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二甲酚橙-锆减色法测定氟已用于黄铁矿但此种间接方法都需经过蒸馏,萃取,离子交换等手续以分离干扰元素。因此不够快速.用碱金属碳酸盐熔样并用碳酸铵补充沉淀杂质或用碱金属氢氧化物熔样再用氨水补充沉淀杂质,在这两种情况下,必须除去过量的碳酸铵或氨水,因此耗时较长.Huang 用 NaKCO_3-ZnO 熔样以热水浸取,用铬菁R-锆退色法测定了硅酸盐中的氟。鉴于其明显的优点,我们曾试用于炉渣分析,实验表明,当样品中不含 SiO_2时铝的分离不完全,有干扰。因此,我们建议:(1)当样品中不含 SiO_2时,熔样时必须补加适量 SiO_2。(2)当样品中含有较多 SiO_2时,直接用NaKCO_3-ZnO 熔样。在这两种情况下均用热水浸取,以对硝基酚作指示剂调节浸取液至 pH6.5左右,使干扰离子沉淀完全,过滤后比色。一主要试剂锆标准溶液1.3×10~(-3)M,准确称取0.2095克ZrOCl_2·8H_2O 溶于少量浓盐酸,并用1N 盐酸稀释于500毫升量瓶中。
Determination of fluorine with xylenol orange - zirconium colorimetry has been used for pyrite, but such indirect methods are subject to distillation, extraction, ion exchange and other procedures to separate interfering elements. Therefore, not fast enough.Cover the precipitate with an alkali carbonate coupon and with ammonium carbonate, or with an alkali metal hydroxide melt and then with ammonia, in which case it is necessary to remove excess ammonium carbonate or ammonia, So take longer.Huang NaKCO_3-ZnO sample with hot water leaching, chromate R-zirconium colorimetric determination of fluoride in silicate. In view of its obvious advantages, we have tried the slag analysis, experiments show that when the sample does not contain SiO2, the separation of aluminum is not complete, there is interference. Therefore, we propose: (1) When the sample does not contain SiO_2, the sample must be supplemented with an appropriate amount of SiO_2. (2) When the sample contains more SiO 2, NaKCO 3-ZnO is directly used as the sample. In both cases leaching with hot water, nitrophenol as an indicator to adjust the leachate to about pH6.5, the interference ion precipitation is complete, colorimetric after filtration. A main reagent of zirconium standard solution 1.3 × 10 ~ (-3) M, accurately weighed 0.2095 g ZrOCl_2 · 8H_2O dissolved in a small amount of concentrated hydrochloric acid, and diluted with 1N hydrochloric acid in 500 ml volumetric flask.