By J. D. H. Strickland
310 pages. Hardcover with dirt jacket. Fisheries study Board of Canada.
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Extra info for A Practical Handbook of Seawater Analysis
E) A little carbon dioxide may be liberated when solutions are acidified but this causes no harm. (f) The acidified iodine solution is stable for many hours or days in most instances but if the water sample contains much organic matter this may be slowly oxidized by the iodine. 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.
0 ml of alkaline iodide solution and mix thoroughly. 0 ml of manganous sulphate solution and mix again. Withdraw approximately 50-ml aliquots into the titration flasks. 00 ml of either 0. 0 1 00 N iodate from a clean 5-ml pipette which should be calibrated as a check on the volume. Allow the iodine liberation to proceed for at least 2 min but not for more than 5 min, during which time the solution should be at a temperature below 25 C and out of direct sunlight. Titrate the iodine with the appropriate thiosulphate solution.
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 ) . A wavelength of 6000 A should be used with a spectrophotometer ( blue-sensitive photocell ) . If a filter-type absorp tiometer is used choose a filter having a maximum transmission near to 6000 A. Unless adjacent samples are known to have extinction values within about 25 % of each other the absorptiometer cell should be rinsed with each new solution before filling.