Next Article in Journal
Substrate Influences Temperature Sensitivity of Dissolved Organic Carbon (DOC) and Nitrogen (DON) Mineralization in Arid Agricultural Soils
Next Article in Special Issue
Deciphering and Predicting Microscale Controls on Radon Production in Soils, Sediments and Rock
Previous Article in Journal
Formation of the Azodication (ABTS2+) from ABTS [2,2′-Azinobis-(3-ethylbenzothiazoline-6-sulphonate)] in Sterile Plant Cultures: Root–Exuded Oxidoreductases Contribute to Rhizosphere Priming
Previous Article in Special Issue
Centennial Fertilization-Induced Soil Processes Control Trace Metal Dynamics. Lessons from a Long-Term Bare Fallow Experiment
Article Menu

Export Article

Open AccessArticle
Soil Syst. 2018, 2(2), 27; https://doi.org/10.3390/soilsystems2020027

Arsenic Speciation of Contaminated Soils/Solid Wastes and Relative Oral Bioavailability in Swine and Mice

1
School of Environment and Natural Resources, The Ohio State University, Columbus, OH 43210, USA
2
National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, Cincinnati, OH 45224, USA
3
U.S. Air Force Center for Engineering and the Environment, Lackland AFB, Bexar County, TX 78236, USA
4
National Exposure Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711, USA
5
Department of Veterinary Pathobiology, University of Missouri, Columbia, MO 65211, USA
Currently: U.S. Army Corps of Engineers, Engineer Research and Development Center, Environmental Laboratory, Vicksburg, MS 39180, USA.
Currently: Department of Plant and Soil Science, College of Agriculture and Natural Resources, University of Delaware, Newark, DE 19711, USA.
§
Currently: Office of Criminal Enforcement, Forensics, and Training, Office of Enforcement and Compliance Assurance, U.S. Environmental Protection Agency, Denver, CO 80225, USA.
*
Author to whom correspondence should be addressed.
Received: 21 December 2017 / Revised: 24 February 2018 / Accepted: 3 April 2018 / Published: 1 May 2018
(This article belongs to the Special Issue Soil Processes Controlling Contaminant Dynamics)
Full-Text   |   PDF [596 KB, uploaded 11 May 2018]   |  

Abstract

Arsenic (As) is one of the most widespread, toxic elements in the environment, and human activities have resulted in a large number of contaminated areas. However abundant, the potential of As toxicity from exposure to contaminated soils is limited to the fraction that will dissolve in the gastrointestinal system and be absorbed into systemic circulation or bioavailable species. In part, the release of As from contaminated soil to gastrointestinal fluid depends on the form of solid phase As, also termed “As speciation”. In this study, 27 As-contaminated soils and solid wastes were analyzed using X-ray absorption spectroscopy (XAS) and results were compared to in vivo bioavailability values determined using the adult mouse and juvenile swine bioassays. Arsenic bioavailability was lowest for soils that contained large amounts of arsenopyrite and highest for materials that contained large amounts of ferric arsenates. Soil and solid waste type and properties rather than the contamination source had the greatest influence on As speciation. Principal component analysis determined that As(V) adsorbed and ferric arsenates were the dominant species that control As speciation in the selected materials. Multiple linear regression (MLR) was used to determine the ability of As speciation to predict bioavailability. Arsenic speciation was predictive of 27% and 16% of Relative Bioavailable (RBA) As determined using the juvenile swine and adult mouse models, respectively. Arsenic speciation can provide a conservative estimate of RBA As using MLR for the juvenile swine and adult mouse bioassays at 55% and 53%, respectively. View Full-Text
Keywords: arsenic; bioavailability; speciation; EXAFS; XANES arsenic; bioavailability; speciation; EXAFS; XANES
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Supplementary material

SciFeed

Share & Cite This Article

MDPI and ACS Style

Stevens, B.N.; Betts, A.R.; Miller, B.W.; Scheckel, K.G.; Anderson, R.H.; Bradham, K.D.; Casteel, S.W.; Thomas, D.J.; Basta, N.T. Arsenic Speciation of Contaminated Soils/Solid Wastes and Relative Oral Bioavailability in Swine and Mice. Soil Syst. 2018, 2, 27.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Soil Syst. EISSN 2571-8789 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top