title: High performance liquid chromatographic determination of aluminium in natural waters in the form of its lumogallion chelate.
abstract: A high performance liquid chromatographic method for the determination of ultra trace amount of aluminium in natural waters has been developed using lumogallion as a precolumn reagent for fluorimetric detection. The highly fluorescent Al-lumogallion chelate (lambda(ex) 500 nm, lambda(em) 574 nm) was separated on a LiChrosorb RP 18 column with an eluent containing 3:7 acetonitrile/0.02M potassium hydrogen phthalate buffer (pH 4.7) containing 10(-5)M lumogallion. The proposed system provides a simple, quick, selective and sensitive method for the determination of ultra-trace amount of aluminium in water samples. The detection limit defined as three times the standard deviation of the blank signal, was 0.05 mug/l. in water samples for 100 mul injection. The tolerance limits were 5 mg/l. for Fe(III) and F(-) and over 10 mg/l. for other foreign ions. The sensitivity of the method was independent of salinity. This method had been used for the direct determination of aluminium in both tap and coastal sea-waters without any preconcentration steps.
authors.affiliation: Department of Chemistry, National University of Singapore, Lower Kent Ridge Road, Singapore 0511 Singapore.
authors.forename: C Y
authors.initials: CY
authors.lastname: Zhou
authors.forename: J
authors.initials: J
authors.lastname: Wu
authors.forename: H
authors.initials: H
authors.lastname: Chi
authors.forename: M K
authors.initials: MK
authors.lastname: Wong
authors.forename: L L
authors.initials: LL
authors.lastname: Koh
authors.forename: Y C
authors.initials: YC
authors.lastname: Wee