Dissipation of 2,4-D glyphosate and paraquat in river water
Journal
Water, Air & Soil Pollution
Journal Volume
72
Journal Volume
72
Journal Issue
1-4
Journal Issue
1-4
Pages
1-7
Start Page
1
End Page
7
ISSN
15732932
Date Issued
1994-01
Author(s)
Abstract
Dissipation of herbicides in river water was determined by adding different concentrations of 2,4-D, glyphosate and paraquat to samples of river water. A small variation of dissipation of radioactivity for14C-2,4-D in higher and lower concentrations and in different samples of river water was found. But about half the radioactivity disappeared from water samples of original glyphosate concentration at 100 mg L-1 and, in the case of 100 μg L-1, only 11 to 22% remained in the samples of river water after 56 d incubation except the sample from Hsin-Tien River. More than 80% of paraquat remained in water samples. Determination of octanol-water partition coefficient (Kow) showed a large difference in amounts of 2,4-D partitioned in water phase at different pH values, 97.4% at the higher pH of ionic state and 5.2% at the lower pH of molecular state, implying that pH value of water might affect the bioaccumulation process of 2,4-D. The result showed that 95.0% of glyphosate present in water phase in ionic form (higher pH) and 82.3% in molecular form (lower pH), indicating that glyphosate might have no affect on the biomagnification, since most of glyphosate could be excreted with water by organisms.
SDGs
Publisher
Kluwer Academic Publishers
Type
journal article