Spectrophotometric pH measurements from river to sea: Calibration of mCP for 0 ≤ S ≤ 40 and 278.15 ≤ T ≤ 308.15 K
Spectrophotometric pH measurements from river to sea: Calibration of mCP for 0 ≤ S ≤ 40 and 278.15 ≤ T ≤ 308.15 K
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DOI：
10.1016/j.marchem.2017.10.001
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发表时间：
2017-12-20
期刊：
影响因子：
3
通讯作者：
Byrne, R. H.
中科院分区：
文献类型：
--
作者：
Douglas, N. K.;Byrne, R. H.
间甲酚紫（mCP）指示剂已广泛用于海水中pH的分光光度测定，近年来也被用于淡水中。然而，以前的工作并没有提供在温带河口的整个温度(T)和盐度(S)范围内进行pH测量所需的纯化mCP（平衡和光谱行为）的全面表征。这项工作首次为适合淡水、河口水和海水的分光光度pH测量提供了一个全面的S和t依赖模型。我们的模型结合了(a)纯水中纯化的mCP (S = 0), (b)海水中纯化的mCP（20）的行为特征
The indicator meta-cresol purple (mCP) has been widely used for spectrophotometric pH measurements in seawater and has been recently used in freshwater as well. Previous works have not, however, provided the comprehensive characterization of purified mCP (equilibrium and spectral behavior) required for pH measurements across the full ranges of temperature (T) and salinity (S) found in temperate estuaries. This work provides, for the first time, a comprehensive S- and T-dependent model for spectrophotometric pH measurements appropriate to freshwater, estuarine water, and seawater. Our model combines previous characterizations of the behavior of (a) purified mCP in pure water (S = 0), (b) purified mCP in seawater (20