By J. D. H. Strickland
310 pages. Hardcover with airborne dirt and dust jacket. Fisheries learn Board of Canada.
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Extra resources for A Practical Handbook of Seawater Analysis
Milliequivalents total alkalinity per liter. Reject duplicate determinations if the pH values after acidification (see Sect. F and Note 2, Sect. 03. B. 0100 N hydrochloric acid. The pH of the resulting solution is measured. The standard acid in excess of that required to titrate the sample to the carbon dioxide inflection point is computed from a knowledge of this pH and an empirical factor. 01 N acid ) and the total alkalinity of the sample is thus evaluated. C. SPECIAL APPARATUS AND EQUIPMENT A Beckman Model G pH meter, or an instrument of similar specification, should be employed with "wide-range" ( - 5 to 80 C, pH 0-1 1 ) glass electrodes and saturated calomel half-cell electrodes.
If a 1 0-cm cell is used multiply the value for F by 0. 1 . If a dilution is made multiply the factor by 1 0. 0224 X pg-at S/liter NOTES (a) There is little temperature effect but if solutions are colder than 10-15 C rather more than 10 min may be necessary for full colour development (see F. 4 ) and if temperatures exceed 25-30 C the dangers of sulphide losses (Note c ) increase. 6. SULPHIDE 43 with this method but the rate of change of blank extinction values depends somewhat on salt concentration and it is best to prepare standards and blanks with surface ( oxygenated and hence sulphide-free ) sea water.
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. 5 . Calculate the sulphide concentration in microgram-atoms of sulphur per liter ( ,�g-at S/liter) from the expression : pg-at S/liter = extinction X F where F is a factor obtained as described in Section H, below, for a 1 -cm cell.
A Practical Handbook of Seawater Analysis by J. D. H. Strickland