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

By J. D. H. Strickland

310 pages. Hardcover with airborne dirt and dust jacket. Fisheries learn Board of Canada.

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Sample text

Dilute this solution exactly ten­ fold, by a pipette and measuring flask, before use. 2. 00 at 20-25 C) . 21 g of analytical reagent quality (primary buffer-standard speci­ fication ) potassium hydrogen phthalate, KHC8H404, in distilled water and make the volume to 1 000 ml in a measuring flask. Store in a glass bottle. The solution is stable almost indefinitely in the absence of evaporation. The formation of a slight turbidity introduces no error. F. 01000 N hydrochloric acid into a dry 200-ml polyethylene wide-mouth screw-cap bottle.

Samples must be drawn into the BOD bottles immediately after they are taken and should be the first samples to be drawn from a reversing bottle. This is particu­ larly important when using Van Dorn bottles of large capacity and when analysing water from a depth where there is considerable undersaturation with respect to oxygen. The sampling delay should never exceed 1 5 min. When the bottles are filled the analysis should be commenced in less than 1 hr as oxygen may be lost when the samples warm to room temperature or by microbiological respiration.

0 ml of ferric chloride solution and invert twice. Within the next 1-2 min invert the cylinder once or twice more (Note c ) . 4. Allow the solution to stand for 1 0 min but preferably no more than 20 min (Note d) . Measure the extinction of the solution against the blank (not distilled water ) in a 1 0-cm or 1 -cm cell (Note d) . 0 in a 1 -cm cell transfer 5 . 0 ml with a pipette to another clean 50-ml stoppered measuring cylinder, dilute to 50 ml with distilled water and measure the extinction in a 1 -cm cell against a blank similarly diluted (Note e ) .

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

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