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本文研究了4－（2－吡啶偶氮）－间苯二酚（PAR）与铁（Ⅱ）的显色反应，本文选择了700nm为测定波长，该波长处的表观摩尔吸光系数为1．5×104mol·L-1·cm-1，铁量在0－100μg／25ml范围内服从比尔定律，本法简便、灵敏，用于矿石微量铁的测定结果良好。
In this paper, the color reaction of 4- (2-pyridylazo) -resorcinol (PAR) with iron (Ⅱ) was studied. The wavelength of 700 nm was chosen as the determination wavelength. The apparent molar absorptivity at this wavelength was 1. 5 × 104mol·L-1 · cm-1, the iron content in the range of 0-100μg / 25ml obey Bill’s Law, the method is simple and sensitive, the determination of trace iron for ore results.