...
首页> 外文期刊>International journal of environmental analytical chemistry >Speciation of arsenic(III) and arsenic(V) by manganese-mediated stripping voltammetry at gold microelectrode ensemble in neutral and basic medium
【24h】

Speciation of arsenic(III) and arsenic(V) by manganese-mediated stripping voltammetry at gold microelectrode ensemble in neutral and basic medium

机译:锰介导溶出伏安法在中性和碱性介质中金微电极集合体上测定砷(III)和砷(V)的形态

获取原文
获取原文并翻译 | 示例
           

摘要

New schemes of arsenic speciation by anodic stripping voltammetry are developed at neutral pH based on the difference in electrochemical behaviour of the As(III) and As(V) forms. Detection is performed in sulphite medium (0.1M Na2SO3) in the presence of Mn(II) (10(-)(6)M), which is known to catalyse the reduction of As(V), making it detectable by ASV. Two speciation schemes are proposed. If As(III)>As(V), then As(III) and total As(III)+As(V) are determined in separate voltammetric cells after oxidation of As(III) to As(V) (5min ozone purging), similar to previous studies. However, when As(V)>As(III), both As(III) and As(V) can be determined consecutively, within the same cell. In this case, two simple variants were successfully tested, depending on the size of the As(III) peak in comparison to the linearity range. The working electrode is an ensemble of gold microelectrodes obtained by HAuCl4 electrolysis at a carbon black-polyethylene composite (ratio 30:70). No purging is required, the electrode is sensitive, robust and has a long lifetime. Calculated LODs of As(III) and As(V) are 0.09 mu gL(-)(1) and 0.35 mu gL(-)(1), respectively (3 sigma, t(dep)=20s). The proposed procedures are fast, simple and environmental-friendly.
机译:基于As(III)和As(V)形式的电化学行为差异,在中性pH下开发了通过阳极溶出伏安法测定砷形态的新方案。检测是在亚硫酸盐介质(0.1M Na2SO3)中,在存在Mn(II)(10(-)(6)M)的条件下进行的,Mn(II)催化As(V)的还原,因此可通过ASV检测。提出了两种物种形成方案。如果As(III)> As(V),则在将As(III)氧化为As(V)(5分钟臭氧吹扫)后,在单独的伏安电池中确定As(III)和总As(III)+ As(V)。 ,类似于先前的研究。但是,当As(V)> As(III)时,可以在同一单元格内连续确定As(III)和As(V)。在这种情况下,根据与线性范围相比As(III)峰的大小,成功测试了两个简单的变体。工作电极是通过HAuCl4在炭黑-聚乙烯复合材料(比例30:70)下电解获得的金微电极的集合体。无需吹扫,电极灵敏,坚固且使用寿命长。 As(III)和As(V)的计算LOD分别为0.09μgL(-)(1)和0.35μgL(-)(1)(3 sigma,t(dep)= 20s)。所提出的程序是快速,简单和环境友好的。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号