我们根据所著“純化学試制”一书中所載的法因别尔格方法,从分析試驗室中所收集的碘化亚銅沉淀(用碘量法測定銅时的殘液)回收碘化鈉获得成功,現特介紹,以供参考。将每次滴定后的殘液及沉淀收集于較大容器內,于溶液中加入硫酸銅飽和溶液,此时游离碘与溶液中显出藍色。再加入硫代硫酸鈉使藍色消失,并析出大量碘化亚铜沉淀。如此反复进行处理,直至溶液中的碘化物完全轉变为碘化亚銅沉淀为止(即加入硫酸銅溶液后稍有藍色卽可)。靜置使沉淀下降,用傾泻法过滤,以水洗滌,至沉淀 We recover sodium iodide from the cuprous iodide precipitate collected from the analytical laboratory (the raffinate when copper is determined by iodometry) according to the Fibrellian method contained in the book, Purification Preparation. To be successful, are introduced, for reference. The raffinate and precipitate after each titration were collected in a larger container, and a saturated solution of copper sulfate was added to the solution, in which case the free iodine appeared blue in the solution. Then add sodium thiosulfate to disappear the blue, and precipitate a lot of precipitation of cuprous iodide. This process is repeated until the iodide solution is completely converted to copper iodide precipitation (that is, after the addition of copper sulfate solution slightly blue 卽 can be). Allow the sediment to settle down, filter it by pouring, wash with water until it settles