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首页> 外文期刊>Analytica chimica acta >Determination of total copper in white wine by stripping potentiometry utilising medium exchange
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Determination of total copper in white wine by stripping potentiometry utilising medium exchange

机译：介质交换溶出电位法测定白酒中总铜。

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A comparison of conventional stripping potentiometry (SP), and SP with medium exchange for the determination of total copper in white wine has been carried out. Medium exchange proved to be beneficial for the longer-term stability of the mercury film, provided mercury(II) was included in the enrichment solution. With an enrichment solution containing 1.0M HCl and 20 mu g ml(-1) mercury chloride, and 4.0 M ammonium acetate as the stripping solution, there is a high degree of correlation between the results obtained by medium exchange SP and inductively coupled plasma-atomic emission spectroscopy (ICP-AES) (r=0.9964). Four-fold analyses of the wine sample with single point standard addition calibration allowed the one him to be used for 32 enrichment-stripping cycles. With conventional SP, in which a high concentration of mercury(II) in the sample matrix is required to achieve fast stripping, significant over-estimation of the copper concentration was observed. The advantages of medium exchange SP compared to conventional SP are identified. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 27]
机译：进行了传统溶出电位法（SP）和带介质交换的SP测定白葡萄酒中总铜的比较。如果富集溶液中包含汞（II），则证明进行介质交换对于汞膜的长期稳定性是有益的。用含有1.0M HCl和20μg ml（-1）氯化汞的浓缩溶液和4.0 M乙酸铵作为汽提溶液，通过介质交换SP和电感耦合等离子体-质谱获得的结果之间存在高度相关性原子发射光谱法（ICP-AES）（r = 0.9964）。通过单点标准添加校准对葡萄酒样品进行四次分析，可将其用于32个富集-去除循环。使用常规SP时，样品基质中需要高浓度的汞（II）才能实现快速汽提，但观察到的铜浓度明显过高。确定了介质交换SP与常规SP相比的优势。 （C）2000 Elsevier Science B.V.保留所有权利。 [参考：27]

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