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金的分光光度法较多,常用方法的原理是根据Au Cl_4~-或Au Br_4~-与各种染料如孔雀绿、灿烂绿、结晶紫的反应。通过萃取分离测定,其效果较好,灵敏度能达到要求,并具有一定的选择性。但对于含锑试样(如铜阳极泥系统的试样),由于SbCl_6~-也与该类试剂形成有色络合物而萃入有机相,严重地干扰了金的测定,故不能直接使用该类方法,需在测定之前预先进行分离富集。有关锑干扰的问题,通常采用火试金富集和分离,碲共沉淀,硒共沉淀,活性炭吸附以及用N—亚硝基萘胲腙(R)试剂选择性萃取金的方法以消除锑的干扰。也有人提出,直接将分取的试液于瓷坩埚内蒸干,并于850℃灼烧30分钟,从而消除Hg、Sb、Tl的干扰,并指出少量的Hg与Sb在盐酸蒸干时,均能挥发除尽,不
Gold spectrophotometry more commonly used method is based on the principle of Au Cl_4 ~ - or Au Br_4 ~ - and a variety of dyes such as malachite green, brilliant green, crystal violet reaction. Through the extraction and separation of determination, the effect is better, the sensitivity can meet the requirements, and has a certain selectivity. However, for samples containing antimony (such as copper anode slime system), since SbCl_6 ~ also forms a colored complex with these reagents to extract the organic phase, seriously interfering with the determination of gold, it can not be used directly Class method, the determination of the need for pre-separation and enrichment. For antimony interference problems, the methods of enrichment and separation of fire test gold, coprecipitation of tellurium, coprecipitation of selenium, adsorption of active carbon and selective gold extraction with N-nitroso naphthyl hydrazone (R) reagent are usually used to eliminate the problem of antimony interference. It was also suggested that the direct separation of the test solution was evaporated in a porcelain crucible and fired at 850 ° C for 30 minutes to eliminate the interference of Hg, Sb, Tl and pointed out that a small amount of Hg and Sb evaporated in hydrochloric acid, All can be volatile, not