. Carnegie Institution of Washington publication. 92 Carbon-Dioxide Content of Sea-Water at Tortugas. Chloride.—The chloride was titrated with silver nitrate, using potassium chromate as indicator, and the density of the water was calculated with the aid of Knudsen's tables. u -, .092 .090 .088 .086. Cloudy Ram Cloudy Cloudy Rough Fair Fair Ram Fig. 1.—Total carbon dioxide and time of day. H-ion concentration.—The Ph values were estimated colorimetri- cally by comparison with a set of standard tubes very kindly loaned by Professor J. F. McClendon. Excess base.—The excess base was
. Carnegie Institution of Washington publication. 92 Carbon-Dioxide Content of Sea-Water at Tortugas. Chloride.—The chloride was titrated with silver nitrate, using potassium chromate as indicator, and the density of the water was calculated with the aid of Knudsen's tables. u -, .092 .090 .088 .086. Cloudy Ram Cloudy Cloudy Rough Fair Fair Ram Fig. 1.—Total carbon dioxide and time of day. H-ion concentration.—The Ph values were estimated colorimetri- cally by comparison with a set of standard tubes very kindly loaned by Professor J. F. McClendon. Excess base.—The excess base was obtained by titrating 100 c. c. portions with normal sulphuric acid, using methyl red as indi- cator and blowing out the carbon dioxide by means of pure air for Table 1.—Determinations on Sea-Water at Loggerhead Key, Tortugas, June 1919. [t, temperature, °C.; CI, chlorine, grams per kilogram; D, density; Ph, hydrogen-ion concentra- tion expressed as —log [H + ]; Alk., excess base, in terms of a normal solution, or alkalinity titrated with acid, using methyl red and blowing out CO2; CO2, total, gram per liter.] Date, time, and condition of water. June 10, 11, 11. 12. 13, 13, 13, 13, 14, 14, 14, 15, 15, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18 18, 3^3CP ; cloudy. 12 noon; fair 5''30"'p. m.; cloudy. 12 noon; after rain. . GMS" ; after rain 9 50 ; cloudy. , 12 50 ; cloudy. 4 10 9 45 ; after rain and wind 3M5™ ; 5 15 ; . 6 30 ; . 11 7''10™ ; fair 8 15 ; fair 11 ; fair 4''15™ ; fair 5 45 ; fair 6 30 10 15 ; slightly cloudy 4*^45™ ; rainy. . 7 ; after 7''15™ ; after shower 11 ; rain 1 ; rain 26 8 26. S CI
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