Effects of DDT and its metabolites on soil algae and enzymatic activity |
| |
Authors: | M. Megharaj H. L. Boul J. H. Thiele |
| |
Affiliation: | (1) Department of Microbiology, University of Otago, Dunedin, New Zealand, NZ;(2) AgResearch, Lincoln, New Zealand, NZ;(3) Waste Solutions Ltd., Box 5775, Dunedin, New Zealand, NZ |
| |
Abstract: | The persistence of DDT [1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane] and its metabolites in soil, their toxicity to soil algae, and effects on microbial activities were studied in laboratory microcosms for 45 days. In non-sterile soils, removal of DDD [1,1-dichloro-2,2-bis(p-chlorophenyl)ethane] and DDE [1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene] was less than 3%, while 4–8% of applied DDMU [1-chloro-2,2-bis(p-chlorophenyl)ethylene], DDA [2,2-bis(p-chlorophenyl)acetic acid] and DDT were lost. Added DDOH [2,2-bis(p-chlorophenyl)ethanol] was more labile, as 60% was degraded during the same period. Soil microalgae were not measurably affected by the compounds tested at 10–50 mg kg–1, but at 100 mg kg–1 soil, DDD, DBP (p,p′-dichlorobenzophenone) and DDA significantly reduced their growth. Phosphatase activity was not affected by DDT and its metabolites at the concentrations tested (≤50 mg kg–1), but all compounds inhibited dehydrogenase activity at concentrations of 50 mg kg–1 soil. The toxic effects of DDT and its metabolites were dose-related. Received: 9 January 1998 |
| |
Keywords: | DDT Metabolites Persistence Toxicity Microalgae Soil enzymes |
本文献已被 SpringerLink 等数据库收录! |
|