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在Tween-80和十二烷基硫酸钠存在下,当pH为9.5时,镍(Ⅱ)与2-(6-溴-2-苯骈噻唑偶氮)-5-二乙氨基苯酚反应,形成红紫色配合物;它在540nm处有最大吸收,其摩尔吸光系数(ε)为2.5×10~5L·mol~(-1)·cm~(-1)。试剂Br-BTAE在此波长下亦存在最大吸收;但于40～50℃加热20分钟,可显著分解,因而空白降低,误差可忽略。在1mL溶液中含0.01～0.125μg镍时遵循比尔定律。配合物的组成为Ni/Br-BTAE=1∶2(连续变更浓度法)。此法可测定经丁二酮肟萃取后的电镀废水、铜合金、铝合金及几种钢样中的镍含量,分析结果与原子吸收法及丁二酮肟法的符合。
Nickel (II) reacts with 2- (6-bromo-2-benzothiazolylazo) -5-diethylaminophenol in the presence of Tween-80 and sodium lauryl sulfate to form It has the highest absorption at 540 nm and its molar absorption coefficient (ε) is 2.5 × 10 -5 L · mol -1 (-1) cm -1. Reagent Br-BTAE also has the maximum absorption at this wavelength; however, heating at 40-50 ° C for 20 minutes significantly degrades the blank and therefore the error is negligible. Beer’s law is followed when containing 0.01-0.1125 μg of nickel in 1 mL of solution. The composition of the complex was Ni / Br-BTAE = 1: 2 (continuously changing the concentration method). This method can be determined by the diacetylketoxime extraction of electroplating wastewater, copper alloy, aluminum alloy and several kinds of steel in the nickel content, analytical results and atomic absorption and dimethylglyoxime method of compliance.