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重铬酸钾容量法测定铁是一个准确、快速方法,至今仍在广泛应用。大宝山矿试验指出,铁量在14～56毫克之间,共滴定度差值按几何级数递减存在0.01常数关系,不能用理论值计算。奚干卿等取10～500毫克三氧化二铁测定,发现随着称样量增加,滴定度从小到大连续变化,只有在150～200毫克之间,才符合理论值。龚美菱等在引用该文时指出,为了获得正确的结果,不能用基准重铬酸钾标定铁,只能用近似含量的铁标定重铬酸钾,计算出重铬酸钾对铁的滴定度。这样就给不同品级试样分析造成不便。陈云湘等用回归分析法,计算出铁量与重铬酸钾标准溶液消耗量之间,有着明显的线性关系。
The determination of iron by the potassium dichromate volumetric method is an accurate and rapid method and is still widely used. The test of Da Baoshan Mine points out that the iron content is between 14 and 56 mg, and the difference of the total titration has a constant relationship of 0.01 by geometric progression, which can not be calculated by the theoretical value. Xi dry Qing and other 10 to 500 milligrams of ferric oxide determination and found that as the sample size increases, the titer changes continuously from small to large, only 150 to 200 mg, only in line with the theoretical value. Gong Meiling and others quoted the article pointed out that in order to obtain the correct result, can not use the standard potassium dichromate calibration iron, only approximate content of iron calibration potassium dichromate, calculated potassium dichromate iron titer . This gives different grades of sample analysis caused inconvenience. Chen Yunxiang and other regression analysis, calculate the amount of iron and potassium dichromate standard solution consumption, there is a clear linear relationship.