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炉渣中氟的测定有多种方法,但仍需用铂坩埚,我们经过试验,使用苛性碱于银坩埚中低温分解样品,以碳酸铵加硅酸钠分离干扰元素后直接测定氟的方法,操作快而准,且不需使用仪器和铂坩埚等。操作:称取试样0.5000～1.000g于银坩埚中,加苛性钠与苛性钾各1.5g混匀,于500～600℃马弗炉中进行熔融至均匀透明状,冷却后,用热水浸洗沉淀于烧杯中,加热煮沸,加10ml10%硅酸钠,用20%碳酸铵调至pH≈9,继续煮沸2～3分钟,冷却后将溶液连同沉淀一并移入250ml容量瓶中,混匀后稀释至刻度,待溶液澄清后进行干滤,吸取10ml
Determination of fluoride in the slag there are a variety of ways, but still need to use platinum crucible, we have tested, the use of caustic soda in the silver crucible in the decomposition of low temperature samples, with ammonium carbonate and sodium silicate separation of interference elements directly after the determination of fluorine, the operation Fast and accurate, and without the use of instruments and platinum crucibles. Operation: Weigh the sample 0.5000 ~ 1.000g in a silver crucible, add caustic soda and caustic 1.5g each 1.5g mixed in 500 ~ 600 ℃ muffle furnace to melt until uniform transparent, after cooling, with hot water immersion Wash precipitate in a beaker, heat boil, add 10ml10% sodium silicate, 20% ammonium carbonate was adjusted to pH ≈ 9, continue to boil for 2 to 3 minutes, after cooling the solution together with the precipitate into 250ml volumetric flask, mix After diluted to the mark, until the solution is clear after dry filtration, draw 10ml