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目前铬矿中铬的测定一般都采用碱熔法,手续烦杂,耗费较大,且在熔融,试样浸出及移液等过程中,易引起误差,经过试验,采用过硫酸铵、硫磷混合酸溶样体系对各种不同产地的铬矿矿样溶解均取得较好的效果。这给铬矿中铬的测定以很大的便利.方法简单、易于掌握,准确度、稳定性都很好. 一方法要点试样用过硫酸铵、硫磷混合酸溶解后,在10%～14%硫磷酸度下用高锰酸钾将Cr~(5+)氧化成六价,过量的高锰酸钾用氯化铵还原.六价铬以N-苯代邻氨基
At present, the determination of chromium in chrome ore is generally based on alkali melting method, the procedure is complicated and costly, and in the process of melting, sample leaching and pipetting, it is easy to cause error. After the experiment, the use of ammonium persulfate, Acid solution-like system for a variety of different origins of chromium ore samples were dissolved to achieve better results. This is a great convenience for the determination of chromium in chrome ore.The method is simple, easy to grasp, accuracy and stability are good.A method points sample with ammonium persulfate, phosphoric acid mixed acid dissolved in 10% Cr (5+) is oxidized to hexavalent by potassium permanganate under the condition of 14% thiophosphoric acid, and potassium permanganate is reduced with ammonium chloride in excess. Hexavalent chromium is treated with N-