By T.R. Crompton
This practice-oriented guidebook collects approximately all equipment released because 1975 at the chemical research of seawaters. exact descriptions of either classical and such a lot complicated physico-chemical and chemical innovations together with forty five tables and forty eight figures make this quantity a useful resource for analysts, oceanographers, fisheries specialists, politicians and selection makers engaged in seawater environmental defense. The equipment are awarded in a logical demeanour in order that the reader can easily discover ways to practice them.
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Additional info for Analysis of Seawater : A Guide for the Analytical and Environmental Chemist
Of the other two most favoured poisons, sodium azide proved to be ineffective in stopping bacterial activity at concentrations as high as 10 mg/l; and cyanide, although effective at levels between 1 and 10 mg/l, interfered with many of the chemical reactions. Acidiﬁcation with mineral acids is also often used as a method for preservation of organics. It would be expected that the distribution of organic compounds would be changed by such treatment, even if the total amount of dissolved organic carbon were not appreciably altered.
3 Sample Preservation and Storage If we were to choose the ideal method for the analysis of any component of seawater, it would naturally be an in situ method. Where such a method is possible, the problems of sampling and sample handling are eliminated and in many cases we can obtain continuous proﬁles rather than limited number of discrete samples. In the absence of an in situ method, the next most acceptable alternative is analysis on board ship. A “real-time” analysis not only permits us to choose our next sampling station on the basis of the results of the last station, it also avoids the problem of the storage of samples until the return to a shore laboratory.
Microbial action can affect this, should be one of the ﬁrst analyses of the sample. Refrigeration Refrigeration is only partially effective. Analysis is best done immediately. Large changes can occur over a few hours. Glass bottles preferred 1 Refrigeration Changes can occur quite rapidly with some sam2 acidiﬁcation with sulfuric ples. Glass bottles preferred. DoE recommendaacid to pH 2 tion. Hydrolysis can occur over longer periods. Immediate analysis No storage possible. Addition of ascorbic acid, then render alkaline to pH 11–12 with sodium hydroxide Winkler reagents This determinand must be preserved immediately.
Analysis of Seawater : A Guide for the Analytical and Environmental Chemist by T.R. Crompton