Discussion on alkali fusion-spectrophotometric determination of fluorine in niobium-enriched slag
LIU Chun1, 2, WANG Dan1, 2, CHANG Cheng1, 2
1. Rui Ke National Engineering Research Centre of Rare Earth Metallurgy and Function Materials Co., Ltd., Baotou 014030, China; 2. Baotou Research Institute of Rare Earths, Baotou 014030, China
Abstract：Sample was fused by sodium hydroxide-sodium peroxide at 750 ℃ and then leached and filtrated with de-ionized water to enrich fluorine in the filtrate. During the process of color developing, 5 mL of acetone was used as stablilizer and 5 mL of alizarin complexon dehydrate was used as developer. The sample was kept in water bath at 40-45 ℃ for 50 min, then the solution absorbance was determined with spectrophotometry, and the amount of fluorine was acquired with the calibration curve. It was showed through interference test that potential anions like phosphate radicals and silicate radicals had no interference with the determination. The method was applied to determine fluorine in niobium-enriched slag. The relative standard deviation (RSD) was 1.6% (n=10). The standard addition recovery was 99.9%-104.0%.
刘春, 王丹, 常诚. 碱熔融-分光光度法测定富铌渣中氟的探讨[J]. 冶金分析, 2014, 34(4): 47-50.
LIU Chun, WANG Dan, CHANG Cheng. Discussion on alkali fusion-spectrophotometric determination of fluorine in niobium-enriched slag. , 2014, 34(4): 47-50.
