Occurrence and speciation of polymeric chromium(III), monomeric chromium(III) and chromium(VI) in environmental samples.
Occurrence and speciation of polymeric chromium(III), monomeric chromium(III) and chromium(VI) in environmental samples.
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DOI：
10.1016/j.chemosphere.2016.04.100
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发表时间：
2016-08
期刊：
影响因子：
8.8
通讯作者：
Jiang G
中科院分区：
文献类型：
--
作者：
Hu L;Cai Y;Jiang G
实验室实验表明，聚合物铬(III)在水溶液中可以存在较长一段时间。然而，由于缺乏形成聚合物铬的方法，环境介质中聚合物铬(III)的存在尚未见报道。在对含铬砷酸铜(CCA)处理木材渗滤液中铬形态的研究过程中，观察到一种未知的铬形态。对未知铬物种的结构进行了鉴定。考虑到CCA处理木材中铬的存在形式，我们主要致力于确定未知形态是聚合铬(III)、铬/砷的络合物还是铬与溶解有机物(DOM)的络合物。为了评估木材渗滤液中是否存在大量的聚合物铬(III)，采用高效液相色谱-电感耦合质谱仪(HPLCICPMS)同时测定了单体铬(III)、聚合物铬(III)和铬(VI)的形态。除了木材渗滤液中的聚合铬(III)含量在39.1%到67.4%之间外，还调查了其他环境基质中未知形态铬的存在，包括地表水、自来水和废水。结果表明，含μg/L级铬的环境样品中可能存在聚合铬，其含量高达总铬的60%，说明自然环境中可能存在大量的聚合铬。如果不能定量测定聚合铬(III)，将导致对总铬的低估和铬形态的偏差。环境中存在聚合铬(III)物种的环境影响值得进一步研究。
Laboratory experiments suggest that polymeric Cr(III) could exist in aqueous solution for a relative long period of time. However, the occurrence of polymeric Cr(III) has not been reported in environmental media due partially to the lack of method for speciating polymeric Cr. We observed an unknown Cr species during the course of study on speciation of Cr in the leachates of chromated-copper-arsenate (CCA)-treated wood. Efforts were made to identify structure of the unknown Cr species. Considering the forms of Cr existed in the CCA-treated woods, we mainly focused our efforts to determine if the unknown species were polymeric Cr(III), complex of Cr/As or complex of Cr with dissolved organic matter (DOM). In order to evaluate whether polymeric Cr(III) largely exist in wood leachates, high performance liquid chromatography coupled with inductively coupled mass spectrometry (HPLC-ICPMS was used) for simultaneous speciation of monomeric Cr(III), polymeric Cr(III), and Cr(VI). In addition to wood leachates where polymeric Cr (III) ranged from 39.1 to 67.4 %, occurrence of the unknown Cr species in other environmental matrices, including surface waters, tap and waste waters, was also investigated. It was found that polymeric Cr(III) could exist in environmental samples containing μg/L level of Cr, at a level up to 60% of total Cr, suggesting that polymeric Cr(III) could significantly exist in natural environments. Failure in quantifying polymeric Cr(III) would lead to the underestimation of total Cr and bias in Cr speciation. The environmental implication of the presence of polymeric Cr(III) species in the environment deserves further study.
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影响因子：
8.9
作者：
Hasan, A. Rasem;Hu, Ligang;Solo-Gabriele, Helena M.;Fieber, Lynne;Cai, Yong;Townsend, Timothy G.
通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
8.8
作者：
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通讯作者：
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影响因子：
8.8
作者：
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通讯作者：
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影响因子：
8.8
作者：
Hu L;Greer JB;Solo-Gabriele H;Fieber LA;Cai Y
通讯作者：
Cai Y