title: [A new method of avoiding entrainment swelling in liquid surfactant membrane for the determination of trace Hg(II)].
abstract: Entrainment swelling consists of occlusion swelling and reliquefaction swelling. Entrainment swelling is significant to industrialized liquid surfactant membrane in the process of operation. The present study based on the life-span of W/O emulsion and O/W emulsion discussed the process of forming entrainment swelling. The result shows that no matter what surface-active agent was used, the life-span of W/O emulsion is 20-88 times longer than that of O/W emulsion. After oil drop was dispersed in water, no swelling was discovered, thus, the ratio of swelling is less than that by other method. The new method of determination of trace mercury by avoiding entrainment swelling in liquid surfactant membrane and FAAS is described. The precision(RSD) and recovery are 1.9%-2.3% and 99.8%-101.1% respectively. Hg2+ at ng x g(-1) level can be enriched and determined. This method can be used in the determination of trace mercury in waste water.
authors.affiliation: Department of Chemistry, Changchun Normal College, Changchun 130032, China.
authors.forename: Hui-fen
authors.initials: HF
authors.lastname: Yu
authors.forename: Lin-lin
authors.initials: LL
authors.lastname: Xu
authors.forename: Peng
authors.initials: P
authors.lastname: Ding
mesh_terms: D004655:Emulsions / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008628:Mercury / Q000032:analysis*; D009821:Oils / Q000737:chemistry; D015203:Reproducibility of Results; D013054:Spectrophotometry, Atomic; D013501:Surface-Active Agents / Q000737:chemistry*; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D004655:Emulsions; D009821:Oils; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D014867:Water; D008628:Mercury