三氯化铝提取-EDTA容量法测定萤石中的氟化钙

Aluminium Chloride Extraction-EDTA Volumetric Method for Determination of Calcium Fluoride in Fluorite

将样品以稀乙酸处理与其它钙盐分离后,用中性三氯化铝溶液加热使氟化钙分解,在蔗糖溶液存在下,用氢氧化钾溶液调pH为12,加少许钙黄绿素-酚酞络合剂混合指示剂,再用EDTA滴定,测出氟化钙含量。

After the samples were treated with dilute acetic acid that separated from other calcium salt, calcium fluoride was decomposed with neutral chloride solution in the sucrose solution, then it was adjusted to pH 12 with potassium hydroxide solution, adding a few mixed calcein-phenolphthalein complex agent indicator, and calcium fluoride content was measured with the EDTA titration.