ANALYSIS OF DIMETHOATE AND DIAZINON PESTICIDE RESIDUES IN SOIL BY GAS CHROMATOGRAPHY
Abstract
- Pesticides are shown to have a great effect on soil organisms, but the effect varies with pesticide group and concentration, and is modified by soil organic carbon content and soil texture. Dimethoate and diazinon pesticide residues in soil under pesticide-treated plants were detected by use of high resolution gas chromatography equipped with phosphorus flame photometric detector (GC-PFPD). The residue concentrations in the soil were related to their physicochemical properties. Diazinon exhibited the higher concentration in the soil under pesticide-treated plants areas (0.3764 ppm, 2 h after application), while dimethoate was found at lower concentration (0.3169 ppm). All two pesticides were accumulated in soil sample during the first 24 h after application but the dimethoate concentrations rapidly decreased to 97.79 % after application for 5 days, while diazinon residues decreased to 98.51 % at the end of the 7 days monitoring period. The rate constants and half-lives of double exponential decay model and pseudo-first order equations in soil under pesticide-treated plots were determined.
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Year
- 2020
Author
-
Ohnmar Aung
Subject
- Chemistry
Publisher
- Myanmar Academy of Arts and Science (MAAS)