标准摘要
[中文适用范围]： 方法A适用于总铁含量为1％至25％(m/m)的产品，方法B适用于总铁含量为0.2％至2％(m/m)的产品。 ISO 7990 应与 ISO 4297 一起阅读。 规定了原理、反应（仅限方法 A）、试剂、仪器、取样和样品、程序和结果表达。 [外文原描述]： Method A is applicable to products having a total iron content from 1 to 25 % (m/m), and method B is applicable to products having a total iron content from 0.2 to 2 % (m/m). ISO 7990 should be read in conjunction with ISO 4297. Specifies principle, reactions (method A only), reagents, apparatus, sampling and samples, procedure and expression of results.
英文名称Manganese ores and concentrates — Determination of total iron content — Titrimetric method after reduction and sulfosalicylic acid spectrophotometric method