Distribution and toxicity of current-use insecticides in sediment of a lake receiving waters from areas in transition to urbanization.
Current-use insecticides including organophosphate (OPs) and synthetic pyrethroid (SPs) insecticides were analyzed in 35 sediment samples collected from Chaohu Lake in China, where a transition from a traditional agricultural to a modern urbanized society is ongoing. Total concentrations of five OPs and eight SPs ranged from 0.029 to 0.681 ng/g dry weight and 0.016-301 ng/g dry weight, respectively. Toxic unit analysis showed that 13% of the sediment samples likely produced over 50% of the mortality for benthic invertebrates. Analysis also showed that cypermethrin was the principal contributor to the toxicity. Spatial distribution evaluation implied that OPs were mainly from non-point sources associated with agricultural activities. Conversely, SPs may have been derived from runoff of inflowing rivers through urban regions, as their concentrations were well-correlated with concentrations of other urban-oriented contaminants.
School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China.
Ji-Zhong
JZ
Wang
Hui-Zhen
HZ
Li
Jing
J
You
D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D007306:Insecticides / Q000032:analysis* / Q000633:toxicity; D060106:Lakes / Q000737:chemistry; D010573:Pesticide Residues / Q000032:analysis / Q000633:toxicity; D014507:Urbanization; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000633:toxicity; D014877:Water Pollution, Chemical / Q000706:statistics & numerical data
D007306:Insecticides; D010573:Pesticide Residues; D014874:Water Pollutants, Chemical