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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Usefulness of Ytterbium(III) as Analytical Reagent for Total Sulfite Determination in White Wine Samples.
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Usefulness of Ytterbium(III) as Analytical Reagent for Total Sulfite Determination in White Wine Samples.

机译：III（III）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。

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摘要

Ytterbium(III) is used as reagent for the determination of sulfite by measuring the formation of the Yb(III)-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 1-250 mug/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(III) as analytical reagent shows the advantage of its low acute toxic rating.
机译：通过测定光散射强度随时间的变化来测量Yb（III）-亚硫酸盐络合物的形成，将（（III）用作测定亚硫酸盐的试剂。该络合物的低溶解度导致辐射在490 nm处的有效分散，在980 nm处进行了测量。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。使用长发射波长的初始速率方法的应用使来自样品基质的荧光背景信号的潜在干扰最小化。校正图的动态范围是1-250杯/毫升，计算出的检测极限是0.35杯/毫升。表示为相对标准偏差的精度<6％。该方法已应用于白葡萄酒样品中总亚硫酸盐的测定，该方法仅需稀释样品并使用两个等分试样即可提高选择性。但是，红酒的基体效应使该方法不能直接用于这些样品的分析。分析回收率从96.0到106.7％。用建议的方法获得的结果与对-对苯二胺法提供的结果一致。与这种需要毒性试剂的方法不同，the（III）作为分析试剂的使用显示出其低急性毒性等级的优势。

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