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在pH值为9.5～9.9的氨-氯化铵的缓冲溶液中,镍(Ⅱ)、铜(Ⅱ)、镉(Ⅱ)、钴(Ⅱ)、锌(Ⅱ)形成氨合络合物,而银(Ⅰ)、铋(Ⅲ)、铁(Ⅲ)、铁(Ⅱ)、汞(Ⅱ)、汞(Ⅰ)、锰(Ⅱ)、铅(Ⅱ)、锡(Ⅳ)、锡(Ⅱ)、钒(Ⅴ)、铝(Ⅲ)、钛(Ⅳ)等生成各种形式的沉淀。用甲醇-乙醇-氯化铵-氨-水体系(pH9.0～9.1),在硅胶H薄层板上,可以实现镍(Ⅱ)、铜(Ⅱ)、镉(Ⅱ)、钴(Ⅱ)、锌(Ⅱ)的分离。双硫腙显色后,用CS-930双波长薄层扫描仪测定含量。线性范围:锌0.01～0.20微克,铜0.01～0.25微克,镍、镉、钴0.01～0.30微克。
Nickel (Ⅱ), copper (Ⅱ), cadmium (Ⅱ), cobalt (Ⅱ) and zinc (Ⅱ) form ammonia complex in the buffer solution of ammonia-ammonium chloride with pH value of 9.5-9.9, Silver (Ⅰ), bismuth (Ⅲ), iron Ⅲ, iron Ⅱ, mercury Ⅱ, mercury Ⅰ, manganese Ⅱ, lead Ⅱ, tin Ⅳ, tin Ⅱ, Vanadium (Ⅴ), aluminum (Ⅲ), titanium (Ⅳ), etc. generate various forms of precipitation. Nickel (Ⅱ), copper (Ⅱ), cadmium (Ⅱ), cobalt (Ⅱ) can be achieved on silica gel thin layer by using methanol-ethanol-ammonium chloride- ammonia water system at pH 9.0 ~ 9.1. , Zinc (Ⅱ) separation. Dithizone color, using CS-930 dual wavelength TLC scanner to determine the content. Linear range: zinc 0.01 ~ 0.20 micrograms, copper 0.01 ~ 0.25 micrograms, nickel, cadmium, cobalt 0.01 ~ 0.30 micrograms.