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二氧化锡中Pb、Cu、Bi的测定,未见较好的方法,我们在4%NaAc—0.1%(CH_2)_6N_4—1%Vc—1.2%KI体系测定Pb;在1%Vc—2%NaAc—0.0001 M EDTA—0.2%KSCN中测定Cu和Bi获得了满意的结果。1000倍Cu(Ⅱ)、200倍于Pb的Sn(Ⅱ)、Fe(Ⅲ)、Sb(Ⅴ)、Bi(Ⅲ)、A1(Ⅲ)、Cr(Ⅲ)、Ca(Ⅱ)、Mg(Ⅱ)不干扰测定。在测定铜的体系,Pb(Ⅱ)被EDTA掩蔽,Fe(Ⅲ)被抗坏血酸(Vc)还原不干扰Cu、Bi的测定,动态测定范围:Cu、Pb为0.0l～2.5μg·ml~(-1),Bi为0.1～10μg·ml~(-1)。
In the determination of Pb, Cu and Bi in tin dioxide, no good method was found. Pb was determined in a 4% NaAc-0.1% (CH 2) 6N_4-1% Vc-1.2% KI system; Satisfactory results were obtained for the determination of Cu and Bi in NaAc-0.0001 M EDTA-0.2% KSCN. (Ⅱ), Fe (Ⅲ), Sb (Ⅴ), Bi (Ⅲ), Al (Ⅲ), Cr (Ⅲ), Ca (Ⅱ) ) Does not interfere with the assay. In the determination of copper system, Pb (Ⅱ) was masked by EDTA and the reduction of Fe (Ⅲ) by ascorbic acid (Vc) did not interfere with the determination of Cu and Bi. The dynamic measurement range was: Cu and Pb were 0.0l ~ 2.5μg · ml ~ 1), Bi is 0.1 ~ 10μg · ml ~ (-1).