Elektrothermische atomisierung von quecksilber bei anwesenheit von thiolhaltigen verbindungen

Electrothermal atomisation of mercury in the presence of thiols. Sample stabilisation during the drying step is important for the determination of mercury by electrothermal a.a.s. Addition of complexing agents with thiol groups makes possible the analysis of pure aqueous solutions. Mercury can be determined at concentrations down to 5 × 10^-6% with a reproducibility of 2–10%. Small amounts of acids and salts depress the efficiency of stabilisation, so that separation becomes necessary. The use of a selective ion-exchanger with thiol groups solves the problems of sample storage, separation and stabilisation. The enrichment enhances the sensitivity by two orders of magnitude. Determinations of 2–20 ppb Hg in water, 0.2–2 M HC1 and 0.2–1 M NaCl are reported.