Degradation Products of Lambda-Cyhalothrin in Aqueous Solution as Determined by SBSE-GC-IT-MS

Journal of the Brazilian Chemical Society

Yariwake, Janete H.¹  Colombo, Renata² 

[1] Universidade de São Paulo, São Carlos, Brazil;Universidade de São Paulo, São Paulo, Brazil

关键词: lambda-cyhalothrin;    water;    chemical oxidative process;    SBSE;    GC-IT-MS.;   

DOI  :  10.21577/0103-5053.20180096

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

Lambda-cyhalothrin is a widely employed pyrethroid insecticide and is potentially toxic to the environment and to human health. Several reports indicate the presence of this insecticide in water samples worldwide, but more data about its behavior in waters and its derivative products are required. This study shows the behavior of the pesticide lambda-cyhalothrin in aqueous solution at different pH and temperature that were simulated by using water contaminated with a toxic concentration of lambda-cyhalothrin and chemical oxidative process. Lambda-cyhalothrin and its derivative products were monitored employing stir bar sorptive extraction (SBSE), using liquid and thermal desorption, combined with gas chromatography coupled with ion trap mass spectrometry (GC-IT-MS) technology. GC-IT-MS enabled the proposal of the lambda-cyhalothrin chemical transformation pathway and the full identification of twelve derivative products. Among them, only 3-phenoxybenzaldehyde is reported as a degradation product of lambda-cyhalothrin, and this compound is an environmental pollutant with endocrine disrupting activity.

【 授权许可】

CC BY