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钨酸是我国一项重要出口创汇产品,可以用钨砂或废合金等含钨原料制备,产品出厂前需测定其中≤0.015%钠含量。离子选择电极法测定钠是可行的方法,但用于测定钨酸中钠尚未见报道。近年来,笔者用此法测定钨酸中的钠;监控分析了钨酸生产过程中所使用的水、试剂中的钠。分析结果与原子吸收光谱、火焰光度法吻合,而本方法仪器更为简单,尤其适合小企业使用。一仪器与试剂测量精度为±1mV的pHS-3型酸度计电磁搅拌器 6801型PNa电极及6802型甘汞电极(上海电光器件厂产) 钠标准溶液:精确称取灼烧过的NaCl(GR或AR)2.5638g,溶于去离子水或重蒸水中,移至1000ml量瓶
Tungstic acid is an important export-oriented foreign exchange product in China. It can be prepared from tungsten-containing raw materials such as tungsten sand or waste alloy. Before the product is delivered, the content of sodium ≤0.015% should be determined. Ion selective electrode method is a viable method for the determination of sodium, but the sodium tungstate has not been reported. In recent years, I used this method for the determination of sodium in tungstic acid; monitoring and analysis of the tungstic acid used in the production of water, reagents, sodium. The results of the analysis are consistent with atomic absorption spectrometry and flame photometry, and the method of the present invention is more simple, especially suitable for small business use. An instrument and reagent measuring accuracy of ± 1mV pHS-3-type acid meter Electromagnetic stirrer Model 6801 PNa electrode and 6802 calomel electrode (Shanghai electro-optic device plant production) Sodium standard solution: Accurately weigh the burning of NaCl (GR Or AR) 2.5638g, dissolved in deionized water or redistilled water, moved to 1000ml volumetric flask