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By J. D. H. Strickland

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

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Example text

E) to the nearest 1 C, adjusting it, if necessary, so that the temperature lies between 20 and 25 C. 87, then standardize the instrument according to the maker's instructions, allowing 5 min for the electrodes to reach equilibrium. 87 will be effective for the pH range 7-9 . With a satisfactory meter and electrodes the standardization need be repeated only once a day. Place the s amples in a thermostatically controlled water bath until they attain a temperature within ± 3 C of the temperature at which the pH meter was standardized.

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. 4. DETERMINATION OF CARBONATE, BICARBONATE, AND FREE CARBON DIOXIDE FROM pH AND ALKALINITY MEASUREMENTS DEFINITIONS TOTAL ALKALINITY Total alkalinity is the number of milliequivalents of hydrogen ion that are neutralized by 1 kg of sea water when a large excess of acid is added. 5. The total alkalinity is often expressed per liter (20 C ) rather than per kilogram.

2 . 2 8 N ) Dissolve 4 9 g of good quality silver nitrate for each liter of final solution. Use distilled water and store the solution in a dark bottle. The solution may need dilution with a little water to bring it to the desired strength, as described in Section H. The solution shouid be well mixed in the bottle once each day or prior to each batch of titrations. 3. 5 g of analytical quality potassium chromate, K2Cr04, in each liter of distilled water. F. EXPERIMENTAL Add the sample of sea water t o a 200-ml spoutless tall-form beaker by means of the automatic 10-ml pipette and then add 15 ml of indicator-diluent solution.

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A Practical Handbook of Seawater Analysis by J. D. H. Strickland

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