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本文在资料(冶金部钢铁研究院化学室,钢铁冶金物料分析,上册,290及126页,1978年)介绍的方法基础上,对试样的溶解,测定液酸度的调整以及络合缓冲液的用量等方面进行了进一步试验。试验表明:保护渣试样在3N盐酸介质中煮沸溶解,氟不会逸损,和有关文献介绍一致。同碱熔样对比证明,采用酸溶样即使试样溶解不完全,但配入保护渣中的氟化物都可以被盐酸完全溶解;用茜素磺酸钠作指示剂代替酸度计调整测定液酸度(pH=9)是可行的;测定液中氢氧化铁等沉淀的存在不影响氟的
Based on the methods described in the Materials (Chemistry Room, Institute of Iron and Steel Metallurgy, Metallurgical Materials Research, Volumes 290 and 126, 1978), the dissolution of the sample, the adjustment of the acidity of the test solution, Dosage and other aspects of the further tests. Experiments show that: the sample powder in 3N hydrochloric acid boiling in the medium dissolved, fluorine will not escape loss, and the literature introduced the same. Comparison with the alkali melting sample proved that the use of acid sample even if the sample is not completely dissolved, but with fluoride fluoride compound can be completely dissolved in hydrochloric acid; sodium alizarin sulfonate indicator instead of acidometer to adjust the determination of acidity (pH = 9) is feasible; the presence of precipitates such as iron hydroxide in the assay does not affect the fluorine