Vol. 7, Issue 3 (2019)
An overview on the impact, interaction and fate of xenobiotic-soil organic matter complexes
Author(s): Bidisha Borpatragohain, Subhra Sahoo and Ashish Rai
Abstract: Organic pollutants bound to soil organic matter is of vital importance for the eco-toxicological assessment of pollutants in soil. Many xenobiotic compounds structurally resemble humus constituents and, thereby, may be incorporated into soil organic matter during the humification process. When xenobiotic compounds are bound to soil organic matter, there is a sudden change in its mobility, leaching and bioavailability, including mineralization and uptake by plants and soil faunal population. Several binding mechanisms, viz., physical, physico-chemical, and chemical, are effective between xenobiotics and soil organic matter where most of them being widely unexplored. A number of factors are involved in governing the reactions between xenobiotics and humic substances. Xenobiotics may be bound to high-molecular insoluble humic substances as well as to low-molecular weight, water-soluble ones. The pollutants are apparently detoxified once they are bound to humus. Several researchers have observed that the phytotoxicity of xenobiotics declines in soils having high organic matter content. Other studies specify that xenobiotics bound to humic substances poses delayed health hazard as it can be released later. These pollutants which may subsequently be taken up by plants and agronomic crops may be freed with the help of earthworms and microorganisms. Binding of xenobiotics to humus depends upon the type of xenobiotic introduced into soil and upon its subsequent conversion by microorganisms and abiotic factors. Furthermore, the incorporation of synthetic molecules into organic matter may affect soil structure as well as various microbiological, physicochemical and biochemical soil processes. This review focuses on information regarding xenobiotic’s impact on soil, interaction between xenobiotic and soil organic matter, binding mechanism, factors affecting its interaction, and the ultimate fate of these chemicals in the environment.
Pages: 4935-4941 | 559 Views 215 Downloads
download (5154KB)
How to cite this article:
Bidisha Borpatragohain, Subhra Sahoo, Ashish Rai. An overview on the impact, interaction and fate of xenobiotic-soil organic matter complexes. Int J Chem Stud 2019;7(3):4935-4941.
