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石膏中硫酸根的测定,目前多采用操作繁琐的硫酸钡重量法。文献推荐在醋酸铵缓冲液中,用标准K_2CrO_4溶液直接滴定钡,以CrO_4~(2-)在交流示波图上出现切口指示终点,实现钡的快速测定。我们发现,如采用醋酸盐底液,当有其他盐类存在时,终点迟钝,滴定无法进行。本文提出加标准钡溶液沉淀硫酸根,在pH7.8的乙二胺-盐酸缓冲液中,用标准K_2CrO_4滴
Determination of sulfate in gypsum, the current use of tedious barium sulfate weight method. Literature recommended in ammonium acetate buffer, the standard K_2CrO_4 solution titration barium, CrO_4 ~ (2) in the AC oscillogram incision indication endpoint, the rapid determination of barium. We found that if the acetate bottom solution, when there are other salts exist, the end point is sluggish, titration can not be carried out. This paper proposed a standard barium sulfate precipitated solution, in pH7.8 ethylenediamine - hydrochloric acid buffer, with standard K_2CrO_4 drops