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Degradation of Trifluralin in Soil Suspensions as Related to Redox Potential
Author(s) -
Willis G. H.,
Wander R. C.,
Southwick L. M.
Publication year - 1974
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1974.00472425000300030016x
Subject(s) - trifluralin , chemistry , degradation (telecommunications) , redox , environmental chemistry , population , soil water , pesticide , environmental science , soil science , agronomy , inorganic chemistry , biology , telecommunications , demography , sociology , computer science
A system for controlling redox potential in soil suspensions was used to investigate the relationship between oxidation‐reduction potential (Eh) and the rate of trifluralin ( a‐a‐a ‐trifluoro‐2,6‐dinitro‐N,N‐dipropyl‐ p ‐toluidine) degradation. Redox potentials of +450, +250, +150, +50, 0, and −50 mV were imposed on trifluralinamended (1 ppm oven‐dry weight soil basis) soil suspensions (100 g soil in 300 ml H 2 O) for 21 days. Results indicated that exclusion of O 2 by soil flooding initiated rapid trifluralin degradation only when the Eh decreased below a critical range between +150 and +50 mV. There was no clear‐cut relationship between trifluralin degradation and microbiological respiratory activity (CO 2 evolution). If soil flooding is to be a practical cultural technique for accelerating the rate of degradation of persistent pesticides, steps may have to be taken to ensure that soil Eh decreases below a critical value for some required period of time. This may include soil incorporation of a readily available carbon or energy source to stimulate an active soil microbial population to enhance lowering of the soil Eh.