Herbert Paulo, Morais Simone, Paíga Paula, Alves Arminda, Santos Lúcia
Laboratory of Process, Environment and Energy Engineering (LEPAE), Chemical Engineering Department, Engineering Faculty, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal.
Anal Bioanal Chem. 2006 Feb;384(3):810-6. doi: 10.1007/s00216-005-0211-6. Epub 2005 Dec 22.
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, alpha- and gamma-chlordane, p,p'-DDT, heptachlor, heptachlor epoxide isomer A, gamma-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.
