By J. D. H. Strickland

310 pages. Hardcover with airborne dirt and dust jacket. Fisheries learn Board of Canada.

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Extra resources for A Practical Handbook of Seawater Analysis

Sample text

The latter should have two fixed resting positions. In position H the mercury in the reservoir should be above the tap T1 ; in position L it should be well below the tap T1• In addition, there should be room to lower the mercury reservoir bulb at least 2-! feet below the apparatus so as to pull a vacuum in the gas chamber. A small ( 1 00-ml) beaker is needed to receive used sample and waste solutions and any mercury expelled through the emptying tube. 2 ml sodium hydroxide solution are also needed.

3. 9 the total alkalinity may be read directly from Table VII without incurring appreciable errors. OlOOON acid into the bottle. Mix the solution and again measure the pH. II. 1 pH unit. For use these tables should be made the basis of graphical interpolations. 1. CALCULATION OF THE CARBONATE ALKALINITY Required: Total alkalinity, chlorinity or salinity, initial temperature, pH, and the temperature at which the pH was measured. a. Calculate the initial pH of the water from Table III. b. Look up the quantity A (milliequivalents per liter) in Table VIII.

The solution is stable for many months provided that air is excluded. 3. MERCURY A small dropping bottle of pure mercury with a "pen-filler" stopper is required. F. EXPERIMENTAL PROCEDURE Note: Rinse the gas chamber immediately before and after each determination by adding the cupful ( 5-6 ml) of sulphuric acid reagent to the gas chamber, pulling the mercury in the gas chamber down to just below the 50-ml graduation and up again and finally expelling the solution through the emptying tube. " 1 .

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