Journal of Environmental Health Sciences (한국환경보건학회지)
- Volume 25 Issue 3
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- Pages.36-43
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- 1999
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- 1738-4087(pISSN)
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- 2233-8616(eISSN)
Determination of Biodegradation Rate on Dichlorvos and Methidathion
Dichlorvos와 methidathion의 생분해율의 측정
- Min, Kyung-Jin (Department of Public Health, College of Natural Science, Keimyung University) ;
- Cha, Chun-Geun (Department of Public Health, College of Natural Science, Keimyung University)
- Published : 1999.09.01
Abstract
The present study was performed to investigate biodegradation rate of dichlorvos and methidathion. In the biodegradation test of two pesticides by the modified river die-away method from June 17 to August 22, 1998, the biodegradation rate constants and half-life were determined in Nakdong(A) and Kumho River(B). Biodegradation rate of dichlorvos was 4.51% in A sampling point, 6.88% in B sampling point after 7 days. Biodegradation rate constants and half-life of dichlorvos were 0.0066 and 105 days in A sampling point, 0.0102 and 67.9 days in B sampling point, respectively. Biodegradation rate of methidathion was 23% in A sampling point, 36% in B sampling point after 7 days. Biodegradation rate constants and half-life of methidathion were 0.0377 and 18.4 days in A sampling point, 0.0641 and 10.8 days in B sampling point, respectively. Biodegradation rate of methidathion was faster than that of dichlorvos. This suggested that the difference in biodegradation of pesticides was due to difference in the water quality and standard plate counts in the Nackdong and Kumho Rivers. The result of correlation analysis between biodegradation rate constants of the pesticides and water quality(DO, BOD, SS, ABS, NH