Gas-purged headspace liquid phase microextraction system for determination of volatile and semivolatile analytes

In order to achieve rapid,automatic,and efficient extraction for trace chemicals from samples,a system of gas-purged headspace liquid phase microextraction (gp-hs-lpme) has been researched and developed based on the original hs-lpme technique. in this system,semiconductor condenser and heater,whose refrigerating and heating temperatures were controlled by microcontroller,were designed to cool the extraction solvent and to heat the sample,respectively. besides,inert gas,whose gas flow rate was adjusted by mass flow controller,was continuously introduced into and discharged from the system. under optimized parameters,extraction experiments were performed,respectively,using gp-hs-lpme system and original hs-lpme technique for enriching volatile and semivolatile target compounds from the same kind of sample of 15 pahs standard mixture. gc-ms analysis results for the two experiments indicated that a higher enrichment factor was obtained from gp-hs-lpme. the enrichment results demonstrate that gp-hs-lpme system is potential in determination of volatile and semivolatile analytes from various kinds of samples. copyright 2012 meihua zhang et al.