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基于ｐＨ４．０ 的弱酸性介质中Ｆｅ（Ⅲ）对过氧化氢氧化日落黄褪色反应的催化作用，提出一种催化褪色光度法测定痕量铁的新方法，研究了该方法的适宜反应条件，方法的检出限为９．１×１０－ ７ｇ／ＬＦｅ（Ⅲ），线性范围为０～１．２５μｇ／２５ｍ ｌＦｅ（Ⅲ），方法用于人发及粮食中痕量铁的测定，结果满意．
Based on the catalytic effect of Fe (Ⅲ) on the fading reaction of sunset yellow by hydrogen peroxide in a weakly acidic medium of pH4.0, a new method for the determination of trace iron by catalytic fading spectrophotometry was proposed. The suitable reaction conditions, The detection limit of this method was 9.1 × 10-7 g / L Fe (Ⅲ) with a linear range of 0 ~ 1.25μg / 25μm Fe (Ⅲ). The method was applied to the determination of trace amounts of iron in human hair and foodstuffs. .