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影响邻菲啰啉比色测定亚铁的主要因素是亚铁在显色、溶矿过程中易被氧化及高铁的严重干扰。本实验认为逐个显色、缩短显色过程是防止氧化的关键,而与温度关系不大。本方法采用NH_4F或HBF_4作溶剂,以SiO_2粉作排气保护,采取逐个显色防止亚铁氧化。高铁则选用氢醌作还原剂。经过生产考验适用于硅酸盐、铌钽矿和钨锡矿中亚铁和全铁的测定。 一、试剂 邻菲啰啉 0.13％水溶液(贮于暗色瓶中,不超过一周)。 醋酸缓冲溶液 100g醋酸铵溶于100ml水中。 显色剂 上述缓冲溶液与邻菲啰啉溶液按7∶3混合(现用现配)。 混合络合剂 含酒石酸铵24％,硼酸10％(用时配制)。
The main factor that affects the determination of ferrous phenanthroline by colorimetry is that ferrous iron is easily oxidized and seriously disturbed by high-speed rail in the process of color development and dissolution. The experiment that one by one color, shorten the color process is to prevent the oxidation of the key, but not with the temperature. This method uses NH_4F or HBF_4 as a solvent, SiO_2 powder exhaust protection, to take one by one color to prevent ferrous oxidation. High-speed rail is the choice of hydroquinone reductant. After the production test for silicate, niobium tantalum and tungsten tin ore ferrous and ferrous determination. First, the reagent o-phenanthroline 0.13% aqueous solution (stored in dark bottles, no more than a week). Acetic acid buffer solution 100g Ammonium acetate was dissolved in 100ml of water. Developer of the buffer solution and phenanthroline solution by 7: 3 mixed (now with the current). Mixed complexing agent containing ammonium tartrate 24%, boric acid 10% (formulated with time).