论文部分内容阅读
通常用极谱法在盐酸溶液中测定铅时,铅的还原电位和锡很靠近。З.С.木痕娜曾提出青铜中铅的极谱测定:当铅的含量高于0.5%时使用15%的磷酸底液,锡的波便不出现,而铅的波在这条件下却很好地显出。А.С.沙霍夫为要同时用极谱法测定铌氟化钾和金属铌中的铅和锡,用碱性的柠檬酸钠溶液,并用酚酞消除铅的畸峰,在这条件下铅的半波电位接近于-0.6伏特,而二价锡的还原电位约为-0.85伏特。但他并未指出当这些元素在各种不同浓度下共存时是否可能测定。为了要在任意量的锡的存在下测定铅,我们
Usually when polarography is used to determine lead in hydrochloric acid solution, the reduction potential of lead is very close to that of tin. З.С. Mukuna had proposed the polarographic determination of lead in bronze: When the lead content is higher than 0.5%, 15% phosphoric acid bottom solution is used, and the tin wave does not appear, and the lead wave is under this condition Good to show. А.С. Shahov To simultaneously determine lead and tin in niobium and potassium niobates and niobium metal by polarography, use alkaline sodium citrate solution and phenolphthalein to eliminate the peak of lead. Under these conditions, lead The half-wave potential is close to -0.6 volts, while the bivalent tin has a reduction potential of about -0.85 volts. However, he did not indicate whether it is possible to determine when these elements co-exist at various concentrations. To measure lead in the presence of any amount of tin, we