【摘要】 研究了1 [(2,3,4 三羟基苯)偶氮] 4 苯甲酸(TKAB)与铋的显色反应,试验了5种不同表面活性剂及1种混合表面活性剂的增敏作用,选定Bi -TKAB-CTMAB显色体系。该体系在pH1 45～2 80形成稳定的红棕色络合物,在445nm处有最大吸收,表观摩尔吸光系数ε=5 45×104。铋的质量浓度在0～20μg/10mL范围内符合比尔定律。用于铜合金中痕量铋的直接测定,结果满意。更多还原

【Abstract】 The condition for forming the complex of Bi*# with 14benzoic acid(TKAB) in the presence of CTMAB is studiedIt is shown that a stable brownish red complex can be formed in acid mediumThe absorbance of the complex is measured at 445nm versus a reagent blank with apparent molar absorptivity of 545×104L·mol-1·cm-1Beer’s law is obeyed in the range of concentration from 0 to 20μg/10mL for Bi*#The method has been applied to the direct determination of trace bismuth in copper alloys with satisfactory results更多还原