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鉀的測定方法很多,在常量分析中最通用的是亚硝酸鈷鈉容量法。为了使沉淀完全,常加入过量的亚硝酸鈷鈉沉淀剂,但在过滤后成为廢液。亚硝酸鈷鈉价格昂貴,有必要进行回收。一、回收方法收集鉀沉淀过滤后的滤液及用2.5%硫酸鈉液洗滌两次的滤液(将以后的洗液弃去)合併,加20%的氫氧化鈉液,則钴呈藍綠色的碱式盐凝胶状沉淀。也可加20%的碳酸鈉液,此时鈷被沉淀为玫瑰色的碱式碳酸盐凝胶。待上部清液无色时,表明鈷已沉淀完全。用吸滤瓶及大的平底瓷漏斗,与水喞筒連接,于漏斗中鋪
Potassium determination of many ways, the most common in the constant analysis is sodium cobaltous oxide volumetric method. In order to complete the precipitation, often adding an excess of sodium cobaltous oxide precipitant, but after filtration into a waste. Sodium cobalt nitrite is expensive and necessary for recovery. First, the recovery method Collection of potassium precipitation filtered filtrate and the filtrate was washed with 2.5% sodium sulfate solution twice (to discard the wash after the merger), plus 20% sodium hydroxide solution, the cobalt was blue-green base Salt gel-like precipitate. You can also add 20% of the sodium carbonate solution, cobalt was precipitated as rosy alkaline carbonate gel. When the supernatant colorless, indicating that the cobalt has been completely precipitated. Use suction flask and large flat porcelain funnel, connected with the water tube, in the funnel shop