DETERMINATION OF HYDROGEN-ION CONCENTRATIONS IN SEAWATER FROM 5 TO 40DEGREESC - STANDARD POTENTIALS AT SALINITIES FROM 20 TO 45 PERCENT
DETERMINATION OF HYDROGEN-ION CONCENTRATIONS IN SEAWATER FROM 5 TO 40DEGREESC - STANDARD POTENTIALS AT SALINITIES FROM 20 TO 45 PERCENT
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DOI：
10.1021/ac50009a016
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发表时间：
1977-01-01
影响因子：
7.4
通讯作者：
BATES, RG
中科院分区：
文献类型：
--
作者：
KHOO, KH;RAMETTE, RW;BATES, RG
已有证据表明，海水是一种“恒定离子介质”，稳定了小浓度溶质的活度系数，降低或消除了在测量海水体系pH值时遇到的残余液结电势。在这种情况下，氢离子浓度的实验尺度成为可能。在海水中建立标准参考缓冲溶液所需的H2/Ag；AgCI电池的标准电动势已在盐度为20-45℃和温度为5-40℃的合成海水中进行了测定。在添加了HCI的海水中进行补充测量，得到了在该盐度和温度范围内的生成常数HS04~的值。
Evidence has been presented to show that seawater behaves as a “constant ionic medium”, stabilizing the activity coefficients of solutes present In small concentrations and reducing or eliminating the residual liquid-junction potential encountered in measuring the pH of seawater systems. Under these con-ditions, an experimental scale of hydrogen ion concentration becomes a practical possibility. The standard emf of theH2/Ag; AgCI cell, needed to establish standard reference buffer solutions in seawater, has been determined In synthetic sea-water at salinities from 20 to 45% o and temperatures from 5 to 40 C. Supplementary measurements in seawater to which HCI has been addedlead to values of/} Hso4> the formation constant of HS04~, in this range of salinity and temperature.