Determination of Fluoride Ions in Iron Ores by UV--VIS Spectrophotometry after Matrix Removal Using Diphonix-Resin

摘要

A modification of the spectrophotometric method for the determination of fluoride ions in iron-rich materials is proposed. In this method the iron matrix was successfully removed using Diphonix-resin. The studied sample was a ferruginous mineral which contained about 38% of iron. The Euronorm certified reference material (ECRM) 676-1 (Iron Ore Sinter), as a commercially available material having a similar matrix (39.76% w / w Fe) and fluoride level (0.1% w / w), was used to validate the method. After partial digestion in concentrated hydrochloric acid the samples were diluted and passed through Diphonix- resin. The concentration of fluoride ions was determined by a spectrophotometric method using a Zr:ER complex (λ = 540 nm). The result obtained for the ECRM was in good agreement with the certificate specification and thus proved the method to be applicable for the determination of fluoride ions in iron-rich materials. Due to the easy digestion step and simple requirements for equipment, this method can be used in most laboratories.