差示脉冲阳极溶出伏安法测定痕量铊的研究

Study on the Determination of Trace Amounts of Thallium by Differential Pulse Anodic Stripping Voltammetry

在 0 .0 5 0mol·L-1NaAc、0 .0 2 5mol·L-1HAc缓冲溶液 (pH =4.5± 0 .2 )和 0 .2 0mol·L-1EDTA、0 .0 1%聚乙二醇 2 0 0 0 0 (PEG2 0 0 0 0 )、0 .0 2mol·L-1抗坏血液溶液中 ,用悬汞电极 (HMDE)进行差示脉冲阳极溶出伏安法测定Tl(I) .该体系能消除相当于铊 1万倍的Pb(II)、Cd(II)、Cu(II)、Fe(III)、Zn(II)、As(III)、In(III)、Ni(II) ,1千倍的Co(II)的干扰 .应用该法测定了硫酸厂废渣中各化学提取液中的铊 .

In 0.050 mol·l -1 NaAc,-0.025 mol·l -1 HAC buffer solution (pH 4.5±0.2) and 0.20 mol·l -1 EDTA, 0.01% polyethyleneglycol of M. W. 20 000 (PEG20000), 0.02 mol·L -1 asorbic acid solution, the determination of thallous ions has been achieved by differential pulse anodic stripping volammetry (DPASV) at a hanging mercury drop electrode (HMDE). Neither a 1 000_fold ratio of Co(II) nor a 10 000_fold radio of Pb(II),Cd(II),Cu(II),Fe(III),Zn(II),As(III),In(III), Ni(II) to Tl(I) interfere in the determination. Thallium has been determined in chemical extract solution of waste slag from H 2SO 4 factory.