论文部分内容阅读
铝酸钠溶液中镓的分析方法,基于以氟化铵掩蔽铝,加过最的EDTA标准液,使之与镓完全络合,过量的EDTA以PAN为指示剂,用硫酸铜标准液回滴,求得镓量。但此法在使用中存在着滴定终点易褪色、终点难于辨认的缺点,为解决终点褪色快的问题,我们试用硼酸掩蔽过量的氟离子,并对硼酸的加入量进行了试验,确定了最佳用量。 分析步骤:取适量样品溶液(视含镓量而定)于盛有10ml EDTA标准液(T_(Ga)=
Analysis of gallium in sodium aluminate solution, based on masking of aluminum with ammonium fluoride, addition of the most EDTA standard solution, complete complexation with gallium, excess EDTA using PAN as an indicator, dropback with copper sulfate standard , Obtain the amount of gallium. However, this method is used in the end of the titration is easy to fade, the end point is difficult to identify the shortcomings of the end point to solve the problem of fast fading, we try to use boric acid to mask excessive fluoride ions, and the amount of boric acid was tested to determine the best Amount. Analysis steps: Take the appropriate amount of sample solution (depending on the amount of gallium) containing 10ml EDTA standard solution (T_ (Ga) =