摘要
提出了在ｐＨ５的ＨＡｃ－ＮａＡｃ＋ＫＢｒ体系中，加入过量的ＥＤＴＡ溶液与Ｃｒ络合，过剩的ＥＤＴＡ用０．０２ｍｏｌ／Ｌ的ＣｕＳＯ４标准溶液回滴，以Ｃｕ２＋在交流示波极谱ｄＥ／ｄｔ－Ｅ曲线上出现切口直接指示滴定终点测定铬的方法。铬量分析范围为０．８０～１８．００ｍｇ。回收率为９８．８５％～１００．４７％。对于含铬０．ＸＸ％～ＸＸ．ＸＸ％的试样，分析１０次的相对标准偏差为０．２８％～１．１２％。
Excessive EDTA solution is added to the HAc NaAc+KBr system to complex Cr +3 .Residual EDTA is titrated with CuSO 4 standard solution with a concentration of 0.02 mol/L until the occurence of an incision on the dE/dt E curve. Analytical range of chromium is 0.80 ～18.00 mg by weight, chromium recovery is 98.85%～100.47% and the relative standard deviation of 10 samples containing o.xx% xx.xx% Cr is 0.28%～1.12%.
出处
《矿冶工程》
CAS
CSCD
北大核心
1996年第3期54-55,59,共3页
Mining and Metallurgical Engineering
关键词
铬
交流示波
极谱滴定法
矿石
Chromium determination, Cupric sulfate, A.C.Oscillopolarographic titration
