摘要
用过量的含有Ｈ２ＳＯ４的（ＮＨ４）２Ｆｅ（ＳＯ４）２溶液分解多金属结核的同时，还原了试样中的ＭｎＯ２，然后以Ｋ２Ｃｒ２Ｏ７标准溶液滴定测定了多金属结核中的ＭｎＯ２。就样品分解过程中的加热温度和时间对测定结果的影响及标准溶液的标定等问题进行了讨论，经多次测定，方法重现性好。应用此方法为新研制的多金属结核标准物质提供了ＭｎＯ２的定值数据，其结果与初定值相符，无剔除值，精密度（ＲＳＤ，ｎ＝８）小于０６％。
An excess of (NH 4) 2Fe(SO 4) 2 containing H 2SO 4 is used to decompose oceanic polymetallic nodules and reduce MnO 2 in the samples. MnO 2 is determined by titrimetry with K 2Cr 2O 7. The effect of heating temperature and the time required in sample preparation on analytical results and the standardization of standards solution are discussed. The method has been applied to the determination of MnO 2 in national standard reference polymetallic nodules. The results are in good agreement with certified values with precision of less than 0.6% RSD( n =8).
出处
《岩矿测试》
CAS
CSCD
北大核心
1997年第3期177-179,共3页
Rock and Mineral Analysis
关键词
二氧化锰
多金属结核
容量法
标准物质
manganese dioxide, polymetallic nodules, volumetry, reference material
