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本容量法是基于氟能和锆生成稳定的无色络合物,过量地氯氧化锆和指示剂生成色淀。本法能测定像 SiF_6~(2-)、BF_4~-这样稳定离子中的氟。样品中含有较大量氯化物和硫酸盐时,对测定有干扰。严重污染的水须予先蒸馏后再进行测定。配制溶液须用新鲜蒸馏水,试剂用化学纯或分析纯的。每100ml试样中应含氟40—100μg,浓度较低时须用由0.01N 盐酸配成的0.001N 氯氧化锆滴定。氟含量太高时须将样品稀释。
This volumetric method is based on the formation of a stable, colorless complex with fluorine and zirconium, with an excess of zirconium oxychloride and indicator to generate a lake. This method can be measured like SiF_6 ~ (2 -), BF_4 ~ - so stable ions of fluorine. Sample contains large amounts of chloride and sulfate, the determination of interference. Severely contaminated water must be distilled before measurement. Preparation of the solution shall be fresh distilled water, reagent chemically pure or analytical pure. Each 100ml sample should contain 40-100μg of fluoride, at a lower concentration, 0.01N hydrochloric acid dubbed 0.001N zirconium oxychloride titration. The sample must be diluted when the fluorine content is too high.