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当前位置: 首页 > 文章 > 纳米TiO_2富集-单扫描极谱法测定银杏中痕量镉含量的研究 食品科学 2005,26 (4) 215-218
Position: Home > Articles > Study on Determination of Trace Cadmium in Ginkgo Biloba Linn by Nano-TiO_2 Preconcentration-Single-Sweep Polarography FOOD SCIENCE 2005,26 (4) 215-218

纳米TiO_2富集-单扫描极谱法测定银杏中痕量镉含量的研究

作  者：
陈爱英;谢晓峰;徐娟;崔竹梅
单  位：
上海大学环境及化学工程学院;上海交通大学材料与工程学院;常熟理工学院生物系
关键词：
纳米二氧化钛;富集;单扫描极谱法;银杏;镉
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TiO_2富集后,并在不经除去TiO_2的情况下,用单扫描极谱法测定样品中Cd~(2+)含量。实验表明,在pH=7～8条件下,Cd~(2+)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Cd~(2+)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。
译  名：
Study on Determination of Trace Cadmium in Ginkgo Biloba Linn by Nano-TiO_2 Preconcentration-Single-Sweep Polarography
作  者：
CHEN Ai-ying1,XIE Xiao-feng2,XU Juan1,CHUI Zhu-mei1 (1.School of Materials and Engineering, Shanghai Jiaotong University, Shanghai 200030, China; 2.School of Environment and Chemical Engineering, Shanghai University, Shanghai 200072, China; 3.Biology of Department, Changshu Institute of Science and Technology, Changshu 215500, China)
关键词：
nano-TiO_2;preconcentration;single-seep polarography;Ginkgo Biloba Linn;cadmium
摘  要：
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%.

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