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Download e-book for iPad: A Practical Handbook of Seawater Analysis by J. D. H. Strickland

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By J. D. H. Strickland

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

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Extra resources for A Practical Handbook of Seawater Analysis

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The following instructions apply directly to this model. 3. Only clean, redistilled mercury should be used and all taps must be care­ fully greased with stopcock grease. Leaks are to be suspected if P1 values (see later) do not duplicate to within 2 mm or if they change by more than 1 mm in the first 2-3 min after compression of the gases. 4. , by experience. Further details and description are given in the papers by Van Slyke and Neill (J. Biol. , 6 1 : 297 and 532, 1 924) , Harlington and Van Slyke (J.

It is advisable, therefore, not to delay the titration. If samples were initially much colder than the temperature of the laboratory they should either be titrated at once or allowed to warm up before acidification. If iodine solutions are allowed to expand on heating to room temperature a small error will be introduced, although this is probably negligible in most instances. Iodine solutions in the BOD bottles or titration flasks must be kept out of direct sunlight. (g) This titration must not be delayed and thiosulphate should be added fairly rapidly.

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. The dense reagent solutions sink at once and as a result only sea water is displaced from the bottle. The outside of the alkaline iodide pipette should not gef contaminated with manganese solutions, for if this occurs, manganese is transferred to the alkaline iodide reagent bottle.

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

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