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Polyaniline-polypyrrole coating for solid phase microextraction

100%

Vickackaite V., Ciuvasovaite V.

Open Chemistry

2007

vol. 5

issue 3

727-738

A procedure for direct electrochemical deposition of polyaniline-polypyrrole blend coating on the surface of stainless steel wire was suggested. Incorporation of polyaniline and polypyrrole into the blend coating was confirmed by infrared spectroscopy. Key parameters (pyrrole, aniline, dopant and sulphuric acid concentrations and deposition potential) influencing the coating’s mechanical stability and surface homogeneity were optimised and thermostability of the coating was investigated. A possibility to apply the coating as a new fibre for solid phase microextraction was demonstrated. The coating showed better selectivity toward aromatic, hydrophobic compounds. [...]

Hollow fibre liquid phase microextraction of parabens

81%

Prichodko A., Jonusaite K., Vickackaite V.

Open Chemistry

2009

vol. 7

issue 3

285-290

A hollow fibre liquid phase microextraction for gas chromatographic determination of some p-hydroxybenzoic acid esters has been developed. Chlorobenzene containing tetradecane as internal standard was used for the extraction. Optimized extraction was carried out at room temperature for 40 min in the presence of 0.4 g mL−1 NaCl in the sample solution. Calibration was linear up to 30 mg L−1. Correlation coefficients were 0.996–0.998. Enrichment factors were 21, 95 and 154, and detection limits were 0.20, 0.03 and 0.01 μg mL−1 for methylparaben, ethylparaben and propylparaben, respectively. Reproducibility was acceptable with relative standard deviations up to 11.7%. The technique was tested for water and urine analysis. [...]

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2 Open Chemistry

1 2009

1 2007

2 Vickackaite V.

1 Ciuvasovaite V.

1 Jonusaite K.

1 Prichodko A.

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Polyaniline-polypyrrole coating for solid phase microextraction

Hollow fibre liquid phase microextraction of parabens