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地质样品中微量银的测定,目前多采用溶剂萃取,或者直接在HCl、HCl加NH_4Cl、氨水或硫脲等介质中用原子吸收法测定。实践证明,上述方法各有弊端。如萃取方法的溶剂易挥发和毒化环境,用于日常分析有困难,较浓HCl腐蚀燃烧器;NH_4Cl因盐析而阻塞喷咀和燃烧器,影响试液的恒定提升和火焰形状,在氨水介质中产生氢氧化物沉淀而吸附银;硫脲与铜离子产生沉淀干扰银的
Determination of trace silver in geological samples, the current use of solvent extraction, or directly in the HCl, HCl and NH_4Cl, ammonia or thiourea and other media by atomic absorption spectrometry. Practice has proved that the above methods have their own drawbacks. Such as the extraction method of volatile solvents and poisoning environment for routine analysis of difficult, more concentrated HCl corrosion burner; NH_4Cl due to salinization and blocked nozzle and burner, affecting the constant test solution and flame shape in ammonia medium In the production of hydroxide precipitation and adsorption of silver; Thiourea and copper ions produce precipitation interference silver