三氯化铝提取-EDTA容量法测定萤石中的氟化钙  

Aluminum Trichloride Extraction-EDTA Volumetric Method for Determination of Calcium Fluoride in Fluorite

作　　者：陈慰娟 张世炜 Chen Weijuan;Zhan Shiwei(Laboratory of the 7th Geological Group,Guangdong Geological Bureau,Huizhou 516000,China)

机构地区：[1]广东省地质局第七地质大队,广东惠州516000

出　　处：《广东化工》2024年第20期181-183,共3页Guangdong Chemical Industry

摘　　要：氟化钙在稀乙酸中溶解度较小,样品依次通过稀乙酸、中性三氯化铝溶液提取处理后,在蔗糖、pH=12的介质中,用EDTA溶液滴定[1-2]。本文通过选择控制稀乙酸用量、洗涤沉淀用水量、氢氧化钾用量试验和精密度、加标回收率试验,得出该方法精密度高、准确性高、所需仪器设备简单,实用性强的结论。The solubility of calcium fluoride in dilute acetic acid is small.The samples were extracted and treated with dilute acetic acid and neutral aluminum trichloride solution successively,and titrated with EDTA solution in sucrose and PH=12 medium.By selecting and controlling the amount of dilute acetic acid,the amount of water used for washing and precipitation,the amount of potassium hydroxide and the precision and recovery of standard addition,the paper draws the conclusion that the method has high precision,high accuracy,simple equipment and strong practicability.

关 键 词：氟化钙 萤石 选择控制 EDTA滴定法 

分 类 号：TQ[化学工程]