铁矿石是钢铁工业的基础原料,地质勘探和矿石的选冶都需了解其主要组分铁的含量。铁矿石中全铁的测定国内外标准分析方法,主要采用二氯化锡还原——重铬酸钾滴定法或硫化氢还原——重铬酸钾滴定法,但方法所用的二氯化汞和硫化氢对环境均有污染,故近来都在积极摸索无汞测铁的方法。其中有络合滴定法,NTA直接滴定,用水杨醛肟β—间羟苯基醛肟作指示剂、CYDTA直接滴定,用2——羟苯乙酮或2——羟苯内酮作指示剂用 Iron ore is the basic raw material for the steel industry. Both geological prospecting and ore dressing and smelting need to know the iron content of its main component. Determination of iron in iron ore The standard analytical methods at home and abroad, the main use of tin dichloride reduction - potassium dichromate titration or hydrogen sulfide reduction - potassium dichromate titration, but the method used mercuric chloride and sulfide Hydrogen pollution of the environment, it has recently been actively exploring mercury-free method of measuring iron. There are complexometric titration, NTA direct titration, salicylaldoxime β-hydroxyphenyl aldoxime as indicator, CYDTA direct titration, with 2-hydroxyacetophenone or 2-hydroxyphenidone as an indicator