微乳液进样-石墨炉原子吸收光谱法测定食用油中铅
GFAAS Determination of Lead in Edible Oil with Micro-emulsion Injection
摘 要
食用油样品被制备成微乳液后,直接进样,用石墨炉原子吸收光谱法测定其中铅的含量。应用塞曼效应消除背景干扰,以磷酸二氢铵作为基体改进剂,灰化温度为500 ℃、原子化温度为1 800 ℃。铅的质量浓度在100 μg·L-1范围内与其吸光度呈线性关系,检出限(3s)为2.18 pg。应用此法分析了5种食用油样品,加标回收率在89.8%~110%之间,相对标准偏差(n=6)在3.4%~7.1%之间。
石墨炉原子吸收光谱法
食用油
铅
Micro-emulsion
GFAAS
Edible oil
Lead
Abstract
The micro-emulsion of sample of edible oil was prepared and introduced directly into the instrument, the content of lead was determined by GFAAS. The Zeeman effect was applied to eliminate the interference of background, NH4H2PO4 was used as matrix modifier, and temperatures for ashing and atomization were set at 500 ℃ and 1 800 ℃ respectively. Linear relationship between values of absorbance and mass concentration of lead was obtained in the range within 100 μg·L-1, with detection limit (3s) of 2.18 pg. The proposed method was used in the analysis of 5 samples of edible oil, values of recovery found by standard addition method were in the range of 89.8%-110%, and values of RSD (n=6) found were in the range of 3.4%-7.1%.
中图分类号 O657.31
所属栏目 工作简报
基金项目
收稿日期 2012/7/25
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备注徐旭耀(1982-),男,广东蕉岭人,实验师,硕士,主要研究方向为光谱和色谱分析。
引用该论文: XU Xu-yao,PAN Li-juan,CHEN Jin-ling. GFAAS Determination of Lead in Edible Oil with Micro-emulsion Injection[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2013, 49(7): 855～857
徐旭耀,潘丽娟,陈金玲. 微乳液进样-石墨炉原子吸收光谱法测定食用油中铅[J]. 理化检验－化学分册, 2013, 49(7): 855～857
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参考文献
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【5】蒋丽,姚浔平,孔令威.石墨炉原子吸收法测定食用油中铅含量前处理方法比较［J］.中国卫生检验杂志, 2011,21(5):1127-1131.
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【7】徐旭耀,陈昆愉,谢薇薇,等.石墨炉原子吸收光谱法测定湖光岩地区岩石中镉［J］.理化检验-化学分册, 2011,47(9):1029-1030.
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