摘要
本文提出了在pH9的0.10mol/L NH_3·H_2O-0.23mol/L NH_4Cl缓冲溶液中,用EDTMP滴定Zn,以Zn在交流示波极谱dE/dt-E曲线上切口消失直接指示终点。所研究的方法已用于测定一些铅锌矿和锌铝合金中的Zn,结果满意。Zn量分析范围为0.900—12.00mg,方法回收率为98.65—101.3％。对于含Zn xx％的试样分析10次相对标准偏差为0.26—1.27％。
A simple method for oscillopolarographic titration of Zn with ethylenediaminetetramethylphosphonic acid (EDTMP) is described. In a buffer solution of pH 9(0.10mol/L NH3f3H2O-0.23mol/L NH4C1), sharp Zn incision is
given on dE/dt-E curves and zinc (0.900-12.00mg) can be titrated directly
with EDTMP. The interfeience of Cu and Al can be masked by sodium die-thyldithiocarbamate and sodium fluoride respectively. High amounts of Pb and Fe in ore samples can be separated by coprecipitation. The recovery of Zn is 98.65-101.3%. The relative standard deviation for the sample containing xx% of Zn is 0.26-1.27%(n=10).
出处
《岩矿测试》
CAS
CSCD
北大核心
1990年第4期274-276,共3页
Rock and Mineral Analysis
关键词
交流
示波极谱
锌
滴定
zinc determination, oscillopolarographic titration, ethylenedia- minetetramethylphosphonic acid (EDTMP)
