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本文以硫酸介质中过氧化氢氧化次甲基蓝褪色为指示反应,通过各种条件选择,建立了在邻菲罗啉存在下催化光度法测定痕量铁的新方法。该法测定范围为0.001—0.30μg/25mL铁(Ⅲ)。方法操作简单、选择性好,直接用于水体及分析纯盐酸中痕量铁(Ⅲ)的测定,获得了满意的结果。
In this paper, the decolorization of methine blue by hydrogen peroxide in sulfuric acid medium was taken as an indicator reaction. A new method for the determination of trace iron by catalytic spectrophotometry in the presence of o-phenanthroline was established by various conditions. The method of determination of the range of 0.001-0.30μg / 25mL iron (Ⅲ). The method has simple operation and good selectivity, and is directly applied to the determination of trace iron (Ⅲ) in water and analytical hydrochloric acid. The obtained results are satisfactory.