Journal
ANALYTICAL CHEMISTRY
Volume 83, Issue 17, Pages 6713-6716Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac201323z
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Funding
- University of Johannesburg
- THRIP
- NRF
- Cannon Collins Trust
- National University of Lesotho
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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 mu g/L, LOQ 0.007-0.039 mu g/L), is precise (7-12% at 10 mu g/L concentration level), and is validated against certified reference materials containing 0.5 and 5.0 mu g/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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