Bubbles in solvent microextraction: the influence of intentionally introduced bubbles on extraction efficiency.
Anal Chem
; 83(17): 6713-6, 2011 Sep 01.
Article
em En
| MEDLINE
| ID: mdl-21749137
ABSTRACT
Significant improvements to microdrop extractions of triazine pesticides are realized by the intentional incorporation of an air bubble into the solvent microdroplet used in this microextraction technique. The increase is attributed partly to greater droplet surface area resulting from the air bubble being incorporated into the solvent droplet as opposed to it sitting thereon and partly to thin film phenomena. The method is useful at nanogram/liter levels (LOD 0.002-0.012 µg/L, LOQ 0.007-0.039 µg/L), is precise (7-12% at 10 µg/L concentration level), and is validated against certified reference materials containing 0.5 and 5.0 µg/L analyte. It tolerates water and fruit juice as matrixes without serious matrix effects. This new development brings a simple, inexpensive, and efficient preconcentration technique to bear which rivals solid phase microextraction methods.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Solventes
/
Ar
Idioma:
En
Revista:
Anal Chem
Ano de publicação:
2011
Tipo de documento:
Article