Date of Award

Summer 1985

Document Type


Degree Name

Master of Science (MS)


Ocean & Earth Sciences



Committee Director

George T. F. Wong

Committee Member

Terry L. Wade

Committee Member

Ronald E. Johnson

Call Number for Print

Special Collections LD4331.O35H78


The first and second apparent dissociation constants of carbonic acid in artificial seawater and diluted artificial seawater, K1 ' and K2 1 were determined at selected combinations of temperatures and salinities between 2 to 30° C and 0 to 35 o/oo with special attentions to waters with salinities below 20 o/oo at atmospheric pressure by measuring K1 ' and the product of K1 ' and K2.

The results can be expressed as functions of temperature and salinity by the following equations, pK1 '=3360.206T-1 +0. 033331 T-14.8303-0.09633x (Cl1/2) pK2 '=14911.671 T-1 +0.1645549T-88.6081-0.28623x (Cl1/2) where pK1 ' and pK2' are the negative log of K1 ' and K2 ' respectively, Cl is chlorinity in o/oo, and T is temperature in °K.

My value for pK1' at 35 o/oo and 25°C, a value that has been determined repeatedly by a number of investigators giving a range of 5.857 to 6.000 and an average of 5.954 ± 0.058, is 5.953. My value agrees well with theirs within analytical uncertainties. My results for pK1' at lower salinities are also consistent with previously reported values which were extrapolated from values determined at higher salinities. Furthermore, the theoretical equation of Mook and Keene (1975) is confirmed by the results of this investigation.

My value for pK2' at 35 0/00 and 25°c is 9.208. Previous workers have reported a range of 8.948 to 9.115 with an average of 9.039 ± 0.068. The agreement is fair. My results for pK2' at low salinities are higher than the previously reported values which were extrapolated from values determined at higher salinities.


In Copyright. URI: This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).