Adsorption of 1,2,4-triazine pesticides metamitron and metribuzin on lignin

The 1,2,4-triazine pesticides, metamitron [4-amino-3-methyl-6-phenyl-1,2,4-triazin-5(4H)-one] and metribuzin [4-amino-3-methylthio-6-tert-butyl-1,2,4-triazin-5(4H)-one] are adsorbed on lignin. The adsorption can be followed by measuring polarographically the concentration of the free pesticide in a...

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Bibliographic Details
Published in:Microchemical journal 2000, Vol.64 (1), p.15-20
Main Authors: Ludvı́k, Jiřı́, Zuman, Petr
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Biological and physicochemical properties of pollutants. Interaction in the soil
Chemistry
Exact sciences and technology
General and physical chemistry
Lignin
Metamitron
Metribuzin
Pesticides
Polarography
Pollution
Soil and sediments pollution
Solid-liquid interface
Surface physical chemistry
Triazines
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Summary:The 1,2,4-triazine pesticides, metamitron [4-amino-3-methyl-6-phenyl-1,2,4-triazin-5(4H)-one] and metribuzin [4-amino-3-methylthio-6-tert-butyl-1,2,4-triazin-5(4H)-one] are adsorbed on lignin. The adsorption can be followed by measuring polarographically the concentration of the free pesticide in a slurry, obtained by dispersing rot-wood lignin in an aqueous buffer (pH 4.9). Analogous measurements of desorption in respective steps indicated that 53% of applied metamitron and 62% of metribuzin are adsorbed irreversibly and cannot be leached over a period of 24 h. Such adsorption decreases the bioavailability of the pesticide.
ISSN:0026-265X
1095-9149
DOI:10.1016/S0026-265X(99)00015-6