Effect of drying on heavy metal fraction distribution in rice paddy soil.
Effect of drying on heavy metal fraction distribution in rice paddy soil.
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DOI：
10.1371/journal.pone.0097327
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Darilek JL
中科院分区：
文献类型：
--
作者：
Qi Y;Huang B;Darilek JL
了解氧化还原条件如何影响稻田土壤重金属组分是重要的，因为它的影响，重金属的流动性和植物吸收。水稻土样品在进行重金属分析之前通常进行氧化。研究了pH范围较宽的水稻土中Cu、Pb、Ni、Cd的形态分布。根据标准方案干燥样品，并通过采样和分析过程在厌氧条件下保存，然后依次提取可交换和碳酸盐结合部分（酸溶性部分），铁和锰氧化物结合部分（可还原部分），有机结合部分（可氧化部分）和残留部分的重金属。在所有pH范围内，馏分受氧化还原条件的影响。干燥降低了所有重金属的可还原部分。Cu残留分数、Pb可氧化分数、Cd残留分数和Ni残留分数分别增加25%、33%、35%和> 60%。Pb残留量、Ni酸溶量和Cd可氧化量分别下降33%、25%和15%。干燥水稻土重金属分析前高估铅和低估铜，镍，镉。在未来的研究中，样品应储存后注入N2气体，以保持土壤的氧化还原电位之前，重金属分析，并调查重金属形态分布在现场条件下，空气干燥的样品之间的相关性。
An understanding of how redox conditions affect soil heavy metal fractions in rice paddies is important due to its implications for heavy metal mobility and plant uptake. Rice paddy soil samples routinely undergo oxidation prior to heavy metal analysis. Fraction distribution of Cu, Pb, Ni, and Cd from paddy soil with a wide pH range was investigated. Samples were both dried according to standard protocols and also preserved under anaerobic conditions through the sampling and analysis process and heavy metals were then sequentially extracted for the exchangeable and carbonate bound fraction (acid soluble fraction), iron and manganese oxide bound fraction (reducible fraction), organic bound fraction (oxidizable fraction), and residual fraction. Fractions were affected by redox conditions across all pH ranges. Drying decreased reducible fraction of all heavy metals. Curesidual fraction, Pboxidizable fraction, Cdresidual fraction, and Niresidual fraction increased by 25%, 33%, 35%, and >60%, respectively. Pbresidual fraction, Niacid soluble fraction, and Cdoxidizable fraction decreased 33%, 25%, and 15%, respectively. Drying paddy soil prior to heavy metal analysis overestimated Pb and underestimated Cu, Ni, and Cd. In future studies, samples should be stored after injecting N2 gas to maintain the redox potential of soil prior to heavy metal analysis, and investigate the correlation between heavy metal fraction distribution under field conditions and air-dried samples.
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影响因子：
3.1
作者：
Kashem, MA;Singh, BR
通讯作者：
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影响因子：
4.3
作者：
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影响因子：
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作者：
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6.8
作者：
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通讯作者：
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影响因子：
8.9
作者：
Andreu, V;Gimeno-García, E
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Gimeno-García, E