Determination of content and chemical speciation of heavy metals and As in edible fungi
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摘要: 以黑木耳、香菇、金针菇和灰树花四种食用菌作为研究对象,采用电感耦合等离子体发射光谱（ICP-OES）测定As、Pb、Cd、Cr、Cu五种元素的总量;采用Tessier连续浸提法制备样品,对以上五种元素进行形态分析。结果表明:四种食用菌中重金属和砷总量符合大部分相关国家限量标准。重金属和砷的形态分析表明,四种食用菌中As均以离子交换态为主;Pb在四种食用菌中存在形态差异很大;除金针菇外其他三种食用菌中Cd均以水溶态和离子交换态为主;Cr在各食用菌中存在形态差异很大;除黑木耳外其他三种食用菌中Cu均以水溶态为主。本文表明连续浸提法可用于食用菌重金属和砷的形态分析,反映食用菌中重金属及砷的形态分布信息。Abstract: The content of As、Pb、Cd、Cr、Cu in four kinds of edible fungi (Auricularia auricular, Lentinus edodes, Flammulina velutipes and Grifola frondosa) was determined by inductively coupled plasma optical emission spectrometry (ICP-OES) . Chemical speciation of heavy metals and As in samples was carried out by Tessier sequential extraction procedure. It was shown that the metal content was within most of the national standards.As in four kinds of edible fungi was mainly in forms of exchangeable, the chemical speciaion of Pb in four kinds of edible fungi was quite different, Cd in other three kinds of edible fungi was mainly in forms of water soluble and exchangeable except Flammulina velutipes, the chemical speciaion of Cr in four kinds of edible fungi was quite different, Cu in other three kinds of edible fungi was mainly in forms of water soluble except Auricularia auricular. This article showed that the Tessier sequential extraction procedure could be used for the chemical speciation of heavy metals and As in edible fungi satisfactory, and reflected the distribution information of chemical speciation.
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Keywords:
- edible fungi /
- heavy metals /
- As /
- ICP-OES /
- chemical speciation
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