Determination of Cl- in rare earth fluoride by acid leaching and silver chloride turbidimetry
The sample was immersed in nitric acid and hydrogen peroxide.Chloride ions and silver ions formed silver chloride colloidal particles in a dilute nitric acid medium.Ultraviolet-visible spectroscopy was used for turbidimetry measurement In the presence of stabilizer glycerol.And the chloride ion content was determined based on the work-ing curve.The optimal acid leaching conditions and turbidity conditions were determined in the study,base on result comparison experiments.The detection limit of the method was 0.0012％,and the detection lower limit was 0.0040％.The relative standard deviation of the experimental result was 3.25％and 1.78％,The method owned good precision and high stability.
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