1. Lanoline purification by selective extraction of pesticides using supercritical CO2
- Author
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Margenat, Lucía, Torres, Ana I., Moyna, Patrick, Heinzen, Horacio, González, Gabriel, and Jachmanián, Iván
- Subjects
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PEST control , *FACILITY management , *ACARICIDES , *PESTICIDES - Abstract
Abstract: The efficiency of supercritical carbon dioxide for the selective removal of the more important pesticides from commercial lanoline was studied. Lanoline solubility values from 0.03 to 2.50mg/g CO2 were obtained, corresponding to CO2 densities from 498.4 to 857.3kg/m3, respectively. The original lanoline showed the following pesticide profile: diazinon 66ppm, methyl-pirimifos 4.6ppm and ethion 140ppm. By an extraction carried out at 25MPa and 45°C, using a mass ratio solvent to substrate of 19.5g CO2/mg lanoline, only 3.4% of lanoline was co-extracted and the pesticide concentrations were reduced to 0.47ppm for diazinon, less than 20ppb for methyl-pirimifos and 0.2ppm for ethion. These results shows that supercritical CO2 is a very convenient solvent for the selective extraction of the main pesticides from lanoline, without the occurrence of substantial lanoline losses during the process. [Copyright &y& Elsevier]
- Published
- 2008
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