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首页> 外文期刊>Geochemistry: Exploration, Environment, Analysis >The design and application of sequential extractions for mercury, Part 1. Optimization of HNO3 extraction for all non-sulphide forms of Hg
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The design and application of sequential extractions for mercury, Part 1. Optimization of HNO3 extraction for all non-sulphide forms of Hg

机译：汞连续萃取的设计和应用，第1部分。所有非硫化物形式的Hg的HNO3萃取的优化

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摘要

The final step in a sequential extraction procedure for Hg in geological samples usually involves a strong acid attack such as aqua regia. It is assumed that the Hg component measured in this step represents HgS (cinnabar), the common and highly insoluble form of Hg in nature. This paper describes the optimization of an HNO3-based dissolution of all non-sulphide forms of Hg while minimizing the solubilization of HgS. Previous work indicated that 12M (75% v/v) HNO3 would fulfil that objective but its application in this work to samples containing very fine-grained HgS showed that this concentration was too strong as it partially dissolved HgS. Thus, HgS control samples were used to study the effect of HNO3 concentration, duration of extraction and sample-to-volume ratio on the chemical breakdown of HgS. The recommended procedure to separate HgS from other forms of Hg is a two-hour extraction of 1 g of sample in 20 ml of 40% HNO3 with constant agitation followed by a 10-ml rinse with 40% HNO3. This then ensures that all the cinnabar, fine- and coarse-grained, reports to the subsequent aqua regia step.
机译：对 地质样品中的Hg进行连续萃取的最后一步通常涉及强酸攻击，例如王水。假设在此步骤中测量的 中的Hg成分代表HgS（朱砂），这是自然界中常见的且高度 不溶的Hg。本文介绍了基于HNO 3 的Hg 的所有非硫化物溶解形式的优化 ，同时将HgS的溶解度降至最低。先前的工作表明 12M（75％v / v）HNO 3 可以实现该目标，但是它的 在这项工作中的应用非常适合-grained HgS表明该浓度过高，因为它部分 溶解了HgS。因此，使用HgS对照样品研究 HNO 3 浓度，提取持续时间和 样品对体积的比率对化学药品的影响。 HgS的分解。 推荐的将HgS与其他形式的Hg 分离的步骤是在20 ml 40％HNO 3 ，不断搅拌，然后用40％HNO 3 冲洗10毫升。 然后确保所有朱砂，细砂和粗砂-grained， 报告到随后的王水步骤。

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