本文对铁（Ⅱ）－三吡啶三嗪配合物在散射光下的光还原反应进行了研究。发现在铁（Ⅱ）、铁（Ⅲ）共存时加入氟化铵可阻止上述反应，此法用于测定铁矿中铁的价态比，结果满意。 In this paper, the photoreduction reaction of iron (Ⅱ) -pyridinium triazine complex under scattered light was studied. It was found that adding ammonium fluoride to iron (Ⅱ) and iron (Ⅲ) co-existed to prevent the above reaction. This method was used to determine the valence ratio of iron in iron ore with satisfactory results.