By Thomas R. Crompton
The presence of poisonous natural and inorganic ingredients in rivers and oceanic sediments is partly because of man-made pollutants. Their tracking via chemical research of oceanic, estuarine, and river sediments or of organisms dwelling within the respective ecosystems are of extreme value. the aim of this booklet is to supply the chemist with all on hand info for the speedy improvement and correct engaging in of those equipment of study. Crompton's publication is the 1st booklet which covers every kind of samples together with dwelling organisms.
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Digestion at 200°C with 70 % nitric acid in a 120-ml closed vessel produces an internal pressure of 120 psig, whilst digestion with 37 % hydrochloric acid at 153°C produces an internal pressure of 100 psig. 5 a is a temperature-pressure plot obtained for the simultaneous heating of six closed vessels, each containing 20 ml of concentrated nitric acid, at 600 W power. As can be seen, the temperature and pressure rise smoothly to 193°C and 100 psig in 12 min. 5 b is a temperature-pressure plot obtained for the heating of six closed vessels, each containing 20 ml of concentrated hydrochloric acid, at 600 W power.
Acetic acid] to the peroxide treated sample (5-10 g) in a 250-ml conical flask. Place on a mechanical shaker and shake at room temperature for 4 h. Filter through a No. 42 Whatman paper into a 250-ml volumetric flask. Wash the residue on the paper several times with deionized water, combine washings and filtrate, and adjust to volume with deionized water. '" 3 ~ p.. 2 Zn " The digestions were carried out in quartz dishes in an oxygen plasma produced by microwave (International Plasma Corporation 4000).
Add 35 ml concentrated nitric acid and 5 ml 30 % hydrogen peroxide to 5-10 g of sample in a beaker and evaporate to dryness on a hot plate. Ash at 400-425 °c for 1 h in a muffle furnace and cool. 8 gf 100 ml). Heat gently for 15 min and cool for at least 5 min. Separate the residue by filtration or centrifugation, wash the residue twice with deionized water, and combine washings and extract in a 250-ml volumetric flask and adjust to volume with demineralized water. 19. 20. The ashing procedure was used as a reference point to determine the relative recoveries of trace metals because trace metal concentrations recovered by the ashing procedure approach their total concentration in the sediments.