By J. D. H. Strickland
310 pages. Hardcover with airborne dirt and dust jacket. Fisheries learn Board of Canada.
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Additional resources for A Practical Handbook of Seawater Analysis
Also needed are 200-ml wide-mouth screw-capped polyethylene bottles, one for each sample. D. SAMPLING PROCEDURE AND SAMPLE STORAGE No great problems are encountered in sampling and storage. The samples are best stored in plastic or in glass bottles that have been soaked for several days in 1 % hydrochloric acid and then rinsed thoroughly in distilled water before they are dried. Evaporation must be prevented by tightly stoppering the containers and it is best to carry out the determinations on the same day as the samples are taken by pipetting the seawater sample directly into standard acid (see Sect.
4. 0 ml of solution ( 100 ml if desired for oxygen contents less than about 0. 1 mg-at 02/Iiter) into a specially painted conical flask by means of a pipette. 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.
SN thiosul phate using a microburette after first removing a small measured volume to allow for the addition of starch. (h ) It is assumed that a BOD bottle has a volume of 300 mi. These bottles will generally be found to be within a few per cent of their nominal volume. Even if they were several milliliters out no significant error would be introduced when 50- or 100-ml aliquots are used. If the whole content (less 20 ml) of the BOD bottle is titrated with a microburette the exact volume of the bottle, Y, becomes more important and should be found (by weighing empty and full of water) and etched on each BOD bottle.