By J. D. H. Strickland
310 pages. Hardcover with airborne dirt and dust jacket. Fisheries examine Board of Canada.
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SPECIAL REAGENTS 1 . p-PHENYLENEDIAMINE HYDROCHLORIDE The laboratory reagent should preferably be recrystallized once from alcohol. The recrystallized material is stable for many months if stored dry in a stoppered bottle. 0 g of recrystallized salt in a mixture of 1 00 ml of concentrated hydrochloric acid (sp gr 1 . 1 8 ) and 400 ml of distilled water. This solution, in a stoppered glass bottle, may be kept for 2-3 weeks. 2. FERRIC CHLORIDE SOLUTION Dissolve 10 g of analytical quality anhydrous ferric chloride, FeCl3, in 1 00 ml of concentrated hydrochloric acid (sp gr 1 .
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. Should a precipitate of higher-valency manganese basic oxides appear in the alkaline iodide reagent it must be dis carded. ( b ) The sample can be allowed to stand indefinitely at this stage provided thermal con traction does not draw air into the bottle. (c) The top of the pipette should be placed just beneath the surface.
A suitable model may be obtained from Frederick G. , Cambridge, Massa� chusetts, USA. 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.
A Practical Handbook of Seawater Analysis by J. D. H. Strickland