论文部分内容阅读
金在地壳中的丰度很低,平均值为4ppb;具有工业开采价值的金矿,通常也只含有xppm的金,而且金在样品中的分布很不均匀。为了提高测定方法的灵敏度以及所取的样品具有足够的代表性,要求称取大量样品(10g以上),经预富集后再用各种方法测定。在预富集之前,样品必需进行分解。样品分解得好坏,直接影响测定的成败。目前通常应用的溶解方法仅局限于几种,当然这些方法是经历了生产考验而留存下来的,但是分解样品所需的时间较长,尚有不足之处。因此样品的分解已成为金的测定方法研究中的一个薄弱环节。本文旨在对现有的一些方法作一评价,有利于正确地使用它们;同时介绍近年来发表的几个新方法以及笔者的实践,为含金样品分解方法的改革者提供线索。
Gold has a very low abundance in the earth’s crust, with an average of 4 ppb; gold mined in industrial production often contains only xppm of gold, and the distribution of gold in the sample is not uniform. In order to improve the sensitivity of the determination method and the sufficient representativeness of the sample taken, a large amount of sample (10 g or more) is required to be weighed and then determined by various methods after pre-enrichment. Before pre-enrichment, the sample must be decomposed. Sample decomposition is good or bad, a direct impact on the success or failure of the determination. At present, the commonly used dissolution methods are limited to only a few, of course, these methods are experiencing the production test and survived, but the decomposition of the sample takes a long time, there are shortcomings. Therefore, the decomposition of the sample has become a weak link in the determination of gold. The purpose of this paper is to evaluate some existing methods and to use them correctly. Meanwhile, several new methods published in recent years as well as the author’s practice are introduced to provide clues for the reformers of gold-containing sample decomposition methods.