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二苯卡巴肼(Diphenyl Carbazide)是测定痕量铬的常用显色剂,它与六价铬、钼在酸性介质中均形成红紫色络合物。虽然钼的灵敏度较低,但大量存在时将严重地干扰铬的测定。指出,钼和草酸按1:1克分子比络合。我们应用此性质,以草酸作为钼的掩蔽剂,试验了大量钼酸盐和草酸存在时铬的显色条件和共存离子的干扰,并应用于试样分析。方法简便、快速,最大相对偏差小于20％。一、试样分析和工作曲线 (一)主要试剂和仪器草酸:8％水溶液。用水溶解80克草酸,准确稀释至1000毫升;
Diphenylcarbazide (Diphenylcarbazide) is a common chromogenic reagent for the determination of trace chromium. It forms a magenta complex with hexavalent chromium and molybdenum in an acidic medium. Although the sensitivity of molybdenum is low, the presence of a large amount of chromium will seriously interfere with the determination of chromium. Pointed out that molybdenum and oxalic acid at 1: 1 molar ratio of complex. Using this property, we used oxalic acid as a masking agent for molybdenum to test the chromogenic conditions and the interference of coexisting ions in the presence of a large amount of molybdate and oxalic acid, and were applied to the sample analysis. The method is simple, fast, the maximum relative deviation less than 20%. First, sample analysis and working curve (A) of the main reagents and equipment oxalic acid: 8% aqueous solution. Dissolve 80 grams of oxalic acid in water and dilute to 1000 ml accurately.