...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Agricultural and Food Chemistry >Usefulness of Ytterbium(lll) as Analytical Reagent for Total Sulfite Determination in White Wine Samples
【24h】

Usefulness of Ytterbium(lll) as Analytical Reagent for Total Sulfite Determination in White Wine Samples

机译：l作为分析试剂用于白葡萄酒样品中总亚硫酸盐测定的有用性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Ytterbium(lll) is used as reagent for the determination of sulfite by measuring the formation of the Yb(lll)-sulfite complex through the variation of the light scattering intensity with time.The low solubility of this complex causes an efficient dispersion of the radiation at 490 nm,which is measured at 980 nm.Each kinetic datum is automatically obtained in only 0.5 s by stopped-flow mixing technique.The application of the initial rate method using a long emission wavelength minimizes the potential interference of fluorescent background signals from the sample matrix.The dynamic range of the calibration graph is 1-250mug/mL,and the calculated detection limit is 0.35/mug/mL.The precision,expressed as relative standard deviation,is <6%.The method has been applied to the determination of total sulfites in white wine samples,which requires only the sample dilution and the use of two aliquots to improve selectivity.However,the matrix effect found for red wines precludes the application of the method to the direct analysis of these samples.Analytical recoveries ranged from 96.0 to 106.7%.The results obtained with the proposed method agreed with those provided by the p-rosaniline method.Unlike this method,in which toxic reagents are required,the use of ytterbium(lll) as analytical reagent shows the advantage of its low acute toxic rating.
机译：l用作测定亚硫酸盐的试剂，通过测量光散射强度随时间的变化来测量Yb（III）-亚硫酸盐配合物的形成，该配合物的低溶解度可有效分散辐射在490 nm处测量，在980 nm处进行测量。通过停止流混合技术仅在0.5 s内即可自动获得每个动力学数据。采用长发射波长的初始速率方法的应用可最大程度地减少来自荧光背景信号的潜在干扰校正图的动态范围为1-250mug / mL，计算出的检出限为0.35 / mug / mL。以相对标准偏差表示的精密度<6％。测定白葡萄酒样品中的总亚硫酸盐，仅需稀释样品并使用两个等分试样即可提高选择性。但是，红酒中的基质效应无法应用t该方法可直接分析这些样品。分析回收率在96.0至106.7％之间。建议的方法所获得的结果与对-rosaniline方法所提供的结果相符。与该方法不同，该方法需要使用有毒试剂，因此使用（III）作为分析试剂显示出其低急性毒性等级的优势。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 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