【摘要】 基于铜(Ⅱ)对过氧化氢氧化溴甲酚紫退色反应的强烈催化作用,建立了在非离子型微乳液存在下一种测定痕量铜(Ⅱ)的新方法。通过L9(34)正交实验设计得到测定痕量铜的最佳条件,在优化的实验条件下,在0.05 mol/L的氨水溶液中,以588 nm为测定波长,本方法测定在0~1.6 ng/mL范围内吸光度ΔA与Cu2+浓度呈线性关系,线性回归方程为:ΔA=-0.004 8+0.024 6c(ng/mL),相关系数为R=0.9979,检出限为1.08×10-8g/L。应用该方法对水样中的痕量铜进行测定,加标回收率为96%~105%。结果表明,该方法具有较高的灵敏度、准确度与精密度,测定过程迅速、简便,水样中常见离子无干扰。更多还原

【Abstract】 A catalytic spectrophotometric method to determine trace copper was established based on the color fading reaction of H2O2,bromocresol purple and copper(Ⅱ) in presence of non-ionic microemulsion.The optimum conditions of the catalytic reaction were studied by orthorhombic experiments(L9(34)).The results showed that the change of absorbances was linear to the copper concentration in the range of 0～1.6 ng/mL,with the regression equation ΔA=-0.004 8+0.024 6c(ng/mL),correlation coefficient is 0.997 9 and the detection limit is 1.08×10-8 g/L.Under the optimum conditions,standard addition recovery was around 96% to 105%.This method has many advantages,such as high sensitivity,good accuracy,well convenience,simplicity,and no interference from other components in water medium.更多还原