Development and validation of a novel method for the analysis of chlorinated pe...

• Author(s): Herbert, Paulo ; Morais, Simone ; Paíga, Paula ; Alves, Arminda ; Santos, Lúcia
• Date: 2006
• Persistent ID: http://hdl.handle.net/10400.22/2979
• Origin: Repositório Científico do Instituto Politécnico do Porto
• Subject(s): Microwave-assisted extraction; Solid phase microextraction; Chlorinated pesticides; Extraction methods; Landfill soil
• Document Type: Article
• Language: English

Description

A new procedure for determining eleven organochlorine pesticides in soils using microwave-assisted extraction (MAE) and headspace solid phase microextraction (HS-SPME) is described. The studied pesticides consisted of mirex, α- and γ-chlordane, p,p’-DDT, heptachlor, heptachlor epoxide isomer A, γ-hexachlorocyclohexane, dieldrin, endrin, aldrine and hexachlorobenzene. The HS-SPME was optimized for the most important parameters such as extraction time, sample volume and temperature. The present analytical procedure requires a reduced volume of organic solvents and avoids the need for extract clean-up steps. For optimized conditions the limits of detection for the method ranged from 0.02 to 3.6 ng/g, intermediate precision ranged from 14 to 36% (as CV%), and the recovery from 8 up to 51%. The proposed methodology can be used in the rapid screening of soil for the presence of the selected pesticides, and was applied to landfill soil samples.