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二苯基碳酰二肼吸收光度法测定钢中铬是人们所熟知的方法,但是有干扰元素存在或含铬很低的场合,常常遇到困难。我们试验了用甲基异丁基甲酮、铜铁试剂-三氯甲烷和铜试剂锌-三氯甲烷萃取分离铁、钒、钼、钛、铜等干扰元素,以二苯基碳酰二肼吸收光度法测定纯铁及钢中铬的方法,收到了较好效果。该方法用于测定纯铁及钢中0.001—0.5％的铬,常见量的上述元素无干扰,对含铬0.053％的标准样品12次重复测量的均方误差为±0.00043％。
Diphenylcarbodihydrazide absorption spectrophotometric determination of chromium in steel is a well-known method, but often encountered difficulties in the presence of interfering elements or low levels of chromium. We tested the use of methyl isobutyl ketone, copper and iron reagent - chloroform and copper reagent zinc - chloroform extraction of iron, vanadium, molybdenum, titanium, copper and other interfering elements to diphenylcarbazide absorbance Method of determination of pure iron and steel chromium, received good results. The method was applied to the determination of chromium in the range of 0.001-0.5% of pure iron and steel. The common elements of the above elements showed no interference. The mean square error of 12 repeated measurements of standard samples containing 0.053% chromium was ± 0.00043%.