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首页> 外文期刊>Journal of Applied Electrochemistry >Simultaneous determination of trace aluminum (III), copper (II) and cadmium (II) in water samples by square-wave adsorptive cathodic stripping voltammetry in the presence of oxine
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Simultaneous determination of trace aluminum (III), copper (II) and cadmium (II) in water samples by square-wave adsorptive cathodic stripping voltammetry in the presence of oxine

机译:在有氧存在下,方波吸附阴极溶出伏安法同时测定水样中的痕量铝(III),铜(II)和镉(II)

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摘要

A validated adsorptive cathodic stripping voltammetry method is described for simultaneous determination of Al(III), Cu(II) and Cd(II) in water samples. In acetate buffer (pH 5) containing 10 mu M oxine, these metal ions were determined as oxine complexes following adsorptive accumulation onto the HMDE at -0.05 V versus Ag/AgCl/KCls. The best signal to noise ratio was obtained using a square wave of scan increment 10 mV, frequency 120 Hz, and pulse-amplitude 25 mV. Limits of detection as low as 0.020 mu g L-1 Al(III), 0.012 mu g L-1 Cu(II) and 0.028 mu g L-1 Cd(II) were achieved. Interference due to various cations (K(I), Na(I), Mg(II), Ca(II), Mn(II), Fe(III), Bi(III), Sb(III), Se(IV), Pb(II), Zn(II), Ni(II), Co(II)), anions (Cl-, NO3-, SO4 (2-), PO4 (3-)) and ascorbic acid was minimal as the measured signals change by 4% at the maximum. The stripping voltammetry method was successfully applied for simultaneous determination of Al(III), Cu(II) and Cd(II) in tap and natural bottled water samples.
机译:描述了一种有效的吸附阴极溶出伏安法,用于同时测定水样中的Al(III),Cu(II)和Cd(II)。在含有10μM牛磺酸的醋酸盐缓冲液(pH 5)中,相对于Ag / AgCl / KCls,这些金属离子在-0.05 V吸附吸附在HMDE上后,被确定为牛复合物。使用扫描增量为10 mV,频率为120 Hz,脉冲幅度为25 mV的方波可获得最佳信噪比。检出限低至0.020μgL-1 Al(III),0.012μgL-1 Cu(II)和0.028μgL-1 Cd(II)。由于各种阳离子(K(I),Na(I),Mg(II),Ca(II),Mn(II),Fe(III),Bi(III),Sb(III),Se(IV) ,Pb(II),Zn(II),Ni(II),Co(II)),阴离子(Cl-,NO3-,SO4(2-),PO4(3-))和抗坏血酸含量最低信号最大变化4%。溶出伏安法成功地用于同时测定自来水和天然瓶装水样品中的Al(III),Cu(II)和Cd(II)。

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