TY - JOUR
T1 - Headspace hollow fiber protected liquid-phase microextraction combined with gas chromatography-mass spectroscopy for speciation and determination of volatile organic compounds of selenium in environmental and biological samples
AU - Ghasemi, Ensieh
AU - Sillanpää, Mika
AU - Najafi, Nahid Mashkouri
PY - 2011/1/21
Y1 - 2011/1/21
N2 - A simple and novel speciation method for the determination of volatile organic compounds of selenium (dimethylselenide (DMSe) and dimethyldiselenide (DMDSe) has been developed using a headspace hollow fiber protected liquid-phase microextraction (HS-HF-LPME) combined with capillary gas chromatography-mass spectrometry (GC-MS). The organic solvent impregnated in the pores and filled inside the porous hollow fiber membrane was used as an extraction interface in the HS-HF-LPME of the compounds. The effect of different variables on the extraction efficiency was studied simultaneously using an experimental design. The variables of interest in the HS-HF-LPME were sample volume, extraction time, temperature of sample solution, ionic strength, stirring rate and dwelling time. A Plackett-Burman design was performed for screening in order to determine the significant variables affecting the extraction efficiency. Then, the significant factors were optimized by a Box-Behnken design (BBD) and the response surface equations were derived. Under optimum conditions, preconcentration factors up to 1250 and 1170 were achieved for DMSe and DMDSe respectively. The detection limit and relative standard deviation (RSD) (n=5, c=50μgL-1) for DMSe were 65ngL-1 and 4.8%, respectively. They were also obtained for DMDSe as 57ngL-1 and 3.9%, respectively. The developed technique was found to be applicable to spiked environmental and biological samples.
AB - A simple and novel speciation method for the determination of volatile organic compounds of selenium (dimethylselenide (DMSe) and dimethyldiselenide (DMDSe) has been developed using a headspace hollow fiber protected liquid-phase microextraction (HS-HF-LPME) combined with capillary gas chromatography-mass spectrometry (GC-MS). The organic solvent impregnated in the pores and filled inside the porous hollow fiber membrane was used as an extraction interface in the HS-HF-LPME of the compounds. The effect of different variables on the extraction efficiency was studied simultaneously using an experimental design. The variables of interest in the HS-HF-LPME were sample volume, extraction time, temperature of sample solution, ionic strength, stirring rate and dwelling time. A Plackett-Burman design was performed for screening in order to determine the significant variables affecting the extraction efficiency. Then, the significant factors were optimized by a Box-Behnken design (BBD) and the response surface equations were derived. Under optimum conditions, preconcentration factors up to 1250 and 1170 were achieved for DMSe and DMDSe respectively. The detection limit and relative standard deviation (RSD) (n=5, c=50μgL-1) for DMSe were 65ngL-1 and 4.8%, respectively. They were also obtained for DMDSe as 57ngL-1 and 3.9%, respectively. The developed technique was found to be applicable to spiked environmental and biological samples.
KW - GC
KW - Gas chromatography
KW - Head space
KW - Hollow fiber
KW - Selenium
UR - http://www.scopus.com/inward/record.url?scp=78650736471&partnerID=8YFLogxK
U2 - 10.1016/j.chroma.2010.12.005
DO - 10.1016/j.chroma.2010.12.005
M3 - Article
C2 - 21185031
AN - SCOPUS:78650736471
SN - 0021-9673
VL - 1218
SP - 380
EP - 386
JO - Journal of Chromatography A
JF - Journal of Chromatography A
IS - 3
ER -