Abstract
A hydropyrolytic-ion chromatographic method was developed for the analysis of fluoride in coal, ash, and geological materials. The hydropyrolytic extraction employs humidified air and MoO/sub 3/ to promote the evolution of fluoride in a 1050/sup 0/C tube furnace. The fluoride is captured in a weak solution of NaHCO/sub 3/ and determined by ion chromatography (IC). The IC determination utilizes a column switching technique to resolve F/sup -/ from the void volume and Cl/sup -/ interferences. Short-term precision of the hydropyrolytic-IC determination is approximately 5%. The F/sup -/ determination is linear from the detection limit of 1-500 ng. Results obtained for a coal and rock standard differ from the certified values by 6.8% and 0.5%, respectively. The fluoride concentrations of 15 geological standard reference materials are compared to reported results and to results measured by an ion selective electrode method.
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
