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Occurrence and Ecological Risks from Fipronil in Aquatic Environments located within Residential Landscapes
作者: Wu, J1; Lu J(吕剑)1; Lu, H1; Lin, YJ1; Wilson, PC2
通讯作者: Wilson, PC (reprint author) Univ Florida, IFAS, Soil & Water Sci Dept, POB 110290, Gainesville, FL 32611 USA.
学科主题: Environmental Sciences & Ecology
关键词: Risk assessment ; Pesticide ; Emerging contaminants ; Endocrine-disrupting chemicals
ISSN号: 0048-9697
发表日期: 2015
卷: 518-519, 期:0, 页:139-147
收录类别: SCI
英文摘要: This study investigated the occurrence of fipronil and its metabolites in aquatic environments in residentially-developed landscapes, including five canals and three retention ponds. Fipronil was detected at four of the sites, with concentrations of 0.5-207.3 ng L-1. Fipronil sulfone and fipronil sulfide were detected at three sampling sites, with concentrations ranging from 0.46 to 57.75 and 0.40-26.92 ng L-1, respectively. Multiple risk assessment methods were performed to characterize potential ecological risks, including deterministic screening and probabilistic risk assessment techniques. The deterministic method indicated no risk to certain biotic groups (i.e. aquatic plants, fish, molluscs, and algae-moss-fungi), but did indicate risks to larval insects and crustaceans. Results from the probabilistic risk assessment indicated significant ecological risks (acute and chronic) ranging from0.75 to 58.9% and 3.9-35.0% when organisms were exposed to the maximumand median concentrations detected, respectively. The potentially affected fraction of species (PAF) likely to be acutely impacted ranged from 4.6 to 8.1% (fipronil), 0.2-1.6% (fipronil sulfone), and 1.9-3.1% (fipronil sulfide) in the ponds with frequent detectable concentrations. The PAF likely to be impacted at chronic toxicity levels ranged from 16.5 to 23.8% for fipronil. Joint probability curve analysis indicated that concentrations exceeded the LC50 of the most sensitive 5% of species 8.5-18.8% of the time at two of the sites with the most frequent detections. Using the more conservative NOEC/LOEC values, there was a 75-78% probability that concentrations were high enough to negatively affect the most sensitive 5% of species at the same two sites, indicating significant risks for chronic toxicity. JPCs indicated a <= 2.6% probability of fipronil sulfone exceeding the LC50 concentrations for the most sensitive 5% of species at the same two sites; and a 4.3-6.8% probability of fipronil sulfide exceeding the LC50 concentrations at the same sites. Results indicate that fipronil and its sulfone and sulfide degradation products may present significant risks to aquatic organisms in some residentially-developed areas.
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作者单位: 1.Univ Florida, IFAS, Indian River Res & Educ Ctr
2.Univ Florida, IFAS, Soil & Water Sci Dept

Recommended Citation:
Wu, J,Lu J,Lu, H,et al. Occurrence and Ecological Risks from Fipronil in Aquatic Environments located within Residential Landscapes. 2015.
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