Využitie dvoch extrakčných postupov v spojení s elektrotermickou atómovou absorpčnou spektrometriou pri špeciácii anorganického antimónu v prírodných vodách

Abstrakt

For speciation of inorganic Sb before its determination by electrothermal AAS, two extractions were used. Solid phase extraction (SPE) with nanosized TiO₂ as a sorbent was performed in separation/preconcentration of total inorganic Sb and subsequent direct sampling of TiO₂ slurry for sample injection into a graphite tube. The cloud point extraction (CPE) with ammonium pyrrolidinecarbodithioate as a chelating agent and hydrogen-octylphenoxy-poly(oxyethylene) (Triton X-114) as a nonionic surfactant were used in selective separation/preconcentration of Sb(III). Main attention was paid to interference of coexisting ions in the extractions and to that of Sb(V) excess in the CPE separation/preconcentration of Sb(III). The accuracy of the optimized methods was checked by a certified reference material for trace elements in lake water. The optimized methods were used for speciation of inorganic Sb in natural waters.