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Mineralisation and degradation of 2,4‐dichlorophenoxyacetic acid dimethylamine salt in a biobed matrix and in topsoil
Author(s) -
Knight J Diane,
Cessna Allan J,
Ngombe Dean,
Wolfe Tom M
Publication year - 2016
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.4238
Subject(s) - topsoil , dimethylamine , matrix (chemical analysis) , chemistry , environmental chemistry , 2,4 dichlorophenoxyacetic acid , environmental science , soil water , soil science , chromatography , botany , organic chemistry , biology
BACKGROUND Biobeds are used for on‐farm bioremediation of pesticides in sprayer rinsate and from spills during sprayer filling. Using locally sourced materials from Saskatchewan, Canada, a biobed matrix was evaluated for its effectiveness for mineralising and degrading 2,4‐dichlorophenoxyacetic acid dimethylamine salt (2,4‐D DMA ) compared with the topsoil used in the biobed matrix. RESULTS Applying 2,4‐D DMA to the biobed matrix caused a 2–3 day lag in CO 2 production not observed when the herbicide was applied to topsoil. Despite the initial lag, less residual 2,4‐D was measured in the biobed (0%) matrix than in the topsoil (57%) after a 28 day incubation. When the herbicide was applied 5 times to the biobed matrix, net CO 2 increased immediately after each 2,4‐D DMA application. Mineralisation of 2,4‐D DMA was 61.9% and residual 2,4‐D in the biobed matrix was 0.3% after 60 days, compared with corresponding values of 32.9 and 70.9% in topsoil. CONCLUSION The biobed matrix enhanced the mineralisation and degradation of 2,4‐D DMA , indicating the potential for successful implementation of biobeds under Canadian conditions. The biobed matrix was more effective for mineralising and degrading the herbicide compared with the topsoil used in the biobed matrix. By correcting for biobed matrix and formulation blank, CO 2 evolution was a reliable indicator of 2,4‐D DMA mineralisation. © 2016 Society of Chemical Industry