【摘要】 本文研究了新显色剂２－（５－溴－２－吡啶偶氮）－５－二甲氨基苯胺与镍（Ⅱ）的反应条件。试验结果发现，在阴离子表面活性剂十二烷基硫酸钠存在下，在ｐＨ５．２～６．５范围内，试剂与镍（Ⅱ）形成稳定的２∶１配合物。其最大吸收波长在５７０ｎｍ处，表观摩尔吸光系数为１．２４×１０￣５Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）。镍（Ⅱ）浓度在０～０．４μｇ·ｍＬ￣（－１）之间符合比尔定律。以硫脲和氟化按作掩蔽剂，可消除Ｃｕ￣（２＋）、Ｐｄ￣（２＋）、Ｆｅ￣（３＋）等离子的干扰。所拟方法用于铝合金中微量镍的测定，结果满意。更多还原

【Abstract】 A simple, sensitive and selective method for thespectrophotometric determination of nickel has beendeveloped.Nickel reacts with 2-(5-bromo-2-pyridyla-zo)-5-dimethylaminoaniline in the presence of sodiumlauryl sulfate to form a 1∶2 complex at pH 5.2～6.5. The molar absorptivity of the complex is 1. 24×10￣5L·mol￣(-1)·cm￣(-1)at 570nm. Beer’s law is obeyed inthe range of 0～0. 4μg Ni mL￣(-1). In the presence ofthiourea and ammonium fluoride,Cu, Pd andFe donot interfere,The method has been applied to the de-termination of Ni in aluminium alloys with satisfacto-ry results.更多还原