New PDF release: A Practical Handbook of Seawater Analysis
By J. D. H. Strickland
310 pages. Hardcover with dirt jacket. Fisheries learn Board of Canada.
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Extra resources for A Practical Handbook of Seawater Analysis
Required: Carbonate alkalinity (see 1 above) , 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 factor FP in Table X. c. Calculate the partial pressure of carbon dioxide, (P co2 ) , from the express- . lOll : P co 2 = carbonate alkalinity x FP ( atmospheres) . d. Look up the solubility of carbon dioxide in unbuffered sea water of the appropriate salinity and temperature in Table XI.
Solutions should remain colourless for at least 20 sec at the end point. A creeping end point is due to atmospheric oxidation of iodide to iodine which becomes increasingly rapid as the pH is lowered. At the present pH (ca. 3) no trouble should be encountered for many minutes. Another source of error, the volatilization of elemental iodine, depends mainly on temperature and is not serious in the present method at temperatures less than about 25C pmvided that titrations are rapid and are commenced directly aliquots are added to the conical flask.
01 N thiosulphate solution UI,ltil a very pale straw colour remains. Add 5 ml of starch indicator and conclude the titration (Note g ) . 5. 5 N thiosulphate. 5 ml into a 25-ml gradu ated measuring cylinder. Place a small magnetic stirring bar into the bottle and titrate with the stem of the Gilmont microburette well immersed in the bottle. Use 1 0 ml of starch solution to detect the end point. 6. Subtract any blank correction (see Sect. G) from the titration to obtain the corrected titration, V ml, and calculate the oxygen content of a sample from the formulae : mg-at 02/liter = 0.
A Practical Handbook of Seawater Analysis by J. D. H. Strickland