title: Automated two-column ion exchange system for determination of the speciation of trace metals in natural waters.
abstract: A rapid method for determination of metal speciation based on an automated two-column ion exchange system is described. Two fractions of dissolved trace metal species are directly determined by on-line flame atomic absorption spectrophotometry after preconcentration by sequential columns of Chelex-100 chelating resin and AG MP-1 macroporous anion resin. A third fraction is determined by standard addition. Variables that affect the results obtained by the two-column system are studied by the use of model complexing agents. With a 10-mL sample loop, the sample throughput is 6 samples per hour and detection limits are 0.1 micrograms/L for Cu(II), 0.08 micrograms/L for Cd(II), and 0.2 micrograms/L for Zn(II). The method is used to determine the speciation of Cu(II), Cd(II), and Zn(II) in natural water samples.
authors.forename: Y
authors.initials: Y
authors.lastname: Liu
authors.forename: J D
authors.initials: JD
authors.lastname: Ingle
mesh_terms: D002852:Chromatography, Ion Exchange / Q000295:instrumentation; D006863:Hydrogen-Ion Concentration; D008670:Metals / Q000032:analysis*; D014873:Water Pollutants / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D008670:Metals; D014873:Water Pollutants; D014874:Water Pollutants, Chemical