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文献报导了用氟电极测定硅的方法,我们试把氟电极法用于硅铁中硅的测定,获得了满意的结果硅铁试样先经碱熔,随后用热水及HCl浸取,定容以后,吸取等分部份,在微酸性介质中,用过量KF(或NaF+KCl)溶液沉淀硅酸为K_2SiF_6,然后用氟电极法测定溶液中NaF的余量。在掩蔽剂存在下,可以排除共存的Fe~(3+)、Al~(3+)、Mn~(2+)、Ni~(2+)等离子的干扰。试验部份一仪器及试剂 pHS-2型酸度计,CSB-F-1型氟离子选择电极及232型饱和甘汞电极。硅标准溶液:称取烘干研细的优级纯SiO_21.0696g于铂坩埚中,加入K_2CO_3和Na_2CO_3(1:1)6g,在
Reported the use of fluorine electrode method for the determination of silicon, we try the fluorine electrode method for the determination of silicon in ferrosilicon obtained satisfactory results ferrosilicon sample first by alkali melting, followed by hot water and HCl leaching, set After soaking, draw an aliquot, in a slightly acidic medium, with excess KF (or NaF + KCl) solution precipitated silicic acid K_2SiF_6, and then the fluoride electrode method to determine the balance of NaF solution. In the presence of masking agent, interferences of coexisting Fe 3+, Al 3+, Mn 2+, and Ni 2+ can be excluded. Experimental part of an instrument and reagent pHS-2 pH meter, CSB-F-1 fluoride ion selective electrode and 232 saturated calomel electrode. Silicon standard solution: Weigh dry finely ground grade pure SiO_21.0696g in a platinum crucible, add K_2CO_3 and Na_2CO_3 (1: 1) 6g, in the