Abstract
Freshwater sediments, non-polluted with respect to thallium, have been submitted to two independent sequential leaching procedures. Small concentrations require graphite furnace AAS measurements. The sensitivity of graphite furnace AAS is significantly lowered by matrix effects from both the reagent solutions, and also dissolved Ca, Mg, Fe and P. Separation and enrichment from acetate buffer, dithionite buffer, as well as from NaOH and HNO3 after neutralization, can be achieved by coprecipitation with MnO2. Hydroxylamine in acetic acid as well as oxalate has to be destroyed by oxidation with H2O2, catalyzed by Pd. From NH4Cl and HCl, Tl is not coprecipitated with MnO2. It can be however, separated, by liquid-liquid extraction from 1M HCl into butyl acetate.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
