根据甲基橙光动力学法对环境样品中微量铁的分析,我们想到了具有类似结构骨架而取代基不同的甲基红也可能有类似的效果,从而对其分析应用进行了考查。结果表明,本法比甲基橙光动力学法灵敏,选择性较好,并有较宽的可利用的pH范围,因此是一种较好的光动力学分析法。本法在0—0.7μg/ml Fe(Ⅲ)范围内符合比耳定律,检测限为0.05μg/ml Fe(Ⅲ)。 According to the methyl orange photodynamic analysis of trace amounts of iron in environmental samples, we have come to the conclusion that its analytical application may have similar effects with methyl red with similar structural framework and different substituents. The results show that this method is more sensitive and selective than methyl-methyl photodynamic method, and has a wide available pH range. Therefore, it is a good method for photodynamic analysis. This method conforms to Beer’s law in the range of 0-0.7 μg / ml Fe (Ⅲ) with a detection limit of 0.05 μg / ml Fe (Ⅲ).