title: Ultrasound-assisted analyte extraction for the determination of sulfate and elemental sulfur in zinc sulfide by different liquid chromatography techniques.
abstract: The speciation and determination of sulfate (SO4(2-)) and elemental sulfur (S degree) in zinc sulfide (ZnS) using ion-chromatography (IC) and reversed-phase liquid chromatography (RPLC) respectively is described. Three sample pretreatment approaches were employed with the aim of determining sulfate: (i) conventional water extraction of the analyte; (ii) solid-liquid aqueous extraction with an ultrasonic probe; and (iii) elimination of the zinc sulfide matrix via ion-exchange dissolution (IED). The separation of sulfate was carried out by an anion-exchange column (IonPac AS17), followed by suppressed conductivity detection. Elemental sulfur was extracted ultrasonically from the acid treated sample solution into chloroform and separated on a reversed phase HPLC column equipped with a diode array detector (DAD) at 264 nm. The achievable solid detection limits for sulfate and sulfur were 35 and 10 microg g(-1) respectively.
authors.affiliation: National Centre for Compositional Characterisation of Materials (CCCM), Bhabha Atomic Research Centre, ECIL (PO), Hyderabad, Andhrapradesh 500062, India.
authors.forename: K
authors.initials: K
authors.lastname: Dash
authors.forename: S
authors.initials: S
authors.lastname: Thangavel
authors.forename: N V
authors.initials: NV
authors.lastname: Krishnamurthy
authors.forename: S V
authors.initials: SV
authors.lastname: Rao
authors.forename: D
authors.initials: D
authors.lastname: Karunasagar
authors.forename: J
authors.initials: J
authors.lastname: Arunachalam