A Practical Handbook of Seawater Analysis, 2nd Edition by J. D. H. Strickland

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, 2nd Edition (Fisheries Research Board of Canada, Bulletin No. 167)

Sample text

Oxygen concentrations below 0. 0015 mg-at/liter too low. This amount is scarcely significant. B . OUTLINE OF METHOD A divalent manganese solution, followed by strong alkali, is added to the sample. The precipitated manganous hydroxide is dispersed evenly throughout the seawater sample which completely fills a stoppered glass bottle. Any dissolved oxygen rapidly oxidizes an equivalent amount of divalent manganese to basic 21 22 ' A PRACTICAL HANDBOOK op SEAWATER ANALYSIS hydroxides of higher valenc)l states.

0 ml of alkaline iodide solution (Note a) . Restopper the bottle immediately and mix the contents thoroughly by shaking until the precipitated manganous-manganic hydroxide is evenly dispersed. No air bubbles should be trapped in the bottle. 2. When the precipitate has settled slightly (in 2-3 min) shake the bottles again. Finally allow the samples to stand until the precipitate has settled at least one third of the way down the bottle leaving a clear supernatant solution (Note b ) . It is best practice to allow the solution to warm to room temperature at this stage (Note f) .

Gast and Thompson, A nal. 25. The method for determining total alkalinity that is. described here is taken from Anderson and Robinson (Ind. Eng. Chern. [Anal. Edition] 1 8 : 767, 1 946 ) and is sufficiently precise for most purposes. The method acts as a check of the specific alkalinity. As the latter is near 0. 1 23 in most sea areas it is only necessary to make alkalinity measurements on samples taken at great depths or at inshore locations where there is marked land drainage or where active carbonate precipitation is suspected.

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