Fate of the Benzimidazole Antiparasitics Flubendazole and Fenbendazole in Manure and Manured Soils
The fate of flubendazole and fenbendazole in manure and manured soils was investigated under laboratory and field conditions. In pig manure, both 14C‐labeled benzimidazoles disappeared slowly. After a 102 day incubation period, extractable fractions contained 72% flubendazole or 80% fenbendazole of...
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Published in | Clean : soil, air, water Vol. 35; no. 5; pp. 488 - 494 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Weinheim
WILEY-VCH Verlag
01.11.2007
WILEY‐VCH Verlag |
Subjects | |
Online Access | Get full text |
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Summary: | The fate of flubendazole and fenbendazole in manure and manured soils was investigated under laboratory and field conditions. In pig manure, both 14C‐labeled benzimidazoles disappeared slowly. After a 102 day incubation period, extractable fractions contained 72% flubendazole or 80% fenbendazole of the radioactivity initially applied. The latter was accompanied by 4% of the corresponding metabolite fenbendazole‐sulfoxide. Non‐extractable residues amounted to 24 and 13%, respectively. On this basis, test manures with 7 day aged benzimidazole residues were prepared. Mobility tendencies differed for clay and sand soils as well as for standard and test‐manure application. Regarding KOC > 1100 L/kg, however, criteria for potential leachers were not fulfilled. The metabolic fate of flubendazole was predominated by the occurrence of the parent compound while fenbendazole was accompanied by fenbendazole‐sulfoxide. In clay soil samples after standard application, DT50 values were 174 and 54 days, respectively. Mineralization and formation of non‐extractable residues were of minor relevance. For fenbendazole, these processes were intensified after test‐manure application. Due to enhanced formation of fenbendazole‐sulfoxide, fenbendazole‐sulfone, and non‐extractable residues, DT50 thus dropped to 9 days. Similar mobility and degradability tendencies were also found under field conditions. In the sand soil, however, the metabolic dynamics decelerated due to its lower microbial activity. |
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Bibliography: | ark:/67375/WNG-MK6836H1-F German Federal Environment Agency - No. UBA-FKZ 202 67 435 ArticleID:CLEN200720023 istex:766D301A390050CA8FBE7DB643334EC4125210B0 Dedicated to Prof. Dr. mult. Dr. h. c. Müfit Bahadir on the occasion of his 60th birthday birthday Dedicated to Prof. Dr. mult. Dr. h. c. Müfit Bahadir on the occasion of his 60 th ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 1863-0650 1863-0669 |
DOI: | 10.1002/clen.200720023 |