【摘要】 采用硝酸-过氧化氢消解银杏样品,以碘化钾-酒石酸钾钠-抗坏血酸-盐酸-四丁基碘化铵的混液作为底液,经纳米级TiO₂富集后,并在不经除去TiO₂的情况下,用单扫描极谱法测定样品中Cd²⁺含量。实验表明,在pH=7～8条件下,Cd²⁺富集率可达90%以上;在底液酸度（HCl=0.05mol/L）、50℃恒温水浴条件下超声波分散5min后的解析率为95%。本方法的线性范围为0.008～1.2μg/ml,检出限为0.002μg/ml,对0.1μg/ml和0.8μg/ml的Cd²⁺溶液重复测定8次,相对标准偏差RSD分别为4.8%、2.5%,回收率在95%～105%之间。更多还原

【Abstract】 The Ginkgo Biloba Linn sample was digested by HNO3-H2O2, and using nanoparticle TiO2 as adsorbent, Cd(Ⅱ) could be determined by single-sweep polarography in supporting electrolytes of KI-NaKC4H4O6-VC-HCl-N(C4H9)4I . The TiO2 needed not to be separated when determining. The results showed that the rate of cadmium adsorption was over 90% at pH=7～ 8. When the eluted conditions were: HCl 0.05mol/L, heated by water-bath at 50℃ and 5-minnute-long radiation of ultrasonic wave, the eluted rate was over 95%. The linear range of this method was 0.008～1.2μg/ml and the detection limit 0.002μg/ml, the RSD 4.8% and 2.5% respectively. Afte assaying eight times (n=8)at 0.1μg/ml and 0.8μg/ml level for Cd(Ⅱ), the recovery was in the range of 95%～105%.更多还原