Distribution and characteristics of bound residues of prometryn in an organic soil
Uniformly /sup 14/C-ring-labeled prometryn (2-(methylthio)-4,6-bis(isopropylamino)-s-triazine) was incubated with an organic soil under laboratory conditions for 1 year. After exhaustive solvent extraction, the soil containing bound (nonextractable) /sup 14/C-labeled residues was fractionated into humic substances by alkali extraction followed by acid precipitation. A considerable proportion of /sup 14/C-labeled residues in humin and humic acid was comprised of the parent herbicide and its mono-N-dealkylated metabolite. However, the soluble fulvic acid fraction contained an appreciable amount of the 2-hydroxy analogue of prometryn. Thermoanalytical methods were used to obtain information on the nature and location of /sup 14/C-labeled bound residues in soil and humic materials. Exhaustive methylation of humin and humic acid released some of the bound /sup 14/C-labeled residues from these fractions. Bound /sup 14/C-labeled residues in aqueous suspensions of humin or humic acid were stable to UV light. However, UV irradiation of the soil suspension resulted in the release of some of the bound /sup 14/C-labeled residues which were subsequently decomposed to hydroxy analogues.
- Research Organization:
- Agriculture Canada, Ottawa
- OSTI ID:
- 5552142
- Journal Information:
- J. Agric. Food Chem.; (United States), Journal Name: J. Agric. Food Chem.; (United States) Vol. 30:1; ISSN JAFCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AZINES
CARBON 14 COMPOUNDS
CHEMICAL PROPERTIES
CHEMICAL REACTIONS
CONTAMINATION
ELECTROMAGNETIC RADIATION
ENVIRONMENTAL TRANSPORT
EXTRACTION
FULVIC ACIDS
HETEROCYCLIC COMPOUNDS
HUMIC ACIDS
LABELLED COMPOUNDS
MASS TRANSFER
METHYLATION
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PESTICIDES
RADIATIONS
SEPARATION PROCESSES
SOILS
SOLVENT EXTRACTION
TRIAZINES
ULTRAVIOLET RADIATION