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石油化工应用催化剂中,常需分析氧化铝中低至万分之几的氟,过去采用蒸馏法分离,因铝与氟强烈络合,氟往往蒸馏不完全,数据不稳。遵照科研为生产服务的方针,我们试用氟离子电极解决这一课题。问题的关键是采用一种掩蔽剂,夺取铝氟络合物中的铝,使氟释放出来。文献中报道过多种铝的掩蔽剂,但柠檬酸钠或柠檬酸钠加上 CYDTA 只能掩蔽小于5毫克的铝;磺基水杨酸能掩蔽25毫克的铝,但需在 pH 9才能掩蔽,由于受 pH 的影响,氟的浓度必须大于1×10~(-4)M,铝氟比例还在500倍左右。Wilson 用氟离子电极测定氧化铝中氟,但氟量为百
Petrochemical application of catalyst, often need to analyze the low alumina as few parts of the fluorine, the past separation by distillation, due to the strong complexation of aluminum and fluorine, fluorine is often incomplete distillation, data instability. In accordance with the principle of scientific research for production services, we try fluoride ion electrode to solve this problem. The crux of the problem is the use of a masking agent to sequester the aluminum in the aluminum-fluoro complex and release the fluorine. A variety of aluminum masking agents have been reported in the literature, but sodium citrate or sodium citrate plus CYDTA can mask only less than 5 milligrams of aluminum; sulfosalicylic acid masks 25 milligrams of aluminum but masks at pH 9 , Due to the influence of pH, the concentration of fluorine must be greater than 1 × 10 -4 M, the aluminum-fluorine ratio is still about 500 times. Fluoride ion electrode was used to measure fluorine in alumina, but the amount of fluoride was 100