以及随后向芽的转移。本研究产生的bcf和TFs的总体顺序为: PO43- > H2O > SO42-; 同时,植物组织中的金属浓度按以下顺序降低: 根> 茎> 叶。本研究表明,PO43-可以用作不可生物降解的合成螯合剂的环境相容性替代品,以提高Z. mays提取Cr(VI) 植物的效率。

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