Sorption-Desorption, Degradation and Leaching of Napropamide in Selected Malaysian Soils

Sorption, degradation and leaching are the important processes affecting fates of pesticides in the soil environment. Sorption influences the magnitude of the other processes and is considered to be one of the major processes affecting the interactions occurring between pesticides and the solid phas...

Full description

Saved in:

Bibliographic Details
Main Author:	Sadegh Zadeh, Fardin
Format:	Thesis
Language:	English English
Published:	2010
Subjects:	Soil absorption and adsorption - Malaysia Soils - Leaching - Malaysia Soil degradation - Malaysia
Online Access:	http://psasir.upm.edu.my/id/eprint/19526/1/FP_2010_30.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-upm-ir.19526
record_format	uketd_dc
spelling	my-upm-ir.195262013-04-01T04:32:18Z Sorption-Desorption, Degradation and Leaching of Napropamide in Selected Malaysian Soils 2010-09 Sadegh Zadeh, Fardin Sorption, degradation and leaching are the important processes affecting fates of pesticides in the soil environment. Sorption influences the magnitude of the other processes and is considered to be one of the major processes affecting the interactions occurring between pesticides and the solid phase in the soil environment. Dissipation of pesticides can occur by degradation and leaching. There is no reported study on napropamide fates in Malaysian soils or even in tropical soils. Napropamide is one of the pre-emergence herbicides used to control several grasses and broadleaf weeds in tobacco and kenaf fields in Malaysia. Sorption-desorption, degradation and leaching of napropamide were studied in selected Malaysian soils and Baging soil amended with chicken dung (CD) and palm oil mill effluent (POME). The ability of a UV-spectrophotometry to determine napropamide concentration in soil sorption study was studied as well. Results showed that UV-spectrophotometry method was as reliable as the HPLC in determining napropamide concentration in the supernatant of batch equilibrium sorption study. Interference by dissolved organic carbon in the napropamide determination by the spectrophotometer method could be easily corrected using a dual beam spectrophotometer. Baging soil has very low affinity for napropamide. The sorption capacity (Kf) of Baging soil and Baging soil amended with 80 Mg ha-1 CD and POME were 0.22, 41.6 and 3.96, respectively. Dissolved organic carbon (DOC) derived from CD or POME did not affect sorption capacity of amended Baging soil. The sorption capacities of the selected Malaysian soils for napropamide were in the following order: Linau (Kf = 66.2) > Teringkap (Kf = 56) > Gunung Berinchang (Kf = 43) > Jambu (Kf = 26) > Rudua (Kf = 8) > Baging soil (Kf = 0.22). The results indicated that sorption increased with increasing clay and organic carbon content (OC) of the soils. Among the BRIS soils studied, the Baging which has the lowest organic matter and clay content, also has the lowest Kf. Napropamide half-life was lowest in the Baging soil (43 d) and its half-life was increased to 69 (d) and 49.5 (d) with the addition of 20 Mg ha-1 CD and POME, respectively. Degradation of napropamide decreased in Baging soil receiving DOC derived from CD and POME. The shortest and longest half-lives among the selected Malaysian soils were observed in Baging (43 d) and Linau soil (100 d), respectively. The results indicated that napropamide degradation decreased with the increasing soil sorption capacity. Napropamide was leached out earlier in the Baging soil as compared to the other soils. The results showed that soils which have low sorption capacities for napropamide leached napropamide earlier from the soil column. On the other hand, for Linau soil which had the highest sorption capacity for napropamide (Kf = 66.2), no napropamide was detected in the leachate even after seven pore volumes of effluent water. The results also suggested that DOC did not affect the leaching of napropamide. Overall, application of napropamide in the selected Malaysian soils would not pose a threat to the environment especially the groundwater except in soil with low organic matter and clay content, and high hydraulic conductivity such as the Baging soil. Soil absorption and adsorption - Malaysia Soils - Leaching - Malaysia Soil degradation - Malaysia 2010-09 Thesis http://psasir.upm.edu.my/id/eprint/19526/ http://psasir.upm.edu.my/id/eprint/19526/1/FP_2010_30.pdf application/pdf en public phd doctoral Universiti Putra Malaysia Soil absorption and adsorption - Malaysia Soils - Leaching - Malaysia Soil degradation - Malaysia Faculty of Agriculture English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Soil absorption and adsorption - Malaysia Soils - Leaching - Malaysia Soil degradation - Malaysia
