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三价铬的毒性虽然小于六价铬,但在自然界的氧化条件下,还会引起第二次污染。目前,在环境分析方面,国内外文献报导的分析方法,都是采用间接方法。这种方法在三价铬含量高时,或者铁、矾、汞、锡等元素含量高时,直接影响三价铬的测定。 本文试图用纸上层析方法将三价铬固定到原点,剪下后用10％H_2SO_4溶解,用0.1％KM_nO_4氧化至六价铬,然后用二苯氨基脲显色。测定范围是0.5μg～100μg。它不仅克服间接法的上述缺点,而且具有简便、经济和准确度高等特点。分析方法如下:
Although the toxicity of trivalent chromium is less than hexavalent chromium, but in the natural conditions of oxidation, but also cause a second pollution. At present, in the field of environmental analysis, the methods of analysis reported in the literature both at home and abroad use indirect methods. This method in the high content of trivalent chromium, or iron, alum, mercury, tin and other elements directly affect the determination of trivalent chromium. In this paper, try to use paper chromatography to fix the trivalent chromium to the origin, cut it and dissolve it with 10% H 2 SO 4, then oxidize it to hexavalent chromium with 0.1% KM_nO 4 and then color with diphenhydramine. The measurement range is 0.5μg ~ 100μg. It not only overcomes the above shortcomings of the indirect method, but also has the characteristics of simplicity, economy and accuracy. The analysis method is as follows: