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光度法测铝目前主要为三元显色体系。我们在前人工作的基础上,研究了Al-铬天菁S(CAS)-溴化十四烷基吡啶(TPB)-乙醇四元显色体系的显色条件。实验表明在pH4.6—6.0范围内络合物吸光度最大且恒定不变,络合物最大吸收波长为650nm(未校正波长),摩尔吸光系数为1.5×10~5cm~(-1)·mol~(-1)。
Spectrophotometry is currently the main aluminum ternary color system. Based on the work of our predecessors, we studied the conditions for the color development of Al-chrysanthemum S (CAS) -tetradecylpyridine bromide (TPB) -ethanol four-color system. The results showed that the absorbance of the complex was the largest and constant at pH 4.6-6.0. The maximum absorption wavelength of the complex was 650 nm (uncorrected wavelength) and the molar absorptivity was 1.5 × 10 -5 cm -1 ~ (-1).