Decline behavior of imidacloprid (1-[6-chloro-3- pyridyl) methyl]-N- nitroimidazolidin-2- ylideneamine) in three types of soil

Date

4-2003

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Mary Ann O. Torio

Abstract

Imidacloprid, I )6-chloro-3-pyridy I) methyl]-N-nitroimidazolidin-2- ylideneamine, is one of the newly introduced insecticides, which belongs to the choloronicotinyl nitroguanidine class. In this study. the decline behavior of imidacloprid in clay, clay-loam and loam soils were monitored for 3 weeks to investigate the effect of different soil properties in the persistence and degradation behavior of imidacloprid in the soils. Imidacloprid was extracted from the soils at different days after the application of insecticide, and the concentration of the residue was determined using High Pressure Liquid Chromatography (HPLC). The initial rate of degradation of imidacloprid in the soils was adequately described by first order kinetic model. The half-life of degradation was also determined for each soil. It was observed that imidacloprid degraded linter in clay soil (rate = 0.0562 day') than the clay-loam (rate = 0.0241 day-5 and loam soils (rate = 0.0209 day-'), apparently due to the high soil moisture content of the clay soil enhancing hydrolysis and microbial degradation. The half-life of the pesticide showed that imidacloprid was more persistent in loam soil (t,, = 33.2 days) than clay-loam (t,, = 28.8 days) and clay sods it'? = 12.3 days). The persistence in loam soil and clay-loam soil was apparently due to aerobic conditions and high percentage of organic 'natter content in loam soil and dry condition in the clay-loam soil.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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