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By J. D. H. Strickland

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

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Biol. , 7 3 : 1 27, 1 927 ) , and in instructions provided by the instrument manufacturers. The special working details given here refer to 2 taps : T1 is the two�way tap connecting the top of the gas chamber with either the sample "cup" or the emptying tube. T2 is the two-way tap connecting the gas chamber and manometer with the mercury reservoir bulb. The latter should have two fixed resting positions. In position H the mercury in the reservoir should be above the tap T1 ; in position L it should be well below the tap T1• In addition, there should be room to lower the mercury reservoir bulb at least 2-!

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. 0-ml aliquot is taken from a 300-ml BOD bottle (Note h ) or . 00 -y X f X v when a X-ml aliquot is taken from a Y-ml bottle. 5 N thiosulphate the expression becomes 250 X fX V 22 mg-at 02/liter = y _ In the above expressions f is a factor obtained as described in Section H. 00 X mg-at 02/liter NOTES (a) Place the pipette just beneath the surface of the water in the BOD bottle.

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. When the solution is acidified in the presence of iodide the oxidized manganese again reverts to the divalent state and iodine, equiva­ lent to the original dissolved oxygen content of the water, is liberated.

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