The Measurement of pH Values in Seawater Using a Cell without a Liquid Junction

P.Ya. Tishchenko; C.S.Wong; G.Yu.Pavlova; W.K.Johnson; D.-J.Kang; K.-R.Kim

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The Measurement of pH Values in Seawater Using a Cell without a Liquid Junction

机译：使用不带液体结的池测量海水中的pH值

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A potentiometric method was developoed for pH measurements in seawater by means of a cell without a liquid junction. Within the conventional pH scale by Pitzer (pH_c), the standard values p(a_H/#gamma#_Na)_S were assigned to three buffered systems: Na_2HPO_4-NaH_2PO_4-NaCl-H_2O of m_HA = m_A = 0.025; TRIS-TRISHCl-NaCl-H_2O of m_TRIS = m_TRISHCl = 0.04 for any NaCl molality; and TRIS-TRISHCl-seawater (TRIS-SW) of m_TRIS = m_TRISHCl = 0.04. By means of a cell without a liquid junction composed of two glass electrodes (GE) osensitive to H~+ and Na~+ ions, a good agreement was shown between the three systems treated. Whereas nowadays no dissociation constants of carbonic acid with respect to the pH_c-scale are available, the buffered system TRIS-SW and the cell GE-Na~+ |studied (standard) solution)| H~+-GE are advocated for the measurements of pH values in seawater with respect to the concentration pH scale (pH_T). The results of the pH_T measurements for the Sea of Japan obtained aboard R/V Prof. Khromov by two techniques-potentiometry with a cell without a liquid junction and spectroophotometry-are compared and discussed.

机译：开发了一种电位计方法，用于通过不带液体连接的电池测量海水中的pH。在通过Pitzer（pH_c）的常规pH值范围内，将标准值p（a_H /＃gamma＃_Na）_S分配给三个缓冲系统：m_HA = m_A = 0.025的Na_2HPO_4-NaH_2PO_4-NaCl-H_2O;对于任何NaCl摩尔浓度，m_TRIS = m_TRISHCl = 0.04的TRIS-TRISHCl-NaCl-H_2O;和TRIS-TRISHCl-海水（TRIS-SW）的m_TRIS = m_TRISHCl = 0.04。借助于没有由两个对H〜+和Na〜+离子敏感的玻璃电极（GE）构成的液体连接的电池，在三个处理过的系统之间显示出良好的一致性。如今，没有相对于pH_c标度的碳酸解离常数，而缓冲系统TRIS-SW和GE-Na〜+细胞研究的（标准溶液）| H〜+ -GE被提倡用于测量海水中相对于浓度pH值（pH_T）的pH值。比较和讨论了Khromov教授在R / V上通过两种技术获得的日本海pH_T测量结果-带液体连接的单元的电位计和分光光度法。

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《Oceanology》 |2001年第6期|共10页
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P.Ya. Tishchenko; C.S.Wong; G.Yu.Pavlova; W.K.Johnson; D.-J.Kang; K.-R.Kim;
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中图分类海洋学;
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机译：使用没有液接的电池测量海水中的pH值
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机译：高温下氧化还原平衡的研究2.自动分压功能高压釜和具有流动液体结的电池，用于水系统的电化学测量。

The Measurement of pH Values in Seawater Using a Cell without a Liquid Junction

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