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从有关文献获悉二甲酚橙与锌离子在pH 5～6时会生成紫红色的稳定络合物,其最大吸收峰在574毫微米处,摩尔吸光系数为2.25×10~4。由于国内外二甲酚橙商品中含有杂质,它会使测锌灵敏度下降,造成测定数据因产品批号之不同而异。本文介绍二甲酚橙纯品与锌络合测定的最佳条件以及杂质对二甲酚橙测锌灵敏度的干扰情况。实验部分1.仪器和试剂仪器:72型分光光度计试剂:锌标准液配制:0.01 mg ml~(-1),称取0.125克氧化锌(ZnO),溶于100毫升水及1毫升硫酸中,移
It has been learned from the literature that xylenol orange and zinc ions produce a purple complex at pH 5-6 with a maximum absorption peak at 574 nm and a molar absorptivity of 2.25 × 10 -4. As xylenol orange products at home and abroad contain impurities, it will reduce the sensitivity of zinc, resulting in the measured data due to different product lot numbers vary. This article describes the determination of xylenol orange pure complexation of zinc and the best conditions for the determination of impurities and xylenol orange zinc sensitivity of the interference. Experimental Part 1. Instruments and Reagents Apparatus: Spectrophotometer type 72 Reagents: Zinc standard solution: 0.01 mg ml -1, 0.125 g zinc oxide (ZnO) weighed, dissolved in 100 ml water and 1 ml sulfuric acid ,shift