Decline and sorption of fipronil in four different soil types

Date

4-2004

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Cristina D. Padolina

Abstract

SALVADOR, PHILIP C. College of Arts and Sciences, University of the Philippines Los Banos, April 2004. Decline and Sorption of Fipronil in Four Different Soil Types.

Adviser: Prof. Cristina M. Bajet

Fipronil, 5-amino- 1- (2,6-dichloro- 4- (trifluoromethyl) phenyl- 4- [(1,R,S)- (trifluoromethyl) sulfiny1-1- H-pyrazole-3- carbonitrile, is a highly active broad-spectrum insecticide from the phenyl pyrazole family. The decline and sorption behavior of fipronil in sandy-loam, loam, clay-loam, and clay soil was determined at 75% water holding capacity and under laboratory conditions.

In the decline analysis, fipronil was extracted from soils at different days after the application of the pesticide. The decline of fipronil in the four soils tested followed first-order kinetics. The half-life of fipronil, in increasing order, was 11.9 days in loam, 13.5 days in clay-loam, 16.3 days in sandy-loam, and 24.3 days in clay soil with corresponding rate constant of 0.0579, 0.0513, 0.0426, and 0.0285 day-1.

Percent adsorption of fipronil in different soil types were obtained. The percent adsorption was 84.18 for clay, for 71.60 clay-loam, for 56.93 loam, and 50.57 for sandy-loam. The differences in the amount adsorbed can be attributed to their differences in the soil physico-chemical properties and adsorption was related to the clay mineral and organic matter content of the soil.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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