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首页> 外文期刊>Talanta: The International Journal of Pure and Applied Analytical Chemistry >Determination of gold and silver in geological samples by focused infrared digestion: A re-investigation of aqua regia digestion
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Determination of gold and silver in geological samples by focused infrared digestion: A re-investigation of aqua regia digestion

机译：聚焦红外消解法测定地质样品中的金和银：王水消解法的再研究

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Focused infrared radiation-based digestions, for the determination of gold and silver, can be achieved in a timeframe as short as 10-15 min, making it an attractive candidate technology for the mining industry, where very large numbers of samples are analyzed on a daily basis. An investigation was carried out into gold and silver dissolution chemistry from geological samples using this novel digestion technique. This study investigated in-depth the issue of low recoveries of gold from aqua regia (AR) digestions, reported by a number of researchers. Conventional AR digestions consistently delivered gold recoveries in a range of 69-80% of the certified values for the four certified reference materials (CRM) employed (CCU-1d, SN26, OREAS 62c, and AMiS 0274), while silver recoveries were satisfactory. By gradually shifting the HCl:HNO3 ratio (v/v) from 3:1 to a reversed 1:3 ratio, recoveries of gold and silver exhibited inverse trends. At a HCl:HNO3 ratio of 1:3, complete recovery of gold was achieved with excellent reproducibility in all CRMs. Meanwhile, silver recoveries plunged significantly at this ratio in samples with higher silver concentrations. Silver values were recovered, however, when the silver was re-solubilized by adding a small volume of concentrated HCl to the cooled reverse aqua regia digests. Recoveries of base metals, such as Fe and Cu, were satisfactory throughout and were much less sensitive to changes in the digestion medium. Using four CRMs and five real-world gold/silver containing samples, the utility of the proposed reverse aqua regia was systematically studied. The uncomplicated nature of the digestion methods reported here, that are fast, effective and inexpensive, may be useful to analysts developing/optimizing their methods for the rapid determination of Au and Ag in a variety of mineral phases, particularly where rapid results are desirable, such as in prospecting and mine development. (C) 2015 Elsevier B.V. All rights reserved.
机译：集中的基于红外辐射的消解（用于测定金和银）可以在短短的10至15分钟的时间内完成，这使其成为采矿业的有吸引力的候选技术，因为在采矿业中可以对大量样品进行分析每天使用这种新的消解技术，对地质样品中的金和银的溶解化学进行了研究。这项研究深入研究了王水（AR）消化液中金的回收率低的问题，这是由许多研究人员报道的。常规的AR消解法能够始终如一地提供所使用的四种认证参考物质（CRM）（CCU-1d，SN26，OREAS 62c和AMiS 0274）的金回收率，为标准值的69-80％，而银的回收率令人满意。通过将HCl：HNO3的比例（v / v）从3：1逐渐改变为反向的1：3，金和银的回收率呈现相反的趋势。在HCl：HNO3的比例为1：3的情况下，金的完整回收率在所有CRM中均具有出色的可重复性。同时，在银含量较高的样品中，银的回收率以该比例显着下降。但是，当通过向冷却的反向王水消化液中加入少量浓HCl重新溶解银时，可以回收银值。铁和铜等贱金属的回收率总体上令人满意，并且对消化介质的变化不那么敏感。使用四个CRM和五个现实世界中包含的金/银样本，系统研究了所提出的反向王水的实用性。快速，有效和廉价的此处报道的消化方法的简单性质，对于分析人员开发/优化快速测定各种矿物相中Au和Ag的方法可能有用，特别是在需要快速结果的地方，例如在勘探和矿山开发中。 （C）2015 Elsevier B.V.保留所有权利。

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