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偶氮胂Ⅲ的特殊分析用途就是它具有与某些元素形成稳定的络合物的能力。这就可以在强酸介质中进行测定(五价和四价元素—Pa、Np~Ⅳ、Th、Zr、Hf、U~Ⅳ—可高至10M HCl 或 H_2SO_4),并能保证更好的重现性,操作容易,受阴离子干扰小。由于反应有较好的对比效应(粉红→鲜绿,吸收峰的位移为125mμ),谱的特性好,并且具有在极端稀释的情况下络合物也不离解的可能性,因此有很高的灵敏度(0.1—0.01μg/ml,克分子,吸收系数为50—150×10~3)。
The special analytical use of arsenazo III is its ability to form stable complexes with certain elements. This can be measured in strong acid media (pentavalent and tetravalent elements -Pa, Np-IV, Th, Zr, Hf, U-IV- up to 10 M HCl or H 2 SO 4) and guarantees better reproducibility Sex, easy to operate, small interference by anion. Due to the good contrast effect of the reaction (pink → bright green, shift of the absorption peak of 125 mμ), good spectral properties and the possibility that the complex will not dissociate even under extreme dilution, there is a high Sensitivity (0.1-0.01μg / ml, molecular weight, absorption coefficient of 50-150 × 10-3).