Ultrasound assisted-hollow fibre liquid-phase microextraction for the determination of selenium in vegetable and fruit samples by using GF-AAS

2011 ◽  
Vol 124 (4) ◽  
pp. 1673-1677 ◽  
Author(s):  
Kamlesh Shrivas ◽  
Devesh Kumar Patel
Keyword(s):  
Liquid Phase ◽  
Hollow Fibre ◽  
Liquid Phase Microextraction ◽  
Fruit Samples ◽  
Ultrasound Assisted ◽  
Gf Aas

scholarly journals Hollow fibre liquid phase microextraction of parabens

2009 ◽  
Vol 7 (3) ◽  
pp. 285-290 ◽  
Author(s):  
Aleksandra Prichodko ◽  
Kristina Jonusaite ◽  
Vida Vickackaite
Keyword(s):  
Liquid Phase ◽  
Urine Analysis ◽  
Internal Standard ◽  
Correlation Coefficients ◽  
Chromatographic Determination ◽  
Enrichment Factors ◽  
Hollow Fibre ◽  
Liquid Phase Microextraction ◽  
Relative Standard

AbstractA 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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