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利用二甲酚橙为显色剂,在CTMAB作用下与铅发生显色反应能形成三元络合物,建立了一种高灵敏度、高效的流动注射分光光度法检测水质铅的含量新方法。实验中详细地探讨和优化了显色体系及各个仪器参数,对仪器的稳定性、精密度及线性范围进行了测试,探讨了各干扰离子对灵敏度的影响。本方法在铅浓度为8-2000μg·L-1范围内,线性方程为ΔA=0.1526C+4.1519(μg/mL),相关系数r=0.9991,线性关系良好;方法的检出限(3σ)为2.96μg·L-1;以10次连续进样,测定400μg·L-1铅的加标样品,其相对标准偏差(RSD)为1.53%,仪器稳定性良好。测试实际水样并与国标测试结果一致,加标回收率在98.3%和102.5%之间,方法实用性强。
Using xylenol orange as chromogenic reagent, a ternary complex was formed by the color reaction with lead under the action of CTMAB. A new sensitive and efficient flow injection spectrophotometric method for the determination of lead in water was established. In the experiment, the colorimetric system and parameters of each instrument were discussed and optimized in detail. The stability, precision and linear range of the instrument were tested, and the influence of each interfering ion on the sensitivity was discussed. The linear equation was ΔA = 0.1526C + 4.1519 (μg / mL) in the range of 8-2000μg · L-1 and the correlation coefficient was 0.9991. The linearity was good. The detection limit (3σ) was 2.96μg · L-1. The relative standard deviation (RSD) was 1.53% for the spiked samples with 400μg · L-1 lead by 10 consecutive injections. The stability of the instrument was good. Test the actual water samples and consistent with the national standard test results, the spike recovery was between 98.3% and 102.5%, the method is practical.