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Relative persistence of MCPA, MCPB and mecoprop in Saskatchewan soils, and the identification of MCPA in MCPB‐treated soils
Author(s) -
SMITH ALLAN E.,
HAYDEN BRIAN J.
Publication year - 1981
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1111/j.1365-3180.1981.tb00114.x
Subject(s) - mcpa , mecoprop , chemistry , soil water , persistence (discontinuity) , dicamba , chromatography , agronomy , biology , weed control , ecology , geotechnical engineering , engineering
Summary: The persistence of MCPA, MCPB and mecoprop was compared at the 2 μg g −1 level, under laboratory conditions, in three Saskatchewan soils at 85% of their field capacity moistures and 20 ± 1°C. Following extraction of the soils with aqueous acidic acetonitrile, the methylated extracts were analysed gas chromatographically for herbicides remaining. Breakdown of all three phenoxyalkanoic acids was rapid; the average half‐lives for MCPA, MCPB and mecoprop being < 7, 6 and 8 days, respectively. Degradation in air‐dried soils was minimal. The presence of MCPA as a degradation product of MCPB was confirmed in all moist soils.