在比色分析的试液中,除被测定组份显色外,常存在各种干扰物质本身的颜色。如测定有色金属矿石、铜合金、镍电解槽中的杂质时,存在铜、铁、钴、镍、铬等有色离子的干扰。当测定有机物溶液中的金属杂质时,存在有机物本身黑褐色的干扰。按照常用的方法,需将这种有色离子分离,或加掩蔽剂结合为无色铬合物。或用萃取剂将测定组份从有色溶液中萃取分离。也有在测定标准曲线时加入同量干扰组份。有机物的颜色通常用硫酸消化方法将有机物破坏。所有应用以上这些方法,手续麻烦,费时间和试剂。本文研究对发色剂不起作用的本身有色干扰物质,选用适当的测量波长及用减 In the colorimetric analysis of the test solution, in addition to the measured component color, often there is a variety of interfering substances themselves. Such as the determination of non-ferrous metal ores, copper alloys, nickel electrolytic cell impurities, the existence of copper, iron, cobalt, nickel, chromium and other colored ions interference. When determining the metal impurities in the organic solution, there is interference of the organic itself dark brown. In accordance with the commonly used method, the colored ions need to be separated, or combined with masking agents as colorless chrome compounds. Alternatively, extract the assay components from the colored solution using an extraction reagent. Also in the determination of the standard curve when adding the same amount of interference components. The color of organic matter is usually destroyed by sulfuric acid digestion. All of the above apply these methods, troublesome procedures, time and reagents. This paper studies the colorant does not work its own color interference substances, the choice of the appropriate measurement wavelength and subtraction