Bioaccessibility of Arsenic Bound to Corundum Using a Simulated Gastrointestinal System

Author:

Beak Douglas G.,Basta Nicholas T.,Scheckel Kirk G.,Traina Samuel J.

Abstract

Environmental Context. Ingestion of soil contaminated with arsenic is an important pathway for human exposure to arsenic. The risk posed by ingestion of arsenic-contaminated soil depends on how much arsenic is dissolved in the gastrointestinal tract. Aluminum oxides are common components in the soil and act as a sink for arsenic. Knowledge of the behavior of arsenic associated with aluminum oxide surfaces in a simulated gastrointestinal tract will provide an understanding of the ingestion risk of arsenic-contaminated soil to humans. Abstract. Arsenate adsorbed to oxide surfaces may influence the risk posed by incidental ingestion of arsenic-contaminated soil. Arsenate sorbed to corundum (α-Al2O3), a model Al oxide, was used to simulate ingested soil that has AsV sorbed to Al oxides. An in vitro assay was used to simulate the gastrointestinal tract and ascertain the bioaccessibility of arsenate bound to corundum. The surface speciation of arsenate was determined using extended X-ray absorption fine structure and X-ray absorption near edge structure spectroscopy. The arsenate sorption maximum was found to be 470 mg kg–1 and the surface speciation of the sorbed arsenate was inner-sphere binuclear bidenate. The AsV was found to only be bioaccessible during the gastric phase of the in vitro assay. When the sorbed AsV was <470 mg kg–1 (i.e., the sorption maxima) the bioaccessible As was below detection levels, but when sorbed AsV was ≥470 mg kg–1 the bioaccessible As ranged from 9 to 16%. These results demonstrate that the bioaccessibility of arsenate is related to the concentration and the arsenate binding capacity of the binding soil.

Publisher

CSIRO Publishing

Subject

Geochemistry and Petrology,Environmental Chemistry,Chemistry (miscellaneous)

Cited by 8 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3