论文部分内容阅读
本文采用苛性碱分解试料,加硅酸钠使铝成硅铝酸钠沉淀而与氟化钾、钠分离。为使除铝更完全,控制溶液在pH9左右,加入适量的碳酸铵中和过量的苛性碱,成为碳酸盐碱性溶液,调至溶液在pH4时,在醋酸介质中借醋酸铅及氯化钠沉淀氟为氟氯化铅,然后在六次甲基四胺的溶液中(pH=5.5～5.8)时,用标准EDTA溶液滴定滤液中的过量铅离子(以二甲酚橙作指示剂)。此法分析速度快,比以往所采用的重
In this paper, caustic alkali decomposition sample, add sodium silicate to make aluminum into sodium aluminosilicate precipitation and potassium fluoride, sodium separation. In order to make the aluminum removal more complete, control the solution at about pH9, add an appropriate amount of ammonium carbonate and neutralize excess caustic to become carbonate alkaline solution, adjust the solution at pH4, in acetic acid medium by lead acetate and sodium chloride The fluoride is precipitated as PbF4, and then excess lead (with xylenol orange as an indicator) is titrated with a standard EDTA solution in a solution of hexamethylenetetramine (pH = 5.5-5.8). This method of analysis is faster than ever before