SPECTROPHOTOMETRIC SEAWATER PH MEASUREMENTS - TOTAL HYDROGEN-ION CONCENTRATION SCALE CALIBRATION OF M-CRESOL PURPLE AND AT-SEA RESULTS

被引：562

作者：

CLAYTON, TD

BYRNE, RH

机构：

[1] Department of Marine Science, University of South Florida, St Petersburg

来源：

DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS | 1993年 / 40卷 / 10期

关键词：

D O I：

10.1016/0967-0637(93)90048-8

中图分类号：

P7 [海洋学];

学科分类号：

0707 ;

摘要：

Spectrophotometric open-ocean seawater pH measurements are simple, fast and precise. The sulfonephthalein indicator m-cresol purple (mCP) is recommended for open-ocean surface-to-deep pH measurements. The salinity- and temperature-dependence of such measurements (293 less than or equal to T less than or equal to 303 and 30 less than or equal to S less than or equal to 37) is given as: [GRAPHICS] on the total hydrogen ion concentration scale ([H+](T) = [H+](f) + [HSO4-]), in units of mol.(kg-soln)(-1). R is the ratio of indicator absorbances at molar absorptivity maxima (i.e. R = (578)Al(434)A). The at-sea analytical precision of the technique, evaluated on two recent NOAA cruises, is approximately 0.0004 pH units.

引用

页码：2115 / 2129

页数：15

共 31 条

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