【摘要】 <正> 现有的测定镍的容量分析方法很多,但准确、简便、快速者不多。目前最常用的是将Ni²⁺先用丁二酮肟沉淀,过滤,洗涤后,重新溶解,再用EDTA滴定,以红紫酸铵或茜素S为指示剂,滴定时pH控制要求严格。用丁二肟为滴定剂测镍的安培滴定法也有报导,但由于操作麻烦,很少在实际中应用。另外,在氨性溶液中用丁二肟碱性溶液直接滴定镍的办法也有报导,但因使用外指示剂误差较大。更多还原

【Abstract】 In NH4OH-NH4Cl buffer solution, Ni can be directly titrated by standard alcoholic solution of dimethylglyoxime, using the appearanceof the incision on (dE)/(dt) - E curve of dimethylglyoxime to indicate the endpoint of titration. Fe(III), Al(III), Mn(IV), Ti(IV) and Pb(II) which form precipitates in the medium do not interfere. This is an example to show that tedious gravimetric technique can be advantageously replaced by a simpler volumetric technique of oscillopolarographic titration.更多还原