Soil degradation of metazachlor and quizalofop-p-ethyl herbicides on TLC plates under natural solar light and dark conditions

The degradation of the herbicides metazachlor (MTZ) and quizalofop-p-ethyl (QZE) was investigated in three different loamy (L) soils on thin-layer chromatography plates under natural solar light and dark conditions. Both herbicides degraded significantly faster under sunlight irradiation. The degrad...

Full description

Saved in:
Bibliographic Details
Published in:International journal of environmental analytical chemistry 2017-05, Vol.97 (7), p.606-622
Main Authors: Mantzos, Nikolaos, Antonopoulou, Maria, Katsoulakou, Stavroula, Hela, Dimitra, Konstantinou, Ioannis
Format: Article
Language:English
Subjects:
Acidic soils
Chromatography
Clay
Clay loam
Clay soils
degradation
Degradation products
Environmental degradation
Half-life
Herbicides
Identification
Ions
Irradiation
Kinetics
Liquid chromatography
Loam
Mass spectrometry
Mass spectroscopy
Metazachlor
Oxalic acid
photolysis
Plates
quizalofop-p-ethyl
Radiation
Soil
Soil conditions
Soil degradation
Soil investigations
Soil layers
Sunlight
Thin layer chromatography
TLC plates
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The degradation of the herbicides metazachlor (MTZ) and quizalofop-p-ethyl (QZE) was investigated in three different loamy (L) soils on thin-layer chromatography plates under natural solar light and dark conditions. Both herbicides degraded significantly faster under sunlight irradiation. The degradation rate of MTZ followed single first-order kinetics, and the determined half-life under sunlight and dark conditions were 18 and 78 days in L soil, 13 and 39 days in silty loam (SL) soil and 15 and 64 days in silty clay loam (SCL) soil, respectively. For QZE, first-order multi-compartment kinetic model fitted better for the description of the degradation rates. The half-life of the herbicide was determined at 0.6 and 2.9 days in L soil, 0.8 and 3.5 days in SL soil and 1.0 and 3.9 days in SCL soil, under sunlight and dark conditions, respectively. The putative degradation products (DPs) of herbicides have been determined by liquid chromatography time-of-flight mass spectrometry. MTZ oxalic acid was identified as the probable major DP of MTZ in the studied soils under sunlight conditions. For QZE three putative DPs were identified in all soils: quizalofop-p-acid and demethylated-quizalofop-p-acid under sunlight and dark conditions, while hydroxy-quizalofop-p-ethyl was detected only in samples under sunlight exposure.
ISSN:0306-7319
1029-0397
DOI:10.1080/03067319.2017.1337109