Detection of methanol in wine by microwave spectroscopy

Kitchin, R.W.; Willis, Robert E.; Cook, Robert L.

doi:10.1021/ac00231a012

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…Lacking sharp structure, these spectra do not permit the identification of chemical species (as in, for example, Kitchin, Willis, & Cook, 1981), thus a system calibrated to monitor the content of a particular food might not detect the unexpected presence of completely foreign material. Such smooth spectral shapes however, can be well characterized with many fewer frequency steps than the 191 used in this study, simplifying the instrumentation required.…”

Section: Resultsmentioning

confidence: 99%

Dielectric study of milk for frequencies between 1 and 20GHz

Nunes

Bohigas

Tejada

2006

Journal of Food Engineering

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Section: Resultsmentioning

confidence: 99%

Dielectric study of milk for frequencies between 1 and 20GHz

Nunes

Bohigas

Tejada

2006

Journal of Food Engineering

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A light-modulated chemosensor for methanol with ratiometry and colorimetry

Zhang

Chen

2009

Analytica Chimica Acta

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Laser-Enhanced Ionization Detection of Pb in Seawater by Flow Injection Analysis with On-Line Preconcentration and Separation

Lin

1999

Anal. Chem.

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The flame laser-enhanced ionization (LEI) technique is coupled with the flow injection analysis system to measure the trace lead amounts in aqueous solution and in seawater. The flow injection (FI) manifold is incorporated with a microcolumn packed with a C18 bonded silica. The chelating agent DDPA is used to form the Pb-DDPA complex, which may be sorbed in the microcolumn and then eluted with methanol. The preconcentrated Pb is then detected by the LEI technique with either single-step or two-step excitation. At 5- and 15-mL volume-fixed sample loading, the detection limits of 0.011 and 0.0033 ng/mL (11 and 3.3 ppt) and enrichment factors of 16 and 48 are achieved, respectively, using a two-step FI-LEI. The sensitivity of the current system proves to be better by at least 1 order of magnitude than that of conventional LEI method. The FI-LEI also increases the tolerance of matrix interference. The LEI signal is slightly reduced to 80% intensity as 10,000 micrograms/mL (ppm) Na and K matrixes are mixed in the lead solution. The resistance to the alkali matrixes is enhanced approximately 4 times that reported previously using a similar water-immersed probe as a LEI collector. Finally, the FI-LEI is for the first time applied to detect the Pb content in seawater, achieving a result of 0.0112 +/- 0.0006 ng/mL (ppb) consistent with the certified value of 0.013 +/- 0.005 ng/mL (ppb).

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Detection of methanol in wine by microwave spectroscopy

Cited by 3 publications

References 9 publications

Dielectric study of milk for frequencies between 1 and 20GHz

Dielectric study of milk for frequencies between 1 and 20GHz

A light-modulated chemosensor for methanol with ratiometry and colorimetry

Laser-Enhanced Ionization Detection of Pb in Seawater by Flow Injection Analysis with On-Line Preconcentration and Separation

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