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本文在进行条件实验的基础上,拟订了用艾氏剂半熔分解煤样,采用氟离子选择电极测定煤中氟的含量方法;经实验证明,此法比手续繁琐的蒸馏法等具有较灵敏、选择性较好、成本低、易操作等优点。测定步骤 1 标准曲线的绘制:于50毫升量瓶中准确加入0、10、30、50、70、90、100微克标准氟溶液(所加溶液控制在5毫升之内),加入艾氏剂空白液25毫升,溴甲酚绿1滴,用(1+1)硝酸中和试液呈黄色,充分摇动除去二氧化碳,然后用20%氢氧化钠小心调节溶液刚呈现蓝色;然后加入1M柠檬酸三钠-0.2M硝酸钾络合缓冲液10毫升,用去离子水稀至刻度,摇匀放置20分钟,倾入50毫升塑料杯中,插入氟电极和饱和甘汞电极,电磁搅拌下,待指针不动时,读其平衡电位值。以测得的电
In this paper, based on the experimental conditions, the preparation of aldrin semi-melt decomposition of coal samples, fluoride ion selective electrode determination of fluorine content in coal; the experiment proved that this method than the tedious distillation method has more sensitive , Better selectivity, low cost, easy operation and so on. Determination of the standard curve of step 1: 0, 10, 30, 50, 70, 90, 100 micrograms of standard fluorine solution (the added solution is controlled within 5 ml) in a 50 ml volumetric flask, add aldrin blank Liquid 25 ml bromocresol green 1 drop, with (1 + 1) nitric acid and the test solution was yellow, shake to remove carbon dioxide, and then carefully adjusted with 20% sodium hydroxide solution was blue; then add 1M citric acid Trisodium 0.2 M potassium nitrate complex buffer 10 ml, dilute to the mark with deionized water, shake for 20 minutes, poured into 50 ml plastic cup, insert the fluorine electrode and saturated calomel electrode, under electromagnetic stirring until When the pointer is not moving, read the balance potential value. To measure the electricity