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用碘量法测定矿品中的锡,有许多问题研究。碘的溶解度很小,故配制碘液时,须用碘化钾作溶剂。通常采用两倍于碘重量的碘化钾,但碘液在存放或用于滴定时,仍有挥发现象。必须有大量的碘化钾存在于碘液中,达到4%浓度,才使碘与碘化钾结合成为稳定的I_3~-,以消除挥发的误差。碘液中有溶解氧,干扰测定锡。此问题应引起重视,我曾用碳酸气排除碘液中的溶解氧,希望得到完全无氧碘液。经过多次实验,用等当量的标准锡和标
Determination of tin in mineral products by iodometry, there are many issues. Iodine solubility is very small, so the preparation of iodine, potassium iodide to be used as a solvent. Potassium iodide, twice the weight of iodine, is commonly used, but iodine remains volatile when stored or used for titration. There must be a large number of potassium iodide present in the iodine solution, to 4% concentration, only iodine and potassium iodide combined into a stable I_3 ~ - to eliminate the volatility error. Dissolved oxygen in iodine solution, interference determination of tin. This issue should be taken seriously, I have used carbon dioxide to remove dissolved oxygen in iodine, hoping to get completely oxygen-free iodine. After many experiments, with an equivalent amount of standard tin and standard