title: Development of second-generation sample enrichment probe for improved sorptive analysis of volatile organic compounds.
abstract: The sample enrichment probe (SEP) has recently been introduced as a user-friendly and cost-effective method for the sorptive extraction of volatile organic analytes from gaseous and aqueous samples for GC and GC-MS analyses. In a further development of the SEP technique, thinner polydimethylsiloxane (PDMS) tubing on polyimide-coated fused silica, instead of stainless steel rods or stalks, were used to produce the second-generation SEPs. The new SEP does not require widening of the needle-guiding orifice of the septum cap and analytes are desorbed at a faster rate from the thinner sleeve, which reduces the risk of carry-over. The flowless period that was previously recommended for analyses of highly volatile analytes is made redundant by the faster desorption from the thinner sorptive medium. It was found that differences in the thermal histories of SEPs are not the cause of the high relative standard deviations (RSDs) reported in our first paper on the technique. Excellent reproducibility can be attained by careful handling and storing of loaded SEPs and by rigorously following a standardised analytical protocol.
authors.affiliation: Laboratory for Ecological Chemistry, Department of Chemistry and Polymer Science, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa. lecus@sun.ac.za
authors.forename: B V
authors.initials: BV
authors.lastname: Burger
authors.forename: M
authors.initials: M
authors.lastname: le Roux
authors.forename: B
authors.initials: B
authors.lastname: Marx
authors.forename: S A
authors.initials: SA
authors.lastname: Herbert
authors.forename: K T
authors.initials: KT
authors.lastname: Amakali
mesh_terms: D000327:Adsorption; D000438:Alcohols / Q000032:analysis* / Q000302:isolation & purification; D000473:Alkanes / Q000032:analysis / Q000302:isolation & purification; D005591:Chemical Fractionation / Q000295:instrumentation* / Q000379:methods; D004129:Dimethylpolysiloxanes; D008401:Gas Chromatography-Mass Spectrometry; D015203:Reproducibility of Results; D055549:Volatile Organic Compounds / Q000032:analysis* / Q000302:isolation & purification
chemical_list: D000438:Alcohols; D000473:Alkanes; D004129:Dimethylpolysiloxanes; D055549:Volatile Organic Compounds; C013830:baysilon