Quantification of Fluoride from Radioactive Liquid Wastes by Pyrohydrolysis Separation and Ion Chromatography

摘要

It is demonstrated, that the fluoride can be separated from LIQUID WASTES using pyrohydrolysis method. The routine method for separation of halides from ceramic samples was modified for radioactive liquid wastes. Subsequently, after separation by pyrohydrolysis, fluoride was determined from the pyrohydrolysis distillates by ion chromatography. Total time taken to determine fluoride is about 45 min including 30 min for the pyrohydrolysis and 15 min for ion chromatography. The results of recovery tests ranged 98% or above. The limit of detection for fluoride is 0.5 mgkg~(-1).