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Fate and Toxicity of Endosulfan in Namoi River Water and Bottom Sediment

Alex W. Leonarda, Ross V. Hyneb, Richard P. Lima, Kellie A. Leigha, Jiawei Lea,b,c and Ronald Beckettc

a Dep. of Environmental Sciences, Univ. of Technology-Sydney, located at the Centre for Ecotoxicology, Westbourne Street, Gore Hill, NSW 2065 Australia
b Centre for Ecotoxicology, Westbourne Street, Gore Hill, NSW 2065 Australia
c CRC for Freshwater Ecology and Dep. of Chemistry Water Studies Centre, Monash Univ., Clayton, VIC, Australia



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  		Fig. 1. Relationship between the total endosulfan (sum concentration of {alpha}- and ß-endosulfan plus endosulfan sulfate) and endosulfan sulfate in the overlying water column, with total endosulfan concentrations in the bottom sediment. Both regressions for total endosulfan and endosulfan sulfate were significant (P < 0.01, R2 > 0.98) and violated no linear assumptions.

 


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  		Fig. 2. Changes in the percentage composition of {alpha}-endosulfan, ß-endosulfan, and endosulfan sulfate in the solvent of passive samplers placed in the water column of the Namoi River and bottom sediment samples. All sites were adjacent or downstream of cotton fields. The two vertical arrows on the x axis denote the approximate time of large storm events.

 




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