• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Electrochemical Science >Direct Quantification of Cu2+ in Cacha?a Using a Solid Paraffin-Based Carbon Paste Electrode Chemically Modified with 2-Aminothiazole-Silica-Gel
【24h】

Direct Quantification of Cu2+ in Cacha?a Using a Solid Paraffin-Based Carbon Paste Electrode Chemically Modified with 2-Aminothiazole-Silica-Gel

机译：使用2-氨基噻唑-硅胶-凝胶化学修饰的固​​体石蜡基碳糊电极直接定量测定茶中的Cu 2 +

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A solid paraffin-based carbon paste electrode modified with 2-aminothiazole-silica-gel (SPCPE-SiAt)2+ was used for direct quantification of Cu in sugarcane spirits (cacha莽a) samples by anodic strippingvoltammetry. The composite formed between carbon powder and solid paraffin was totally stable in2+ ethanol/water mixtures enabling the quantification of Cu directly in the samples without any-1 pretreatment procedure. Under optimized conditions, LOD and LOQ were, respectively 1.8 mol L-1 -1 -1 2+ (0.11 mg L ) and 5.4 mol L (0.33 mg L ). These values are remarkably below the maximum Cu-1 -1 content allowed by Brazilian (5 mg L ) and European legislation (2 mg L ). This fact strongly2+ suggests that the proposed method can be adopted for cacha莽a quality control regarding Cu content.Four commercial samples were analyzed by using the proposed method and the results were comparedwith those obtained from FAAS official method. t-test has shown that there are no statisticaldifferences between the results provided by both methods at 95% confidence level. In addition, F-testshowed that the precision of these methods are statistically equivalent. These results are a cleardemonstration of the good accuracy of the proposed electroanalytical method.
机译：用2-氨基噻唑-硅胶（SPCPE-SiAt）2+改性的固体石蜡基碳糊电极用于通过阳极溶出伏安法直接定量甘蔗酒（cacha莽a）中的铜。碳粉和固体石蜡之间形成的复合物在2+乙醇/水混合物中是完全稳定的，无需任何1预处理程序就可以直接直接定量样品中的Cu。在优化的条件下，LOD和LOQ分别为1.8 mol L-1 -1 -1 2+（0.11 mg L）和5.4 mol L（0.33 mg L）。这些值明显低于巴西（5 mg L）和欧洲法规（2 mg L）所允许的最大Cu-1 -1含量。这一事实强烈表明该方法可用于铜含量的质量控制。使用该方法分析了四个商业样品，并将结果与​​FAAS官方方法进行了比较。 t检验表明，两种方法在95％置信水平下提供的结果之间均无统计学差异。此外，F检验表明这些方法的精度在统计上是等效的。这些结果清楚地证明了所提出的电分析方法的良好准确性。

著录项

相似文献

  • 外文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号