摘要
建立了一种可同时测定合金中铜、铅、锌等多组分含量的电位络合滴定方法。用ED-TA与氟化钠的混合溶液作为滴定剂,被滴定液中同时插入了汞膜电极和氟离子选择电极,在滴定过程中的任一滴定点,溶液中汞离子的浓度和滴定剂的加入体积可由两个电极的电位测定值同时获得,从而可应用多元校正法由相应的滴定曲线求得混合金属中每一种组分的含量。该方法免去了直接读取滴定剂的体积,且不需确定滴定终点。应用本方法同时对合金样品中的铜、铅、锌进行了测定,其相对标准偏差为0.18%~0.45%,回收率为99.5%~101.6%。
A new complexometric titration method coupled with multivariate calibration for the simul- taneous determination of multi-components including Cu, Pb, Zn in alloy has been developed. The titrant is a mixture of EDTA and sodium fluoride, both mercury film electrode and fluorinion selective electrode are inserted in the titration solution. In a process of titration, both the added volume of titrant and the concentration of mercury ion at each titration point can be obtained simultaneously from the potentials of two electrodes, and then the concentration of each component in the alloy can be obtained from the titration curves by multivariate calibration. The method is free of volumetric meas- urements and independent of titration end point. The method has been applied for the simultaneous determination of copper, lead and zinc in alloy samples with the relative standard deviation of 0.18% --0.45% and the recovery of 99.5%-101.6%.
出处
《冶金分析》
CAS
CSCD
北大核心
2008年第9期54-57,共4页
Metallurgical Analysis
关键词
铜
铅
锌
电位络合滴定
多元校正
合金
copper
lead
zinc
complexometric titration
multivariate calibration
alloy
