By J. D. H. Strickland
310 pages. Hardcover with airborne dirt and dust jacket. Fisheries study Board of Canada.
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Extra info for A Practical Handbook of Seawater Analysis
The top few milliliters of iodide solution sucked up into a 50-ml pipette should be drawn over and dis carded as they will be slightly deficient in iodine. In very hot laboratories the 50-ml aliquot should be run into a few milliliters of distilled water in the conical flask to which a little potassium iodide ( 1-2 g) has been added to suppress further the vapour pressure of iodine. SN thiosul phate using a microburette after first removing a small measured volume to allow for the addition of starch.
265 liters. The method is particularly suited for the measurement of the relatively small changes in the total carbon dioxide content of a seawater sample that occur as a result of biological processes. Any slight absolute error in the determination is then of minor significance. METHOD A. 5 % jnt of the mean amount found. P1 (see later) vary by more P2 differ by more than 1 mm. 75 % of the mean. B. OUTLINE OF METHOD A 5-ml sample of sea water is acidified with a little acid and the gases, including the carbon dioxide from decomposed carbonate, are liberated by applying a partial vacuum in a Van Slyke gas analyzer.
0 ml of manganous sulphate solution and mix again. Withdraw approximately 50-ml aliquots into the titration flasks. 00 ml of either 0. 0 1 00 N iodate from a clean 5-ml pipette which should be calibrated as a check on the volume. Allow the iodine liberation to proceed for at least 2 min but not for more than 5 min, during which time the solution should be at a temperature below 25 C and out of direct sunlight. Titrate the iodine with the appropriate thiosulphate solution. 01 N thiosulphate. The mean value of f should be found from at least three and preferably five replicates.