Glass fluorinion content measuring method

Abstract

The invention provides a measuring method for fluorine ion content in glass. The measuring equipment adapting the measuring method comprises selecting electrode of fluorine ion, reference electrode, PH acidimeter and magnetic stirrer. Reagent comprises sodium hydroxide, phenolphthalein indicator, hydrochloride and regulating buffering solution of total ion intensity. The measuring method comprises following procedures that sample is washed and dried; sample of sodium hydroxide is melted; melted sample is immerged by hot de-ionized water; the regulating and buffering solution of total ion intensity is added; potential value is measured by the selecting electrode of fluorine ion; logarithm value of fluorine ion concentration is found on the calibration curve; fluorine ion concentration is calculated according to the formula of F-%=[(VXCX10) / (GX1000)]X100=(VXC) / G. Where: V--cubage of sample detecting solution (ml); G--sample weight (g); C-logarithm value of fluorine ion concentration found on the calibration curve. The invention is simple, quick and low cost compared with prior technology.

Description

technical field

[0001] The invention relates to a method for measuring fluoride ion content in glass. Background technique

[0002] For the determination of fluoride ion in glass, the national standard method adopts GB\T1549-94 Distillation-Spectrophotometry (Method I). The sample is melted with sodium hydroxide, distilled with perchloric acid, and fluorine is distilled to produce fluorosilicic acid; then use fluorine and zirconium in the orange-red complex of elechrome blue R-zirconium to form a more stable colorless complex ; Determination of fluorine by spectrophotometric method of fading reaction. This method has many steps and takes a long time to measure.

[0003] At present, the determination of fluoride ions in glass generally adopts the national standard method GB\T1549-94 precipitation-spectrophotometry (II method). The sample is melted with sodium hydroxide, the sulfate group is removed with barium chloride, and then silicon, iron, titanium, aluminum, calcium, ...