稀酸温和提取直接进样石墨炉原子吸收法快速测定谷物中铅的含量  

Rapid Direct Sampling Detection of Pb in Grain Using Diluted Acid Extraction Coupled with Graphite Furnace Atomic Absorption Spectrophotometry

作　　者：周明慧[1] 王松雪[1] 伍燕湘[1] 

机构地区：[1]国家粮食局科学研究院质量安全研究组,北京100037

出　　处：《分析化学》2014年第3期459-460,共2页Chinese Journal of Analytical Chemistry

基　　金：粮食公益性行业科研专项(No.201313005-2);中央级公益性科研院所基本业务费课题(No.ZX1301)资助

摘　　要：1引言重金属铅是谷物中污染物主要卫生限量指标之一，对人体危害很大。随着日益增长的粮食质量安全监测需求，开发出能够快速准确检验谷物中铅含量的方法变得尤为迫切。目前，谷物及其它样品中铅元素的检测方法主要有原子吸收光谱法（AAS）、电感耦合等离子体质谱法、A mild rapid method for the determination of Pb in grain was established by diluted acid extraction and direct sampling detection with graphite furnace atomic absorption spectrophotometer（GF-AAS）. Some factors, such as the grain size, nitric acid concentration, extraction time, solid, liquid proportion, and the instrument conditions were optimized. The results indicated that, at room temperature, the extraction rate of Pb in grain by diluted nitric acid was between 92.14% and 94.75% , and the average recoveries of Pb in grain extract reached 91.65% -94.58%, the precision of method was less than 5%, and the method detection limits and quantification limits were 0.64 txg/L and 2.14 tzg/L, respectively, meanwhile, the extraction time was shorten to no more than 30 min. Compared with the results pretreated by microwave digestion and determined by GF-AAS, the detection values obtained by diluted acid extraction had no significance difference （p〈0.1）.

关 键 词：石墨炉原子吸收法 重金属铅 谷物 快速测定 直接进样 电感耦合等离子体质谱法 原子吸收光谱法 提取 

分 类 号：TS210.7[轻工技术与工程—粮食、油脂及植物蛋白工程] O657.3[轻工技术与工程—食品科学与工程]