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以火焰原子化法测定银,一般常在强盐酸介质中进行,使银呈AgCl_4~3状态,便于测定。但此法对仪器侵蚀性较大。引入氯化钠或二乙烯三胺以有所益处,但溶液酸度仍在10％以上,而在火焰原子化系统中,测试溶液的酸度一般不宜超过5％。于氨性介质进行测定有其优点,但大量铁、锰的存在有干扰,结果偏低。采用银的硫代硫酸盐中性介质进行测定,条件较烦锁,且不易控制。我们试用硫脲络合银,在含有一定量铁盐存在的情况下,于低酸度介质中进行测定,取得良好效果。
Flame atomic determination of silver, usually in strong hydrochloric acid medium, the silver was AgCl_4 ~ 3 state, easy to determine. However, this method is more corrosive to the instrument. The introduction of sodium chloride or diethylenetriamine to benefit, but the solution acidity is still above 10%, while in the flame atomic system, the test solution acidity is generally not more than 5%. Determination of ammonia in the media has its advantages, but a large number of iron, manganese presence of interference, the result is low. The use of silver thiosulfate neutral medium for the determination of the conditions more difficult to lock, and not easy to control. We try thiourea complex silver, containing a certain amount of iron salt in the presence of low acidity medium for determination, and achieved good results.