HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Booth, G. M. Articles by Hansen, D. J. Search for Related Content PubMed Articles by Booth, G. M. Articles by Hansen, D. J. Agricola Articles by Booth, G. M. Articles by Hansen, D. J.

Fate, Metabolism, and Toxicity of 3-isopropyl-1H-2,1,3-benzothiadiazin-4(3H)-1-2,2-dioxide in a Model Ecosystem¹

ABSTRACT

Bentazon, (3-isopropyl-1H-2,1,3-benzothiadiazin-4(3H)-1-2,2-dioxide) a new experimental herbicide, was studied in a model ecosystem. The radioactivity could not be ether extracted from the water until the solution was acidified with HCl. We believe that HCl may be either releasing the parent material from conjugates or that it simply needs acidification before it can be extracted. The major metabolite found in the water was N-isopropyl anthranilic acid amide, but bentazon was also present in significant amounts. A fresh water crab (Uca minax) contained anthranilic acid, N-isopropyl anthranilic acid, and bentazon.

The aquatic organisms did not accumulate the chemical to any significant degree, although the fresh water crab accumulated it 50 times over the amount found in the water. This was not considered large when compared to DDT.

This compound generally does not pose a threat to aquatic food chains on the basis of toxicity nor metabolism results.

These data are the first to be published on an experimental herbicide and suggest that the model ecosystem can be used as a tool for routine evaluation of herbicide biodegradability.

Key Words: herbicide • bentazon • aquatic ecosystem • food-chain • biomagnification • biodegradable

¹ This research was supported by the Illinois Natural History Survey; Illinois Agr. Exp. Sta.; Biomedical Sciences Committee of the University of Illinois; FWQA Project 16050; Illinois Department of Mental Health Grant 258-11-RD; Illinois Institute for Environmental Quality, and the Rockefeller Foundation.

² Formerly at the Illinois Natural History Survey, Urbana, Ill.; present address, Department of Zoology, Brigham Young University Provo, Utah 84601.

³ Illinois Natural History Survey, Urbana, Ill. 61801.

⁴ Formerly at Illinois Natural History Survey; present address, Monsanto Commercial Products Company, St. Louis, Mo. 63166.

Received for publication August 23, 1972.