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现行湿法磷酸国家标准GB/T1 871 1 995中测定氟硅酸中P2 O5,由于含量少,规定采用比色法,操作繁琐耗时,且需精密仪器。本分析法采用在酸性介质中,正磷酸根与喹钼柠酮沉淀剂反应生成黄色磷钼酸喹啉沉淀,经过滤洗涤后,将沉淀溶解于氢氧化钠标准溶液中,然后用硝酸标准溶液滴定过量?
The current WPA national standard GB / T1 871 1 995 Determination of fluosilicate P2 O5, due to the low content, the provisions of the colorimetric method, cumbersome and time-consuming operation, and the need for precision instruments. The analysis method used in acidic medium, orthophosphate and quaternary ammonium molybdate precipitant reaction quinoline yellow phosphorus molybdate precipitation, after filtration and washing, the precipitate was dissolved in sodium hydroxide standard solution, and then with nitric acid standard solution Titration excessive?