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间氯偶氮安替比林光度测定钙已有报道。本文研究了间氯偶氮安替比林与铜的显色反应。试验结果表明,在pH7.6～8.8铜与显色剂形成1:1蓝色稳定的络合物,其最大吸收峰在625nm波长处,摩尔吸光率为3.32×10~4L·mol~(-1)·cm~(-1),比BCO法的灵敏度高1倍。当铜含量在0～50μg/25ml范围内符合比耳定律,络合物稳定,吸光度24h不变。在三乙醇胺存在下,利用柠檬酸钠和六偏磷酸钠联合掩蔽基体及其共存离子,拟定了铝合金、锡基合金和铜稀土镁硅铁中间合金中铜的光度测定法。 NO_2~-影响络合物的稳定性,吸光度不断降低,可加尿素消除。镍(Ⅱ)>5μg干扰测定。
Inter-chloroantipyrine antipyrine photometric determination of calcium has been reported. In this paper, the color reaction between m-chloroantipyrine and copper was studied. The results showed that the blue-stable 1: 1 complex formed between copper and chromogenic reagent at pH7.6-8.8 had the maximum absorption at 625nm and the molar absorptivity of 3.32 × 10-4L · mol ~ (- 1) · cm ~ (-1), which is 1 time more sensitive than the BCO method. When the copper content in the range of 0 ~ 50μg / 25ml Beer’s law in line with the stability of the complex, absorbance 24h unchanged. In the presence of triethanolamine, sodium citrate and sodium hexametaphosphate combined with masking matrix and its coexisting ions were used to develop a spectrophotometric method for the determination of copper in aluminum alloy, tin-based alloy and copper rare earth magnesium ferrosilicon master alloy. NO_2 ~ - affect the stability of the complex, absorbance continues to decrease, can add urea to eliminate. Nickel (II)> 5 μg interference assay.