HYDROLYSIS OF PHORATE USING SIMULATED ENVIRONMENTAL-CONDITIONS - RATES, MECHANISMS, AND PRODUCT ANALYSIS

Authors
Citation
F. Hong et S. Pehkonen, HYDROLYSIS OF PHORATE USING SIMULATED ENVIRONMENTAL-CONDITIONS - RATES, MECHANISMS, AND PRODUCT ANALYSIS, Journal of agricultural and food chemistry, 46(3), 1998, pp. 1192-1199
Citations number
44
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Food Science & Tenology",Agriculture,"Chemistry Applied
ISSN journal
0021-8561
Volume
46
Issue
3
Year of publication
1998
Pages
1192 - 1199
Database
ISI
SICI code
0021-8561(1998)46:3<1192:HOPUSE>2.0.ZU;2-9
Abstract
The hydrolysis of phorate, an organophosphorus pesticide, was studied under simulated environmental conditions. Several metal oxides (alumin um hydroxide, hematite, goethite, and ferrihydrite) were chosen to rep resent; the solid phase in natural aquatic systems. Several degradatio n products were identified using GC-MS in combination with wet chemist ry methods. Microtox was used to measure the toxicity of phorate and o ne of the degradation products, diethyl disulfide. Two potential react ion pathways were proposed for the alkaline hydrolysis of phorate that results in unusual products, such as formaldehyde and diethyl disulfi de. No statistically significant catalytic effect was observed for the four metal (hydr)oxides used in the study. However, diethyl disulfide was found to be highly toxic (EC50 is 2.0 ppm) This study again confi rmed the need for the study of the environmental impact of the degrada tion products of pesticides.