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本文意图用阳极溶出伏安法代替Bush的示波极谱法来测定纯硒中微量镉与铅;以及以硫酸铍本身为支持电解质来代替氯化铍为支持电解质的普通极谱法,借以提高测定的灵敏度。为了分离铟与镉,前人在3M的碘化钠中,使用了镉与铟的还原波,但铟在此底液中的溶出极谱出现两个峰,且在卤化物浓度高时,铟严重地干扰铅的测定,所以我们采用了0.5M溴化钾底液。此时,铅、铟和镉的溶出峰电位依次为-0.34伏(对饱和甘汞电极,下同)、-0.55伏和-0.62伏,可测定20毫升中0.05微克镉和0.4微克铅,与上述示波极谱法的可测下限相当。在硫酸铍介质中,铜、铋、铅、铟、镉和锌的
This article intends to use anodic stripping voltammetry instead of Bush oscillopolarographic method to determine trace amounts of cadmium and lead in pure selenium; and beryllium perchlorate itself as a supporting electrolyte instead of beryllium chloride as a supporting electrolyte of ordinary polarography in order to improve Determination of sensitivity. In order to separate indium from cadmium, the reduction wave of cadmium and indium was previously used in 3 M sodium iodide, but two peaks appear in the elution polarography of indium in this base solution, and when the halide concentration is high, indium Seriously interfere with the determination of lead, so we use a 0.5M potassium bromide solution. At this point, the peak elution peak potentials for lead, indium and cadmium were -0.34 volts (for saturated calomel electrodes, the same below), -0.55 volts and -0.62 volts, and 0.05 micrograms of cadmium and 0.4 micrograms of lead were measured in 20 milliliters The oscillometric polarographic method has a comparable lower limit of detection. In beryllium sulphate medium, copper, bismuth, lead, indium, cadmium and zinc