By J. D. H. Strickland
310 pages. Hardcover with airborne dirt and dust jacket. Fisheries examine Board of Canada.
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310 pages. Hardcover with dirt jacket. Fisheries study Board of Canada.
Additional resources for A Practical Handbook of Seawater Analysis
The analysis should not be delayed more than a few minutes. (c) After the p-phenylenediamine solution is added oxidation rates increase and, for this reason, the analysis must not be delayed. Some hydrogen sulphide gas will collect in the air space above the liquid. Cylinders (50-ml) , which are generally nearly filled by 55 ml of liquid, are used deliberately to keep the air space to a minimum. When the ferric chloride is added both reagents are mutually destructive and no longer react after about 5 min.
Reintroduce the expelled acid and make a fresh mercury seal as described in 1 above. Add about 1 ml of excess mercury to the cup and then thoroughly dry the cup and mercury surface with a spill of absorbent paper tissue. Have the reservoir at L and tap T2 open. 4. Rinse the Van Slyke pipette by filling and emptying once with sample. Fill the pipette and lower the solution level to the top mark. Wipe the pipette sides and tip with tissue and introduce the pipette into the cup with the end pushed snugly into the top of the cup capillary and the rubber tube overlap making a cushion and seal.
Fill a 250-ml measuring flask to the top with distilled water and remove oxygen by passing nitrogen gas for several hours. Add 1-5 mg of anhydrous sodium carbon ate to ensure that the water is slightly alkaline. 0 ml of stock sulphide. The final volume need not be exactly 250 ml but liquid should now nearly fill the 44 A PRACTICAL HANDBOOK OF SEAWATER ANALYSIS measuring flask. Invert several times to mix.
A Practical Handbook of Seawater Analysis by J. D. H. Strickland