X射线荧光分析测定不同品牌大米中的微量元素  

Trace elements anslysis in Chinese rice of different brands as studied by X-ray fluorescence

作　　者：王君玲[1] 黎龙辉 段泽明 李融武[2] 潘秋丽[1] 程琳[1] 

机构地区：[1]北京师范大学核科学与技术学院射线束技术与材料改性教育部重点实验室北京市辐射中心,北京100875 [2]北京师范大学物理学系,北京100875

出　　处：《北京师范大学学报（自然科学版）》2016年第2期156-160,共5页Journal of Beijing Normal University(Natural Science)

基　　金：北京市自然科学基金资助项目(1162006;1102022);国家自然科学基金资助项目(11175022;11575026);中央高校基本科研业务费专项资金资助项目(2014KJJCB06)

摘　　要：大米是人类从外界获得营养的主要方式之一,大米中的微量元素对人体的健康有重要的意义.为人体合理补充微量元素提供参考意见.本文利用X射线荧光分析方法并结合干灰化样品前处理方法研究了岳阳、五常、新民、哈尔滨、万昌等5种不同品牌大米中K、Ca、Cr、Mn、Fe、Co、Ni、Cu、Zn、As、Se、Sr等微量元素的含量;同时,用毛细管X光透镜聚焦的微束X射线荧光扫描了单粒大米中多元素的分布.结果表明,5种品牌大米中所含微量元素种类基本相同,五常大米中对人体有益的元素Ca、Fe、Ni、Zn等含量较高;此外,P、Cl、K、Ca等元素主要富集在大米的胚芽处.大米中微量的金属元素Fe、Cu、Zn等元素分布均匀.Rice is one of the main food for humans to obtain energy from the outside world,and trace elements in rice are of great significance to human health.To provide references for human,food concentrations of K,Ca,Cr,Mn,Fe,Co,Ni,Cu,Zn,As,Se,Sr in rice of Yueyang,Wuchang,Xinmin,Harbin,Wanchang were analyzed by X-ray fluorescence after dry ash pretreatment and distribution of elements in rice was studied by micro-X-ray fluorescence.It found that concentrations of elements in the five brands were similar.Moreover Wuchang rice was the most abundant in Ca,Fe,Ni,Zn elements.Micro-X-ray fluorescence analysis indicated that Fe,Cu and Zn were evenly distributed while P,Cl,K,Ca were enriched in the rice germ.

关 键 词：X射线荧光分析 微束X射线荧光 大米 微量元素 

分 类 号：O434.1[机械工程—光学工程]