石墨炉原子吸收光谱法测定植物油中砷

Determination of arsenic in vegetable oil by graphite furnace atomic absorption spectrophotometry

目的:建立检测植物油中砷含量的石墨炉原子吸收光谱方法。方法:样品经微波消化后,采用硝酸镁作为基体改进剂,石墨炉原子吸收光谱法测定。结果:方法线性范围为0μg/L～20μg/L,相关系数为0.9997,方法检出限为0.006 mg/kg,RSD为2.7%～3.2%,加标回收率为84.7%～99.0%。结论:本法简便、灵敏度高、重现性好,适用于植物油中砷的测定。

Objective：To develop a method for the determination of arsenic in vegetable oil by graphite furnace atomic absorption spectrophotometry.Methods： After samples were digested with microwave,magnesium nitrate was added as matrix modifier and then determined by graphite furnace atomic absorption spectrometry.Results： The method had a linear relationship in the range of 0 μg/L^20 μg/L（r=0.9997）,and the detection limit was 0.006 mg/kg,RSDs were between 2.7%~3.2%,the rate of recoveries were between 84.7%~99.0%.Conclusion： The method is simple,sensitive,reproducible and can be applicable to the determination of arsenic in vegetable oil.