spellingShingle	Soil absorption and adsorption - Malaysia Soils - Leaching - Malaysia Soil degradation - Malaysia Sadegh Zadeh, Fardin Sorption-Desorption, Degradation and Leaching of Napropamide in Selected Malaysian Soils
description	Sorption, degradation and leaching are the important processes affecting fates of pesticides in the soil environment. Sorption influences the magnitude of the other processes and is considered to be one of the major processes affecting the interactions occurring between pesticides and the solid phase in the soil environment. Dissipation of pesticides can occur by degradation and leaching. There is no reported study on napropamide fates in Malaysian soils or even in tropical soils. Napropamide is one of the pre-emergence herbicides used to control several grasses and broadleaf weeds in tobacco and kenaf fields in Malaysia. Sorption-desorption, degradation and leaching of napropamide were studied in selected Malaysian soils and Baging soil amended with chicken dung (CD) and palm oil mill effluent (POME). The ability of a UV-spectrophotometry to determine napropamide concentration in soil sorption study was studied as well. Results showed that UV-spectrophotometry method was as reliable as the HPLC in determining napropamide concentration in the supernatant of batch equilibrium sorption study. Interference by dissolved organic carbon in the napropamide determination by the spectrophotometer method could be easily corrected using a dual beam spectrophotometer. Baging soil has very low affinity for napropamide. The sorption capacity (Kf) of Baging soil and Baging soil amended with 80 Mg ha-1 CD and POME were 0.22, 41.6 and 3.96, respectively. Dissolved organic carbon (DOC) derived from CD or POME did not affect sorption capacity of amended Baging soil. The sorption capacities of the selected Malaysian soils for napropamide were in the following order: Linau (Kf = 66.2) > Teringkap (Kf = 56) > Gunung Berinchang (Kf = 43) > Jambu (Kf = 26) > Rudua (Kf = 8) > Baging soil (Kf = 0.22). The results indicated that sorption increased with increasing clay and organic carbon content (OC) of the soils. Among the BRIS soils studied, the Baging which has the lowest organic matter and clay content, also has the lowest Kf. Napropamide half-life was lowest in the Baging soil (43 d) and its half-life was increased to 69 (d) and 49.5 (d) with the addition of 20 Mg ha-1 CD and POME, respectively. Degradation of napropamide decreased in Baging soil receiving DOC derived from CD and POME. The shortest and longest half-lives among the selected Malaysian soils were observed in Baging (43 d) and Linau soil (100 d), respectively. The results indicated that napropamide degradation decreased with the increasing soil sorption capacity. Napropamide was leached out earlier in the Baging soil as compared to the other soils. The results showed that soils which have low sorption capacities for napropamide leached napropamide earlier from the soil column. On the other hand, for Linau soil which had the highest sorption capacity for napropamide (Kf = 66.2), no napropamide was detected in the leachate even after seven pore volumes of effluent water. The results also suggested that DOC did not affect the leaching of napropamide. Overall, application of napropamide in the selected Malaysian soils would not pose a threat to the environment especially the groundwater except in soil with low organic matter and clay content, and high hydraulic conductivity such as the Baging soil.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Sadegh Zadeh, Fardin
author_facet	Sadegh Zadeh, Fardin
author_sort	Sadegh Zadeh, Fardin
title	Sorption-Desorption, Degradation and Leaching of Napropamide in Selected Malaysian Soils
title_short	Sorption-Desorption, Degradation and Leaching of Napropamide in Selected Malaysian Soils
title_full	Sorption-Desorption, Degradation and Leaching of Napropamide in Selected Malaysian Soils
title_fullStr	Sorption-Desorption, Degradation and Leaching of Napropamide in Selected Malaysian Soils
title_full_unstemmed	Sorption-Desorption, Degradation and Leaching of Napropamide in Selected Malaysian Soils
title_sort	sorption-desorption, degradation and leaching of napropamide in selected malaysian soils
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Agriculture
publishDate	2010
url	http://psasir.upm.edu.my/id/eprint/19526/1/FP_2010_30.pdf
_version_	1747811403209637888

Sorption-Desorption, Degradation and Leaching of Napropamide in Selected Malaysian Soils

Similar Items