水中痕量锰的浊点萃取-火焰原子吸收光谱测定法  

Determination of Trace Manganese in Water Samples by Flame Atomic Absorption Spectrometry with Cloud Point Extraction

作　　者：肖珊美[1] 陈建荣[2] 杨晓东[1] 

机构地区：[1]金华职业技术学院材料与化工学院,浙江金华321007 [2]浙江师范大学化学与生命科学学院,浙江金华321004

出　　处：《环境与健康杂志》2007年第5期350-352,共3页Journal of Environment and Health

基　　金：浙江省自然科学基金资助项目(202127);浙江省分析测试基金资助项目(04057);金华职业技术学院校级科研基金资助项目(20041130)

摘　　要：目的建立水中痕量锰的浊点萃取-火焰原子吸收光谱测定方法。方法选用非离子表面活性剂聚乙二醇辛基苯基醚(Triton X-114)作为浊点萃取剂,1-(2-吡啶偶氮)-2-萘酚(PAN)作为螯合剂,富集、分离水中痕量锰,采用火焰原子吸收光谱法进行检测。结果在优化的实验条件下,采用该方法测定50ml样品,结果显示,锰的检测限为0.28μg/L,富集倍率为65倍,线性范围为0.93～120μg/L,r=0.999,回收率在98.0%～101.5%之间,相对标准偏差为2.17%。结论该方法具有简单、安全、快捷、灵敏、高效的特点,适用于环境水样中痕量锰的测定。Objective To develop a new method for the determination of trace manganese in water by flame atomic absorption after cloud point extraction. Methods The effect of experimental conditions such as pH value and concentration of reagents and equilibration temperature on cloud point extraction and determination sensitivity was discussed. The chemical variables affecting the separation phase and extraction recovery were optimized. Results Under the optimum conditions, pre-concentration of only 50 ml of sample in the presence of 0.05% Triton X-114 presented a detection limit of 0.28μg/L （3σ） for manganese. The enhancement factor was 65 for manganese. The relative standard deviation was 2.17%. The calibration graph using the pre- concentration system for manganese was linear with a correlation coefficient of 0.999 at levels near the detection limits up to at least 120μg/L. The recovery rates were 98.0%-101.5%. Conclusion The method is rapid, accurate, simple and is suitable for determination of trace manganese in water samples.

关 键 词：锰 1-(2-吡啶偶氮)-2-萘酚 浊点萃取 火焰原子吸收光谱法 

分 类 号：O657.31[理学—分析化学]