活性炭吸附碘量法测金,如果样品中含铅量高,按常规分析,结果便会偏低.其原因,主要是在分析过滤时,部分铅离子被活性炭吸附,而在洗涤活性炭时,未被洗脱,残留在活性炭上的铅离子,在高温灰化时,被氧化成各种形式铅的氧化物.这些在灰化过程中形成的氧化铅,是油状沾结在瓷坩埚底部,把金包在里面.故引起结果偏低.实验证明,在同样条件分析时,铅含量越高,结果偏低越多. Activated carbon adsorption Iodometry gold, if the sample contains high levels of lead, according to conventional analysis, the result will be low.The reason is mainly in the analysis and filtration, part of the lead ion is activated carbon adsorption, and when washing activated carbon, not Lead ions, which are eluted and remain on the activated carbon, are oxidized into oxides of various forms of lead at high temperature ashing, and these lead oxides formed during the ashing process are oily and stick to the bottom of the porcelain crucible. Gold package in it, so the result is low. Experiments show that in the same conditions analysis, the higher the lead content, the result is low.