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采用氨基二硫代甲酸钠分光光度法与流动注射分析(FIA)联用,建立了一种快速、简便、高灵敏度且线性范围大的分析水体中微量铜的方法。在阿拉伯树胶粉溶液存在,以氨水为缓冲溶液(pH 9～10),并以吐温80作为增敏剂的最佳优化实验条件下当Cu2+的质量浓度在0.005～4 mg/L时,Cu2+的浓度和对应峰高呈现较好的线性,其线性方程为:y=191.279 x+2.979(R2=0.99991);检出限为0.8749μg/L;相对标准偏差(RSD)为0.8832%(200μg/L Cu2+,n=20)。利用本方法测定环境水样中的铜,回收率在95.82%～101.81%之间,结果令人满意。
A rapid, simple, sensitive and linear method for the determination of trace copper in water was established by sodium dithiocarbamate spectrophotometry and flow injection analysis (FIA). When the mass concentration of Cu2 + was between 0.005 and 4 mg / L in the optimal solution of the gum powder solution, ammonia buffer solution (pH 9-10) and Tween 80 as the sensitizer, The linear equation of Cu2 + showed a good linearity with the corresponding peak height. The linear equation was: y = 191.279 x +2.979 (R2 = 0.99991); the detection limit was 0.8749μg / L; the relative standard deviation (RSD) was 0.8832% / L Cu2 +, n = 20). The determination of copper in environmental water samples by this method was satisfactory with the recoveries between 95.82% and 101.81%.