植物油料和食用油中铅含量检测的研究

Determination of lead in oilseeds and edible oil

选取花生、芝麻、油菜籽及对应的油脂样品，利用干灰化法一石墨炉原子吸收光谱法和微乳液法一石墨炉原子吸收光谱法分别测定其铅含量。结果显示：所检测12个油料样品中有8个样品铅含量超出植物油料卫生标准（GB19641--2005）的限量要求；所检测22个油脂样品中有1个油样铅含量超出食用植物油卫生标准（GB2716--2005）的限量要求；油料和对应油脂的铅含量呈正相关；微乳液法一石墨炉原子吸收光谱法测定油脂样品中痕量铅回收率在95％～106％之间。此法具有操作简便、灵敏度好、分析结果准确等特点。

The determination of trace lead in peanut, sesame, rapeseed and correspond oil by dry ashing graphite furnace atomic absorption spectrometry （GFAAS） and microemulsion method - GFAAS was re- searched. The results indicated that there were 8 samples in 12 oilseeds samples and 1 sample in 22 oil samples whose lead contents oversteped the limit of hygienic standard for oilseeds （GB 19641--2005 ） and edible vegetable oil（ GB 2716--2005）. The contents of lead in oilseeds and correspond oil were positive correlation. The recoveries of microemulsion method - GFAAS determining trace lead in edible oil were in the range of 95% - 106%, and the method was suitable to determine trace lead in edible oil for its merits of good sensitivity and exact results.