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目前,有机化合物中硫的测定广泛采用的还是氧瓶燃烧,以钍啉[苯-2-胂酸钠-(1-偶氮-1)-二-羟基萘-3.6-二磺酸钠]为指示剂,高氯酸钡滴定硫酸根的方法,然而磷、氟及许多金属元素有干扰.Bishara等曾用离子交换方法除去金属,用Th(NO_3)_4沉淀法消除磷酸根的干扰,Campbell用加入氯化钡,过滤生成的硫酸钡,然后溶于过量EDTA中,用氯化镁回滴的方法来测定硫,等采用硼酸作为掩蔽剂,并蒸发溶液来消除氟的干扰.但这些方法使用于常规分析很不方便。
At present, the determination of sulfur in organic compounds is widely used or oxygen bottle combustion, with thorium [sodium benzene-2-arseric- (1-azo-1) - di-hydroxynaphthalene-3.6- disulfonate] Indicator, barium perchlorate titration sulfate, phosphorus, fluorine and many other metal elements interference.Bishara et al have been used to remove metal ion exchange method, with Th (NO_3) _4 precipitation method to eliminate the interference of phosphate, Campbell used Barium chloride is added and the resulting barium sulfate is filtered and then dissolved in an excess of EDTA, sulfur is measured by drop-back with magnesium chloride, etc. Boric acid is used as a masking agent and the solution is evaporated to eliminate fluorine interference. However, these methods are used in conventional Analysis is very inconvenient.