title: In situ matrix evaporation by isothermal distillation of high-purity reagents for the determination of trace impurities by ion chromatography.
abstract: In situ matrix evaporation of high-purity acids based on isothermal distillation was achieved in a high-density polyethylene (HDPE) container on a water bath, to avoid contamination from the laboratory environment. The solubility of water and acid vapours in glycerol due to co-association was utilized to achieve complete evaporation. All major sources which contribute to the process blank were taken care of in a simple and effective way. A 50-fold preconcentration with >99.9% matrix removal was achieved for the analysis of low-boiling acids, HCl, HF, HNO3 and H2O2. The non-volatile ions NH4+, Li+, Na+, K+, Mg2+, Ca2+, SO4(2-) and PO4(3-) were determined by ion chromatograph with conductivity detection. The detection limits were 6-130 ng/l with recoveries of 85-110% for all ions studied.
authors.affiliation: National Centre for Compositional Characterisation of Materials (CCCM), Bhabha Atomic Research Centre, Hyderabad 500062, India.
authors.forename: S M
authors.initials: SM
authors.lastname: Dhavile
authors.forename: S
authors.initials: S
authors.lastname: Thangavel
authors.forename: K
authors.initials: K
authors.lastname: Chandrasekaran
authors.forename: K
authors.initials: K
authors.lastname: Dash
authors.forename: S V
authors.initials: SV
authors.lastname: Rao
authors.forename: S C
authors.initials: SC
authors.lastname: Chaurasia
mesh_terms: D002852:Chromatography, Ion Exchange; D007202:Indicators and Reagents / Q000737:chemistry*; D011095:Polyethylenes; D015203:Reproducibility of Results; D013816:Thermodynamics
chemical_list: D007202:Indicators and Reagents; D011095:Polyethylenes