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By J. D. H. Strickland

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

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Additional resources for A Practical Handbook of Seawater Analysis

Example text

SULPHIDE 43 with this method but the rate of change of blank extinction values depends somewhat on salt concentration and it is best to prepare standards and blanks with surface ( oxygenated and hence sulphide-free ) sea water. ( b ) After transferring solutions to the 50-ml cylinders, even with as little oxygenation as possible, sulphide oxidation commences and can be detected even after 5-1 0 min. 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.

B. Look up the corresponding aH value from Table V. Bicarbonate concentration : [HC03]I - = carbonate alkalinity X J aH l aH + 2K l J as millimoles/liter. 5. ON CONCENTRATION [C03]2 Required: Carbonate alkalinity, chlorinity or salinity, initial temperature, pH, and the temperature at which the pH was measured, the dissociation constant K. a. Calculate the initial pH of the water from Table III. b. Look up the corresponding aH value in Table V. Carbonate concentration: [C03] 2 - = carbonate alkalinity X K lr aH + 2K lJ as millimoles/liter.

B. OUTLINE O F METHOD The acidified sample is allowed to react with p-phenylenediamine and ferric chloride. A complex oxidation and substitution takes place resulting in the quanti­ tative incorporation of any sulphide-sulphur present into a heterocyclic sulphur­ containing dye called Lauth's violet. The extinction of solutions are measured, before or after dilution, using 1- or 1 0-cm cells. C. SPECIAL APPARATUS AND EQUIPMENT A 50-ml capacity stoppered graduated glass measuring cylinder is needed for each sulphide determination.

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


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