本文件规定了测定铁矿石中总铁含量的两种无汞滴定法，在用氯化锡（II）和氯化钛（III）还原铁（III）后，使用重铬酸钾作为滴定剂。然后用稀重铬酸钾（方法1）或高氯酸（方法2）氧化多余的还原剂。 这两种方法都适用于天然铁矿石、铁精矿和烧结矿（包括烧结矿产品）中质量分数为30%至72%的铁的浓度范围。

This document specifies two titrimetric methods, free from mercury pollution, for the determination of total iron content in iron ores, using potassium dichromate as titrant after reduction of the iron(III) by tin(II) chloride and titanium(III) chloride. The excess reductant is then oxidized by either dilute potassium dichromate (Method 1) or perchloric acid (Method 2). Both methods are applicable to a concentration range of 30 % mass fraction to 72 % mass fraction of iron in natural iron ores, iron ore concentrates and agglomerates, including sinter products.