SEMIDIFFERENTIAL ELECTROCHEMICAL STRIPPING ANALYSIS FOR THE DETERMINATION OF TRACE HEAVY METALS IN SEAWATER

A new voltammetric technique has been described for the determination of trace Cu, Pb, Cd and Zn in seawater by semidifferential electrochemical stripping analysis, in which the semiderivative, e, of the stripping current, i, is measured as a function of electrode potential, at a rotating thin mercury film glassy carbon electrode formed in situ. The optimun conditions are reported. It is demonstrated that the technique has more merits than that of the ordinary linear sweep anodic stripping voltammetry, greatly enhances the sensitivity and resolution and shortens the time of pre-electrolysis.     

半微分电分析法在海洋化学中的应用——Ⅰ.半微分电化学溶出法测定海水中痕量重金属

海水中重金属铜、铅、镉、锌等的测定已日益广泛地应用阳极溶出伏安法.在阳极溶出分析中有各种各样的检测方法,其中较为普遍使用的是线性扫描伏安法,该法虽然具有快速的优点,但在测定低浓度样品时,由于有较大的充电电流干扰,限制了灵敏度的提高.而微分脉冲极谱法可克服此缺点,灵敏度较高,但扫描时间较长,且仪器线路复杂.