By Thomas R. Crompton

The presence of poisonous natural and inorganic ingredients in rivers and oceanic sediments is partly as a result of man-made pollutants. Their tracking through chemical research of oceanic, estuarine, and river sediments or of organisms residing within the respective ecosystems are of extreme significance. the aim of this booklet is to supply the chemist with all to be had info for the speedy improvement and correct accomplishing of those equipment of study. Crompton's booklet is the 1st ebook which covers all types of samples together with dwelling organisms.

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The precision of the analytical data from the digestion experiments with aqua regia and also with nitric-perchloric acid (5: 1) is only satisfactory iflarge amounts of sediment and acids are used. Nitric-perchloric acid incompletely digests silver and nickel. Microwave oxygen plasma digestion gives excellent precision but cannot be applied in the case of mercury, selenium and arsenic. 1S shows the excellent agreement for total element contents in various reference sediments obtained by pressurized digestion with 3 : 1 nitric-hydrochloric acid.

3, whereas only 2 % of the total iron is removed at the lowest pH. In contrast to the iron group, copper and manganese show a more continuous increase in the amount leached with decreasing pH. 3, > 80 % of the total cadmium and > 50 % of the total manganese are removed from this sample. At higher pH values (4-6), 10-40 % of the total cadmium and manganese is removed. Zinc removal follows the gradual increase with decreasing pH found for the manganese group, but with a small percentage of total metal leached at each pH, a characteristic of the iron group.

Metals 100~~==================J 41 Fig. 3 mol I-I Hel solution (from [38]). 80 Cl c: '2 'iii 60 E !!! 3 mol 1-1 hydrochloric acid extraction, is not suitable for high production largescale laboratory use principally because of the number of manipulations involved and difficulties associated with analyzing the high solids concentration extracts by atomic absorption spectrophotometry. 3 mol 1-1 hydrochloric acid extraction requires fewer manipulations than the citrate-dithionite procedure, yields approximately the same recovery efficiency with minimum structural degradation, and results in an easily analyzed solution.

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