摘要
建立了溶剂稀释植物油直接进样石墨炉原子吸收测定铅含量的方法。以磷酸二氢铵和硝酸镁混合溶液为基体改进剂,正丁醇溶解植物油,形成均匀透明的溶液,利用石墨炉原子吸收光谱仪测定植物油中的铅含量。优化了石墨炉原子吸收光谱法测定参数。结果表明:在优化条件下,该方法在铅质量浓度0~80μg/L范围内具有良好的线性关系(r=0.996),精密度实验RSD为3.4%~5.8%,检出限为3.2μg/L,回收率为96.0%~104.0%,RSD为3.6%~4.2%。该方法简单快速,灵敏度高,回收率好,适用于植物油中的铅含量测定。
A method for determining Pb content by direct injection after vegetable oil diluted with solvent by graphite furnace atomic absorption spectrometry was established. Taking NH4H2PO4 and Mg（NO3）2 mixed solution as matrix modifier,vegetable oil was dissolved by butanol to form a uniform and transparent solution,and the Pb content was determined by graphite furnace atomic absorption spectrometry. The parameters of graphite furnace atomic absorption spectrometry were optimized. The results showed that under the optimal conditions, the method had a good linear relationship with the mass concentration of Pb in the range of 0-80 μg/L （r=0.996）, and the relative standard deviation in precision experiment was 3.4%-5.8%. The limit of detection, recovery rate and relative standard deviation were 3.2 μg/L, 96.0%-104.0% and 3.6%-4.2%, respectively. The method had the items of simpleness, rapidness, high sensitivity and good recovery, and was suitable for the determination of Pb content in vegetable oil.
出处
《中国油脂》
CAS
CSCD
北大核心
2017年第12期142-144,153,共4页
China Oils and Fats
基金
"十三五"国家重点研发计划项目(2016YFD0401401)
关键词
植物油
直接进样
石墨炉原子吸收光谱法
铅
vegetable oil
direct injection
graphite furnace atomic absorption spectrometry
Pb
