Effect of Fe2+ amendment on photodegradation kinetics of imidacloprid in moist soil View Full Text


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Article Info

DATE

2013-07-24

AUTHORS

Nazia Rafique, Saadia R. Tariq, Mateen Abbas

ABSTRACT

The present study deals with the effect of Fe2+ on degradation kinetics of imidacloprid in moist soil under UV system. The moist soil samples were spiked with imidacloprid and irradiated in specially designed UV-photoreactor. The analysis of imidacloprid was carried out by using HPLC–DAD system. UV irradiation caused about ten fold increase in photodegradation rate of the pesticide. Amendment of soil with Fe2+ at concentrations of 30 mg/kg led to a further increase in the rate of photodegradation, i.e., a 98 % degradation of imidacloprid was observed in the presence of iron after 32 days of irradiation. Moreover, the half-life of imidacloprid in Fe2+-amended soil was observed to be reduced to 7 days that in the absence of Fe2+ was recorded to be 21 days. Iron was also observed to affect the half-life of imidacloprid in dark. When compared with unsterilized Fe2+-amended batch treatments, the t1/2 in sterilized Fe2+-amended batch treatments increased from 58 to 96 days. Imidacloprid-urea was detected by HPLC as the only stable photodegradation byproduct of imidacloprid in the soil. More... »

PAGES

2869-2874

References to SciGraph publications

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URI

http://scigraph.springernature.com/pub.10.1007/s12665-013-2663-x

DOI

http://dx.doi.org/10.1007/s12665-013-2663-x

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https://app.dimensions.ai/details/publication/pub.1026285226


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