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首页> 外文期刊>Analytica chimica acta >pH, alkalinity and total CO2 in coastal seawater by potentiometric titration with a difference derivative readout
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pH, alkalinity and total CO2 in coastal seawater by potentiometric titration with a difference derivative readout

机译：电位差滴定电位差滴定法测定沿海海水的pH，碱度和总CO2

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摘要

A method for measuring three components of the CO2 system, pH, alkalinity (A(t)) and total CO2 (TCO2) in coastal seawater is presented. The measurements are sufficiently precise to register CO2 changes of biological origin in surficial and coastal waters or in culture media. The method is based on a modified potentiometric titration of seawater with acid in a custom-built cell with the data plotted as a difference derivative, giving two peaks from which total carbonate and alkalinity can be computed. pH is calculated directly from the initial millivolt reading of the sample. One important aspect of this technique is that, unlike a Gran titration, the measured values of pH, A(t) and TCO2 are independent of any pre-conceived seawater model. In this work we demonstrate that the relative position of the two peaks (used for determining TCO2) is relatively insensitive to interferences from dissolved organic matter to about 1 x 10(-4) M, while peak height is sensitive to it. This last observation permits the detection of organic bases which might be included in the measurement of alkalinity. (C) 1999 Elsevier Science B.V. All rights reserved. [References: 19]
机译：提出了一种测量沿海海水中CO2系统的三个组成部分，pH，碱度（A（t））和总CO2（TCO2）的方法。这些测量足够精确，可以记录表层和沿海水域或培养基中生物起源的二氧化碳变化。该方法基于改进的电位滴定法，在定制电池中用酸对海水进行滴定，并将数据绘制为差分导数，给出两个峰，可从中计算出总碳酸盐和碱度。 pH是直接从样品的初始毫伏读数中计算得出的。该技术的一个重要方面是，与Gran滴定法不同，pH，A（t）和TCO2的测量值独立于任何预先设想的海水模型。在这项工作中，我们证明了两个峰的相对位置（用于确定TCO2）对溶解的有机物至大约1 x 10（-4）M的干扰相对不敏感，而峰高对它敏感。最后的观察结果允许检测可能包含在碱度测量中的有机碱。 （C）1999 Elsevier Science B.V.保留所有权利。 [参考：19]

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