PRECONCENTRATION OF TRACE ZINC IN SEAWATER ON CPPI RESIN BY FIA AND ON-LINE DETECTION BY ICP-AFS

A quite new type of chelating resin CarboxymethylatedPolyethylenimine-Polymethylenepolyphenylene Isocyanate(CPPI)is usedfor the preconcentration of Zn from high salt water such as seawater.The preconcentration is controlled through the technique of FlowInjection Analysis(FIA).The concentrated sample solution is thendirectly transferred to an Inductively Coupled Plasma-AtomicFluorescence Spectrometer(ICP-AFS)for determination.The detectionlimit of Zn by the technique is about 0.06 ppb.