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合成了新显色剂5-(6-甲氧基苯并噻唑偶氮)-8-羟基喹啉(MBTAHQ),分子式C17H12N4O2S,相对分子质量336.37,熔点227～228°C.详细研究了该试剂与镍显色反应的条件及分光光度性能.在弱酸性介质中,有非离子表面活性剂存在下,试剂与镍形成2∶1的紫红色络合物,最大吸收波长位于575nm处,表观摩尔吸光系数为1.46×105L·mol-1·cm-1.镍的浓度在0～240μg/L范围内服从比尔定律.显色体系灵敏度高,应用于铝合金中镍含量的测定,结果满意.
The new color reagent 5- (6-methoxybenzothiazolylazo) -8-hydroxyquinoline (MBTAHQ) has been synthesized with the molecular formula of C17H12N4O2S, its relative molecular mass is 336.37 and its melting point is 227-228 ° C. The effect of this reagent And nickel color reaction conditions and spectrophotometric performance in a weakly acidic medium, in the presence of non-ionic surfactant reagent and nickel to form a 2: 1 purple complex, the maximum absorption wavelength at 575nm Department of apparent friction The Absorbance coefficient was 1.46 × 105 L · mol-1 · cm-1, Beer’s law was obeyed in the range of 0 ~ 240 μg / L. The color system has high sensitivity and is applied to the determination of nickel content in aluminum alloy with satisfactory results.