Mobility of Pesticides and Their Hydrolysis Metabolites in Soil

Authors

L. Somasundaram, Iowa State University
Joel R. Coats, Iowa State University
Kenneth D. Racke, Iowa State University
Venkatesh M. Shanbhag, Slippery Rock UniversityFollow

Document Type

Article

Publication Title

Environmental Toxicology and Chemistry

ISSN

0730-7268

Publication Date

2-1991

Keywords

Pesticides, Metabolites, Mobility, Soil thin-layer chromatography

Abstract

The soil thin layer chromatography technique was employed to assess the mobility of 21 chemicals (6 insecticides, 4 herbicides, and 11 of their hydrolysis metabolites) in 6 different soils. The hydrolysis products of the four studied organophosphorus insecticides were significantly more mobile than their parent compounds, but the metabolites of carbamates, s triazines and phenoxy alkanoic acids were less mobile than their parent compounds. For the chemicals for which significant effects of soil variables were observed, greater levels of organic matter, clay, cation exchange capacity and water holding capacity (at one-third bar) lowered the mobility Soil pH significantly affected mobility of many of the chemicals studied, with increased mobility in soils with higher pH values. Both water solubility and octanol/water partition coefficient (K_ow) significantly correlated with the mobility of the chemicals studied, however, K_ow was found to be the better predictor of mobility. No direct relationship existed between the pK_a of the chemicals and their mobility.

DOI

10.1002/etc.5620100206

Volume

10

Issue

2

First Page

185

Last Page

194

Comments

© 1991 SETAC

NSUWorks Citation

Somasundaram, L., Coats, J. R., Racke, K. D., & Shanbhag, V. M. (1991). Mobility of Pesticides and Their Hydrolysis Metabolites in Soil. Environmental Toxicology and Chemistry, 10, (2), 185 - 194. https://doi.org/10.1002/etc.5620100206. Retrieved from https://nsuworks.nova.edu/cnso_chemphys_facarticles/130