PMID: 18409614Apr 16, 2008Paper

Adsorption thermodynamics of p-arsanilic acid on iron (oxyhydr)oxides: in-situ ATR-FTIR studies

Environmental Science & Technology
Sarah DepalmaHind A Al-Abadleh

Abstract

The organoarsenical p-arsanilic acid (p-AsA) is used in the U.S. poultry industry as a feed additive and its structure resembles one of the stable biodegradation products of Roxarsone (ROX) in anaerobic environments. With the implementation of recent EPA MCL of total arsenic in drinking water (10 ppb), thereareconcernsaboutthefate of organoarsenicals introduced to the environment through the application of arsenic-contaminated manure. We report herein, for the first time, the thermodynamics of p-AsA binding to Fe-(oxyhydr)oxides using ATR-FTIR. ATR-FTIR spectra were used to quantify surface coverage of p-AsA, p-AsA(ads), by analyzing the broadband assigned to v(As-O) at 837 cm(-1). Adsorption isotherms were measured in situ at 298 K and pH 7 in the concentration range 1 microM to 40 mM. Values of Keq were obtained from Langmuir model fits and they range from 1411 to 3228 M(-1). We also determined the maximum adsorption capacities of Fe-(oxyhydr)oxides to p-AsA, and they range from 1.9 x 10(13) to 2.6 x 10(13) molecules/cm2. Our results suggest that p-AsA is more mobile than methylated and inorganic forms of arsenic and that the transport of nanoparticles with p-AsA(ads) might play a role in its mobility in geochemical environme...Continue Reading

References

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Citations

Jun 15, 2012·Journal of Hazardous Materials·Wan-Ru Chen, Ching-Hua Huang
Jan 5, 2011·Journal of Hazardous Materials·Uriel Arroyo-AbadRainer Wennrich
Dec 18, 2013·Chemosphere·Haibo LiuRay L Frost
Dec 3, 2014·Environment International·Kiranmayi P MangalgiriLee Blaney
Jul 14, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Michael P Schmidt, Carmen Enid Martínez
Nov 25, 2020·The Science of the Total Environment·Xiande Xie, Hefa Cheng
Jun 19, 2009·Environmental Science & Technology·Matthew ChabotHind A Al-Abadleh
Feb 21, 2013·The Journal of Physical Chemistry. a·Derek ArtsHind A Al-Abadleh
Nov 13, 2018·The Journal of Physical Chemistry. a·Shuyu XuJohn F Rabolt
Jan 20, 2012·The Journal of Physical Chemistry. a·Julia Tofan-Lazar, Hind A Al-Abadleh
Feb 14, 2015·Environmental Science & Technology·Lingling Wang, Hefa Cheng
Aug 21, 2021·Environmental Science and Pollution Research International·Jing XuXiang Zhang
Oct 15, 2021·Chemical Society Reviews·Yingping PangZongping Shao

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