The environmental fate of arsenic in surface soil contaminated by historical herbicide application

The Science of the Total Environment
Yongqiang Qi, Rona J Donahoe

Abstract

Soils from many industrial sites are contaminated with arsenic because of the historical application of herbicide containing arsenic trioxide. The strong affinity of aqueous arsenic species for soil components has led to the retention of significant amounts of arsenic in surface soils decades after the original source application. Soil collected from a site which received a one-time surficial application of arsenical herbicide in the 1950s was investigated to understand the fate of arsenic under natural leaching conditions. Sequential chemical extraction of the contaminated soil revealed that the majority of the arsenic is in its secondary form. The synthetic acid rain leaching of arsenic from the weathered soil can be divided into two distinct stages. During the first stage, the leachate arsenic concentration underwent a rapid decline which suggests an equilibrium-controlled release event. The second leaching stage was marked by a slow, steady release of arsenic, a signature of a kinetically controlled process. A mathematical approach was employed to identify and describe the two distinct arsenic releasing processes (equilibrium desorption and kinetic desorption). This model considers both desorption processes simultaneously a...Continue Reading

References

Oct 28, 1999·Journal of Hazardous Materials·J V Bothe, P W Brown
Dec 1, 1989·Environmental Geochemistry and Health·W Hopkin

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Citations

Jan 31, 2015·The Science of the Total Environment·A O'NeillB Sen Gupta
Jun 17, 2010·Ground Water·Yongqiang Qi, Rona J Donahoe
May 10, 2019·Environmental Science and Pollution Research International·Li-Mei CaiJie Luo
Mar 11, 2017·Environmental Science and Pollution Research International·Jose L Marco-BrownMaría Dos Santos Afonso

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