Effects of the FeII/CuII interaction on copper aging enhancement and pentachlorophenol reductive transformation in paddy soil.
Effects of the FeII/CuII interaction on copper aging enhancement and pentachlorophenol reductive transformation in paddy soil.
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DOI：
10.1021/jf2040093
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发表时间：
2012-01
影响因子：
6.1
通讯作者：
Yong-kui Wang;Liang Tao;Man-jia Chen;Fangbai Li
中科院分区：
文献类型：
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作者：
Yong-kui Wang;Liang Tao;Man-jia Chen;Fangbai Li
研究了Fe（II）/Cu（II）交互作用下南方水稻土中铜的老化和五氯酚（PCP）的还原转化。动力学测量表明，五氯苯酚还原转化率（k）可以促进在不超过0.375 mM的Cu（II）的存在下，抑制在不低于0.5 mM的Cu（II）的存在下。在0.25 mM Cu（II）存在下的最高k值对应于活性Fe物种的最低氧化还原电位（E（p））值。活性铁物种E（p）的增加趋势与五氯苯酚还原k值的下降趋势一致，反之亦然。在PCP还原过程中，溶解态Cu（II）逐渐转化为固定态Cu（II），表明Fe（II）/Cu（II）相互作用促进了Cu的老化。这些研究结果提高了我们对Fe（II）/Cu（II）相互作用对土壤铁氧化还原化学多氯农药解毒和重金属固定的一般理解。
The present study investigated copper aging and pentachlorophenol (PCP) reductive transformation under the effects of the Fe(II)/Cu(II) interaction in paddy soil in south China. Kinetic measurements demonstrated that the PCP reductive transformation rate (k) could be promoted in the presence of no more than 0.375 mM Cu(II) and inhibited in the presence of no less than 0.5 mM Cu(II). The highest k value in the presence of 0.25 mM Cu(II) corresponds to the lowest redox potential (E(p)) value of active Fe species. The increasing trend in E(p) of the active Fe species is consistent with the declining trend in the k value of PCP reduction and vice versa. Dissolved Cu(II) is gradually transformed into immobilized Cu species during PCP reduction, which indicates that Cu aging is enhanced by the Fe(II)/Cu(II) interaction. These findings improve our general understanding of the Fe(II)/Cu(II) interaction on soil iron redox chemistry for polychlorinated pesticide detoxification and heavy metal immobilization.