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

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、...

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Bibliographic Details
Published in分析化学 Vol. 42; no. 3; pp. 459 - 460
Main Author 周明慧 王松雪 伍燕湘
Format Journal Article
LanguageChinese
Published 国家粮食局科学研究院质量安全研究组,北京,100037 2014
Subjects
原子吸收光谱法
快速测定
提取
电感耦合等离子体质谱法
直接进样
石墨炉原子吸收法
谷物
重金属铅
Lead
grain
Graphite furnace atomic absorption spectrophotometry
Diluted acid mild extraction
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ISSN0253-3820
DOI10.3724/SP.J.1096.2014.31156

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Summary: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、
Bibliography:ZHOU Ming-Hui, WANG Song-Xue＊ , WU Yan-Xiang （Cereals and Oils Quality and Safety Research Group, Academy of State Administration of Grain, Beijing 100037, China）
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,
ISSN:0253-3820
DOI:10.3724/SP.J.1096.2014.31156