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实验发现,在散射光中Fe(Ⅱ)-phen配合物能发生显著的光还原反应,当向体系中加入EDTA后则可阻止Fe(phen)_3~(2+)的生成,用汞灯液内照射Fe~(3+)-phen及Fe~(3+)-phen-EDTA体系,6分钟内能将100μgFe~(3+)还原成Fe(phen)_3~(2+)。这种光化学还原法已用于水及合成氨触媒的铁价态分析。触媒分析结果与推荐值一致。
It was found that Fe (Ⅱ) -phen complex could undergo a significant photoreduction reaction in the scattered light, which could prevent the formation of Fe (phen) _3 ~ (2+) when EDTA was added into the system. The Fe ~ (3 +) - phen and Fe ~ (3 +) - phen-EDTA systems were able to reduce 100 μg Fe ~ (3+) to Fe (phen) _3 ~ (2+) within 6 minutes. This photochemical reduction method has been used for the analysis of iron valence states of water and ammonia catalysts. The result of catalyst analysis is consistent with the recommended value.