title: Synthesized mercaptopropyl nanoporous resins in DGT probes for determining dissolved mercury concentrations.
abstract: 3-Mercaptopropyl functionalized SBA-15 (SH-SBA) and 3-mercaptopropyl functionalized ethenylene bridged periodic mesoporous organosilica (SH-PMO) were included in a Diffusive Gradients in Thin film (DGT) probe and compared to similar commercially available resins also containing thiol functional groups, such as Sumichelate Q10R (SQR) and 3-mercaptopropyl functionalized silica gel (SH-KG), and also to the Chelex-100 resin for the determination of labile Hg concentrations. An agarose gel was used as the diffusive gel because the classic polyacrylamide gel shows more than 20% of Hg adsorption. According to our results, the Chelex-100 resin presents a much lower affinity for Hg than the thiol based resins. The non-linear accumulation profile of mercury with time for the Chelex-100 resin makes it in fact impossible to use Fick's law for estimating the diffusion coefficient of Hg. The 4 other resins all show a linear accumulation profile of Hg with time. Although the highest accumulation rate is observed for SH-PMO followed by SQR, SH-SBA and SH-KG, these values do not differ very much.
authors.affiliation: Department of Analytical and Environmental Chemistry (ANCH), Vrije Universiteit Brussel (VUB), Brussels, Belgium. yuegao@vub.ac.be
authors.forename: Yue
authors.initials: Y
authors.lastname: Gao
authors.forename: Els
authors.initials: E
authors.lastname: De Canck
authors.forename: Martine
authors.initials: M
authors.lastname: Leermakers
authors.forename: Willy
authors.initials: W
authors.lastname: Baeyens
authors.forename: Pascal
authors.initials: P
authors.lastname: Van Der Voort
mesh_terms: D000327:Adsorption; D004058:Diffusion; D004784:Environmental Monitoring / Q000379:methods; D008628:Mercury / Q000302:isolation & purification*; D049329:Nanostructures / Q000737:chemistry*; D061005:Ponds / Q000032:analysis; D016062:Porosity; D012117:Resins, Synthetic / Q000138:chemical synthesis / Q000737:chemistry*; D012822:Silicon Dioxide / Q000138:chemical synthesis / Q000737:chemistry*; D013438:Sulfhydryl Compounds / Q000138:chemical synthesis / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D012117:Resins, Synthetic; C509969:SBA-15; D013438:Sulfhydryl Compounds; D014874:Water Pollutants, Chemical; C024997:Chelex 100; D012822:Silicon Dioxide; D008628:Mercury