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100μg·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。
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, NH4 H2 PO4 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 ℃g. 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%.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2013年第7期855-857,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
