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研究了酒石酸-Fe~(3+)、草酸-Fe~(3+)及柠檬酸-Fe~(3+)体系的光化反应,并用于偶氮胂Ⅱ光度法测定钍时消除铁的干扰。这三个体系都需要在较低浓度的盐酸(1N以下)介质中进行反应,酸度大则Fe~(3+)退色缓慢。经光照射,在25毫升体积内,对10毫克Fe~(3+),有1～20毫升10%酒石酸存在5～10分钟退色;有1～20毫升10%草酸存在10～30分钟退色:而有1～10毫升10%柠檬酸存在1～2小时以后才退色。随着三种酸量的增加退色加速。酒石酸和草酸的10%溶液各1毫升,经光照射后,可消除20毫克Fe~(3+)的干扰。除日
The photochemical reaction of tartaric acid-Fe 3+, oxalic acid-Fe 3+ and citric acid-Fe 3+ system was studied and its application to the arsenazoⅡ spectrophotometric determination of thorium . All three systems need to react at a lower concentration of hydrochloric acid (below 1N) medium, and the acidity is high, while Fe ~ (3 +) fade slowly. After light irradiation, 10 ml of tartaric acid is deprived of 1 to 20 ml of 10% tartaric acid in 10 ml of Fe 3+ in a volume of 25 ml; 1 to 20 ml of 10% oxalic acid is present for 10 to 30 minutes. Fading: And 1 to 10 ml of 10% citric acid after 1 to 2 hours before fading. With the increase of three acids fade accelerated. Tartaric acid and oxalic acid 10% solution of 1 ml each, after light irradiation, can eliminate the interference of 20 mg Fe ~ (3 +). Except day