近年来为了微量铁的比色分析法,曾提供多种有机试剂如α-α’变吡啶基(α-α’-дипиридил,α-α’-dipyridyl)、硫代羟基乙酸(тноглнколеваякислота,Thioglycollic acid)、亚硝基R盐(нитроао-R-соль)等。由於这些试剂很少推广,在工厂实用上,仍多半采用硫氰化铵法。虽然硫氰试剂是最灵敏的且早就熟悉的一种试剂,但它仍不能完全采用为铁的比色分析法。正如巴伯可氏所指出的,复离子FeCN~(2+)显 In recent years, a variety of organic reagents such as α-α’-дипиридил (α-α’-dipyridyl), thioglycolic acid (тноглнколеваякислота, Thioglycollic acid ), Nitrosyl R salts (нитроао-R-соль) and the like. Due to the fact that these agents are rarely marketed, the ammonium thiocyanate method is still mostly used in factories. Although thiocyanide is the most sensitive and long-familiar reagent, it still can not fully use colorimetric analysis for iron. As Barcock points out, complex ion FeCN ~ (2+) was significant