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我们在文献基础上,考察了黑钨精矿中一些主要元素对PNA与铜显色的影响,将方法应用于钨精矿中微量铜的测定,获得满意结果。试验表明,在50ml显色体积中,有NaF(5%)2ml存在下,下列离子的含量单位与Cu(II)共存时,对20μg铜的显色没有影响(相对误差小于5%):WO_3(8mg),Mn~(2+)(5mg),Mo~(6+)(5mg),Ca~(2+)(3mg),Sn~(4+)(500μg),Zn~(2+)(100μg),Pb~(2+)(80μg),Bi~(3+)(80μg),而铁(Ⅲ)对测定产生正干扰,虽有氟化钠存在,也不能完全消除毫克量铁的影响。采用文献介绍的方法,加入邻菲啰啉破坏PAN-Cu络合物,以褪色试液为参比,至少可以消除5mg铁的影响。因此,可不经分
Based on the literature, we investigated the influence of some major elements in the wolframite concentrate on the color development of PNA and copper. The method was applied to the determination of trace copper in tungsten concentrates, and satisfactory results were obtained. Experiments showed that in the presence of 2 ml of NaF (5%) in the presence of 2 ml NaF (5%) in the 50 ml colorimetric volume, the following units of ions had no effect on the color development of 20 μg copper (relative error less than 5%) in the presence of Cu (2 +) (5mg), Mo 6+ (5mg), Ca 2+ (3mg), Sn 4+ (500μg), Zn 2+ (100 μg), Pb 2+ (80 μg), and Bi 3+ (80 μg), while iron (Ⅲ) produced positive interference with the assay. Although sodium fluoride did not completely eliminate the amount of iron influences. Adopting the method described in the literature, adding phenanthroline to destroy PAN-Cu complex and using fading test solution as a reference can at least eliminate the influence of 5 mg of iron. Therefore, can not be divided