锰矿石中有效氧(通常均以MnO_2表示)的测定,前人虽进行过广泛研究,但至今似仍未找到一个简便快速与准确可靠兼有的方法。其中如应用最广的草酸盐法,不仅测定周期较长,而且由于在溶样过程中常引起草酸分解,故不易获可靠结果。文献推荐的亚铁盐法,虽优于前者,但因其均采用加热溶样的程序,必须在惰性气体保护下操作,测定条件要求较严,故未能普遍推广使用。同时,常与锰矿石相伴生的磁铁矿等,也有严重干扰。本文研究了亚铁盐-硫酸溶液在室温 The determination of available oxygen in manganese ores (usually expressed as MnO 2) has been extensively studied by our predecessors. Up to now, no method has been found to be simple, rapid, accurate, and reliable. Among them, the most widely used oxalate method not only has a long measurement period, but also is not easy to obtain reliable results due to oxalic acid decomposition often caused by the sample dissolution process. Although the ferrous salt method recommended in the literature is superior to the former one, it must be operated under the protection of inert gas due to the procedure of heating the sample solution. The determination of the conditions requires more stringent conditions, so it has not been widely used. At the same time, often associated with manganese ore magnetite, also have serious interference. This article studies the ferrous salt-sulfuric acid solution at room temperature