中国科学院生态环境研究中心机构知识库
Advanced  
RCEES OpenIR  > 土壤环境科学实验室  > 期刊论文
题名: Speciation and localization of arsenic in white and brown rice grains
作者: Meharg, Andrew A. ; Lombi, Enzo ; Williams, Paul N. ; Scheckel, Kirk G. ; Feldmann, Joerg ; Raab, Andrea ; Zhu, Yongguan ; Islam, Rafiql
刊名: ENVIRONMENTAL SCIENCE & TECHNOLOGY
出版日期: 2008-02-15
卷号: 42, 期号:4, 页码:1051-1057
部门归属: 土壤环境科学实验室
英文摘要: Synchrotron-based X-ray fluorescence (S-XRF) was utilized to locate arsenic (As) in polished (white) and unpolished (brown) rice grains from the United States, China, and Bangladesh. In white rice As was generally dispersed throughout the grain, the bulk of which constitutes the endosperm. In brown rice As was found to be preferentially localized at the surface, in the region corresponding to the pericarp and aleurone layer. Copper, iron, manganese, and zinc localization followed that of arsenic in brown rice, while the location for cadmium and nickel was distinctly different, showing relatively even distribution throughout the endosperm. The localization of As in the outer grain of brown rice was confirmed by laser ablation ICP-MS. Arsenic speciation of all grains using spatially resolved X-ray absorption near edge structure (mu-XANES) and bulk extraction followed by anion exchange HPLC-ICP-MS revealed the presence of mainly inorganic As and dimethylarsinic acid (DMA). However, the two techniques indicated different proportions of inorganic:organic As species. A wider survey of whole grain speciation of white (n = 39) and brown (n = 45) rice samples from numerous sources (field collected, supermarket survey, and pot trials) showed that brown rice had a higher proportion of inorganic arsenic present than white rice. Furthermore, the percentage of DMA present in the grain increased along with total grain arsenic.
WOS记录号: WOS:000253250800018
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/22344
Appears in Collections:土壤环境科学实验室_期刊论文

Files in This Item: Download All
File Name/ File Size Content Type Version Access License
Speciation and localization of arsenic in white and brown rice grains.pdf(2166KB)----开放获取View Download
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Meharg, Andrew A.]'s Articles
[Lombi, Enzo]'s Articles
[Williams, Paul N.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Meharg, Andrew A.]‘s Articles
[Lombi, Enzo]‘s Articles
[Williams, Paul N.]‘s Articles
Related Copyright Policies
Null
Social Bookmarking
Add to CiteULike Add to Connotea Add to Del.icio.us Add to Digg Add to Reddit
文件名: Speciation and localization of arsenic in white and brown rice grains.pdf
格式: Adobe PDF
此文件暂不支持浏览
所有评论 (0)
暂无评论
 
评注功能仅针对注册用户开放,请您登录
您对该条目有什么异议,请填写以下表单,管理员会尽快联系您。
内 容:
Email:  *
单位:
验证码:   刷新
您在IR的使用过程中有什么好的想法或者建议可以反馈给我们。
标 题:
 *
内 容:
Email:  *
验证码:   刷新

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.

 

 

Valid XHTML 1.0!
Copyright © 2007-2018  中国科学院生态环境研究中心 - Feedback
Powered by CSpace