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Disappearance rates of chlorothalonil (TCIN) in the aquatic environment

Davies, PE (1988) Disappearance rates of chlorothalonil (TCIN) in the aquatic environment. Bulletin of Environmental Contamination and Toxicology, 40 (3). pp. 405-409. ISSN 0007-4861 (Print) 1432-0800 (Online)

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Chlorothalonil (TCIN) is a chlorinated isopthalonitrile fungicide with low water solubility. It is highly toxic to fish with 96h-LC50 values in the range 10 - 30 micro g/L, and is rapidly metabolised to glutathione conjugates. It is released into streams at low total concentrations after agricultural spraying operations. A series of experiments were performed using TCIN and 14C-TCIN in aqueous solutions from different sources, at different temperatures and with different stream substrates, in order or evaluate the nature and rates of TCIN disappearance and the appearance of polar derivatives of TCIN (DTCIN) in the aquatic environment.
Results indicate that TCIN is readily biodegraded at low concentrations and cannot be regarded as a persistent pollutant. The log octanol-water partition coefficient was 4.38 (SD 0.12). Concentration decline was much greater at 15 deg C than 5 deg C, with a Q10 of 1.8. Analysis of suspended material contaminated with TCIN demonstrated significant binding to suspended material with an average log partition coefficient of 5.97, and with an average of 81% of total TCIN being bound to suspended matter. Periphyton (aufwuchs) on stones greatly increased the rate of decline in water column concentrations.

Item Type: Article
Authors/Creators:Davies, PE
Keywords: chlorothalanil, TCIN, aquatic, freshwater
Journal or Publication Title: Bulletin of Environmental Contamination and Toxicology
Page Range: pp. 405-409
ISSN: 0007-4861 (Print) 1432-0800 (Online)
Identification Number - DOI: 10.1007/BF01689098
Date Deposited: 15 Dec 2006
Last Modified: 16 Mar 2011 02:39
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