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在非离子型微乳液(OP/n-C5H11OH/n-C7H16/H2O)存在下,Cu2+与硫氰酸盐形成络阴离子[Cu(SCN)4]2-,在pH 3.6乙酸盐缓冲溶液中,该络阴离子再与乙基紫(EV)形成吸附型离子络合物,该络合物的组成为[Cu(SCN)4]2-:EV=1:2,最大吸收波长为660nm,表观摩尔吸光系数ε660为1.08×l05L.mol-1.cm-1,Cu2+含量在1.7～18.0μg/50 mL范围内符合比尔定律,检出限为0.5μg/50 mL,用该方法测定了钢中的铜,相对标准偏差小于2%。
In the presence of nonionic microemulsions (OP / n-C5H11OH / n-C7H16 / H2O), Cu2 + forms a complex anion with Cu (SCN) 4 2- with thiocyanate in pH 3.6 acetate buffer , The complex anion and ethyl violet (EV) to form adsorption ion complex, the composition of the complex [Cu (SCN) 4] 2-: EV = 1: 2, the maximum absorption wavelength of 660nm, the table The molar extinction coefficient ε660 was 1.08 × l05L.mol-1.cm-1. Beer’s law was obeyed in the range of 1.7 ~ 18.0μg / 50mL. The detection limit was 0.5μg / 50mL. The content of Cu2 + In the copper, the relative standard deviation of less than 2%.