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首页> 外文期刊>Environmental Geochemistry and Health >In-situ electrochemical measurements of total concentration and speciation of heavy metals in acid mine drainage (AMD): assessment of the use of anodic stripping voltammetry
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In-situ electrochemical measurements of total concentration and speciation of heavy metals in acid mine drainage (AMD): assessment of the use of anodic stripping voltammetry

机译：酸性矿山排水（AMD）中重金属总浓度和形态的原位电化学测量：阳极溶出伏安法的使用评估

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摘要

We assessed the use of anodic stripping voltammetry (ASV) for in-situ determinations of both total concentration and speciation of dissolved heavy metals (Cd, Cu, Pb and Zn) in acid mine drainage (AMD). In the Kwangyang Au-Ag mine area of South Korea, different sites with varying water chemistry within an AMD were studied with a field portable anodic stripping voltammeter. Anodic stripping voltammetry after wet oxidation (acidification) was very sensitive enough to determine total concentration of dissolved Cd because Cd was dominantly present as 'labile' species, whilst the technique was not so effective for determining total Cu especially in the downstream sites from the retention pond, due to its complexation with organic matter. For dissolved Pb, the concentrations determined by ASV after wet oxidation generally agreed with those by ICP-AES. In the downstream samples (pH > 5), however, ASV data after wet oxidation were lower than ICP-AES data because a significant fraction of dissolved Pb was present in those samples as 'inert' species associated with colloidal iron oxide particles. The determination of total dissolved Zn by ASV after wet oxidation appeared to be unsatisfactory for the samples with high Cu content, possibly due to the interference by the formation of Zn-Cu intermetallic compounds on the mercury coated electrode. In AMD samples with high dissolved iron, use of ultraviolet irradiation was not effective for determining total concentrations because humate destruction by UV irradiation possibly resulted in the removal of a part of dissolved heavy metals from waters through the precipitation of iron hydroxides.
机译：我们评估了使用阳极溶出伏安法（ASV）来现场测定酸性矿山排水（AMD）中溶解的重金属（Cd，Cu，Pb和Zn）的总浓度和形态。在韩国的Kwangyang Au-Ag矿区，使用现场便携式阳极溶出伏安法研究了AMD中不同化学成分的不同地点。湿法氧化（酸化）后的阳极溶出伏安法非常灵敏，足以确定溶解的Cd的总浓度，因为Cd主要以“不稳定”物质的形式存在，而该技术对总Cu的测定不是那么有效，尤其是从保留物中的下游位置池塘，因为它与有机物络合。对于溶解的Pb，通过湿氧化后ASV测定的浓度通常与ICP-AES一致。然而，在下游样品（pH> 5）中，湿法氧化后的ASV数据低于ICP-AES数据，因为这些样品中有很大一部分溶解的Pb是与胶态氧化铁颗粒相关的“惰性”物质。湿氧化后，通过ASV测定总溶解的Zn对于含铜量高的样品似乎不能令人满意，这可能是由于在汞涂覆电极上形成Zn-Cu金属间化合物而产生的干扰。在具有高溶解铁的AMD样品中，使用紫外线辐照无法确定总浓度，因为紫外线辐照破坏腐殖酸盐可能会导致氢氧化铁的沉淀从水中除去一部分溶解的重金属。

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