有关金属铬、金属钒中微量铁的分析,已有很多文献报道,大多以硫氰酸盐进行显色。为了更好地开展工作,适应目前生产的需要,为此我们进行了邻一菲罗啉测定铁的试验工作,得到了比较满意的结果。分析方法样品以酸溶解,硫脲作还原剂 Fe~(3+)→Fe~(2+),于pH3～5之间以邻—菲罗啉进行显色。Fe~(2+)与菲罗啉 There is a lot of literature on the analysis of trace amounts of iron in metallic chromium and metallic vanadium. Most of them are developed with thiocyanate. In order to carry out the work better and adapt to the needs of the current production, we carried out the experimental work of determination of iron by phenanthroline, and obtained satisfactory results. Analytical Methods The samples were acid-solubilized and thiourea was used as the reducing agent Fe 3+ → Fe 2 +, and the coloration was carried out with o-phenanthroline at pH 3-5. Fe 2+ and phenanthroline