无火焰原子吸收法测定饮用水中铅和镉的条件探讨
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摘要
目的探讨石墨炉-原子吸收光谱法检测生活饮用水中的铅、镉元素简便准确的测定条件。方法探究了普析通用TAS990原子吸收分光光度计测定饮用水中铅、镉含量的最佳升温程序,采用标准加入法不加基体改进剂不扣背景分析测定生活饮用水中铅、镉,分别以未检出、检出铅和镉水样为稀释液的标准加入法曲线K值与标准曲线的K值进行比较。结果在优化条件下,铅的两种稀释液标准加入法曲线K值与标准曲线的K值比值分别为0.96和1,镉的两个比值为0.97和1,铅标准样品GSB07-1183-2000(201231)(35.3±1.9)μg/L,测定结果 37.1μg/L,镉标准样品GSB07-1185-2000(201427)(45.3±2.7)μg/L,测定结果 42.9μg/L,2个元素测定精密度在4.32%～9.89%。结论K值相同即接近或等于1,石墨炉-原子吸收光谱法测定生活饮用水中铅和镉基质干扰不会影响检测结果,可以简化操作条件不扣除背景,铅和镉的标准样品在保证范围内,方法简便、准确。
Objective The determination of lead and cadmium in drinking water by graphite furnace-atomic absorption spectrometry was discussed.Methods Explores the general analysis of TAS990 atomic absorption spectrophotometer determination of lead,cadmium content in drinking water,the best temperature program,using the standard addition method and matrix modifier and buckle background analysis for determination of lead,cadmium in drinking water was optimized,compared with not checked out,two different preliminary treatmentsof water sample's standard addition method's K value were compared.Results Under optimized conditions,the two diluent standard addition method of lead curve K value and the standard curve of the K value were 0.96,1,and the two ratio is 0.97,1,cadmium lead standard sample GSB07-1183-2000(201231)to 35.3+1.9μg/L,the determination results of 37.1μg/L,cadmium standard sample GSB07-1185-2000(201427)to 45.3+2.7 μg/L,the determination results of 42.9 μg/L,precision was 4.32%～9.89%.Conclusion K value is close to or equal to 1,same-graphite furnace atomic absorption spectrometry determination of lead and cadmium in drinking water matrix interference,will not affect the test result of lead and cadmium standard sample within the scope of the guarantee,the method is simple and accurate.
Objective The determination of lead and cadmium in drinking water by graphite furnace-atomic absorption spectrometry was discussed.Methods Explores the general analysis of TAS990 atomic absorption spectrophotometer determination of lead,cadmium content in drinking water,the best temperature program,using the standard addition method and matrix modifier and buckle background analysis for determination of lead,cadmium in drinking water was optimized,compared with not checked out,two different preliminary treatmentsof water sample's standard addition method's K value were compared.Results Under optimized conditions,the two diluent standard addition method of lead curve K value and the standard curve of the K value were 0.96,1,and the two ratio is 0.97,1,cadmium lead standard sample GSB07-1183-2000(201231)to 35.3+1.9μg/L,the determination results of 37.1μg/L,cadmium standard sample GSB07-1185-2000(201427)to 45.3+2.7 μg/L,the determination results of 42.9 μg/L,precision was 4.32%～9.89%.Conclusion K value is close to or equal to 1,same-graphite furnace atomic absorption spectrometry determination of lead and cadmium in drinking water matrix interference,will not affect the test result of lead and cadmium standard sample within the scope of the guarantee,the method is simple and accurate.
引文
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[2]孙永虎,古桂雄,洪庆成.铅对人体危害的研究[J].医学综述,2004,10(8):502-505.
[3]吴庆轩,罗济文,梁红.铅、镉对人体的作用[J].广西师范学报,1998,2(15):83-86.
[4]彭雪梅,刘永文,富中华.大同市饮用水矿质元素分析[J].山西大同大学学报,2011,27(5):45-47.
[5]郭明才,陈金东,李蔚,等.原子吸收光谱分析应用指南[M].青岛:中国海洋大学出版社,2012:83-89.
[6]李昌厚.原子吸收分光光度计仪器及应用[M].北京:科学出版社,2006:185-189.
[7]李延志,张弦.浊点萃取-石墨炉原子吸收光谱法检测中成药镉残留量[J].光谱实验室,2010,27(3):933-936.
[8]贺小敏,王敏,王小东,等,微波消解-石墨炉原子吸收光谱法测定菜籽及饼粕中铅和镉[J].光谱学与光谱分析,2007,17(11):2353-2356.