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以二乙氨基二硫代甲酸钠(DDTC)分光光度法为基础,将新型浓缩柱在线富集与流动注射联用以测定水中痕量Cu2+,对浓缩柱的富集、解吸条件以及流动注射参数进行了考察。在最佳条件下,在0.25～45μg/L的范围内,Cu2+的浓度与峰高呈良好线性关系,其线性方程为:y=3.0553ρ+4.2244(R2=0.9984),检出限为0.082μg/L,相对标准偏差(RSD)为3.1%(25μg/L Cu2+,n=10)。利用本方法测定河水中的痕量铜,回收率在95.6%～99.6%之间。
On the basis of DDTC spectrophotometry, a novel enrichment column was developed for the simultaneous determination of trace amounts of Cu2 + in water by on-line enrichment and flow injection. The enrichment, desorption conditions and flow injection parameters The inspection. Under the optimum conditions, the linear relationship between Cu2 + concentration and peak height was obtained in the range of 0.25 ~ 45μg / L. The linear equation was: y = 3.0553ρ + 4.2244 (R2 = 0.9984) with the detection limit of 0.082μg / L, and the relative standard deviation (RSD) was 3.1% (25μg / L Cu2 +, n = 10). The determination of trace amounts of copper in river water by this method has a recovery of between 95.6% and 99.6%.