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目的:探索和建立浊点萃取分离富集、火焰原子吸收光谱法测定生活饮用水的镉的新方法,使环境危险因素镉的分析过程中而产生的二次污染减少至最低限度。方法:水样经浓缩后在pH 8~9的范围内以8-羟基喹啉作为螯合剂、TritonX-114为非离子表面活性剂,在45℃水浴15 m in优化条件下分离富集,经火焰原子吸收光谱分析测定。结果:方法富集倍率为50,在0.0 mg/L~0.025 mg/L范围内呈良好线性关系,相对标准偏差小于5.%,加标平均回收率范围为:95%~105%。结论:本方法不使用挥发性有机物质萃取、简便快速、准确可靠,适用于生活饮用水中微量镉的含量测定。
OBJECTIVE: To explore and establish a new method for the determination of cadmium in drinking water by flame atomic absorption spectrometry with separation and enrichment by cloud point extraction, and to minimize the secondary pollution during the analysis of environmental cadmium. Methods: The water samples were concentrated with 8-hydroxyquinoline as chelating agent and TritonX-114 as non-ionic surfactant in the pH range of 8-9, and then separated and enriched under the optimized conditions of 45 ℃ water bath for 15 minutes. Flame atomic absorption spectrometric analysis. Results: The method showed a good linearity in the range of 0.0 mg / L to 0.025 mg / L and the relative standard deviation was less than 5.%. The average recoveries ranged from 95% to 105%. Conclusion: The method is not volatile organic material extraction, simple, rapid, accurate and reliable, suitable for determination of trace amounts of cadmium in drinking water.