Separation of Manganese in the Analysis of Limestone and Similar Materials.
Separation of Manganese in the Analysis of Limestone and Similar Materials.
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DOI：
10.1021/ie50187a042
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发表时间：
1925-07
影响因子：
--
通讯作者：
A. Epperson
中科院分区：
文献类型：
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作者：
A. Epperson
“岩石”，Hillebrand3引用了氨和过硫酸铵的使用，目的是将锰与铁和铝一起沉淀，并指出钙作为硫酸盐部分沉淀的可能性尚未进行研究。因此，下面的试验是为了简化石灰和镁的测定，如果锰不溶解在溶液中，这两种测定都会出错。在分析波特兰水泥和某些类型的石灰石时，尤其需要消除锰，因为大多数误差落在镁上，而镁通常是许多含石灰材料是否被接受的决定性因素之一。氧化铝的良好沉淀需要仔细调整溶液的pH值，这可以通过使用甲基红或玫瑰果酸来实现。在初步试验中发现过硫酸盐能迅速破坏甲基红，但不能破坏红果酸。因此，采用玫瑰果酸作为指示剂，并采用以下改进的Blum方法对标准局的1号泥质石灰石、水合石灰样品和波特兰水泥样品进行了分析，其中在某些情况下添加了测量量的MnO：
Rocks,” Hillebrand3 cites the use of ammonia and ammo-nium persulfate for the purpose ofprecipitating manga-nese together with iron and aluminium, and states that the possibility of partial precipitation of calcium as sulfate has not been investigated. The following tests were therefore made with the idea of simplifying the subsequent deter-minations of lime andmagnesia, both of which would be in error if manganese were left insolution. The elimination of manganese is especially desirable in the analysis of Portland cement and certain types of limestones, for most of the error falls on magnesia which is often one of the deciding factors in the acceptance of many lime-bearing materials. A good precipitation of alumina demands careful adjustment of the pH of the solution, and this Blum4 accomplished by the use of either methyl red or rosolic acid. In preliminary tests it was found that persulfate destroys methyl red quickly, but not rosolic acid. Rosolic acid was therefore adopted as indicator, and thefollowing modified Blum method was used in theanalysis of the Bureau of Standards Argillaceous Limestone No. 1, a sample of hydrated lime, and one of Portland cement, to which had been added measuredamounts of MnO in certain cases: