Effects of DDT and its metabolites on soil algae and enzymatic activity |
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Authors: | M Megharaj H L Boul J H Thiele |
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Institution: | (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 |
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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 |
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Keywords: | DDT Metabolites Persistence Toxicity Microalgae Soil enzymes |
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