By P. D. Vowles and D. W. Connell (Auth.)
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Additional resources for Experiments in Environmental Chemistry. A Laboratory Manual
Heavy aflatoxin contamination has been found in food samples taken from parts of Africa and South-East Asia, areas where there is a high incidence of liver cancer among the population. Experimental studies with rats have show aflatoxins to be extremely potent liver carcinogens, Aflatoxin B^ being the most potent of all known substances. K. USA EEC countries 65 Commodity nuts and their derived products animal feed food groundnut flour for food use groundnut cake (export) all foods groundnuts cake for animal feed mixes foods and feeds all foods and feeds groundnuts animal feed all foods, particularly Brazil nuts.
6^ 321 (1979). Anon (1973), Environmental Health Aspects of Lead^ European Communities, Luxembourg,. L. (1978), Health Effects of Environmental Pollutants^ Edn. Mosby, Saint Louis. 2nd Anon (1977), Environmental Health Criteria^ No. 2 Leady World Health Organ isation, Geneva. 7% rare gases such as Krypton, Xenon and Argon. In addition there are highly variable amounts of water present either as vapour or as droplets and many other chemical substances in trace amounts. Substances present in the air are regarded as pollutants if they are present in concentrations toxic to man, animals or plants, have an odour or in some other way irritate our senses; obscure visibility or damage property.
Fig. 2 illustrates the plot for the 14-hr observation. 3 Copper concen tration mg/l Shrimp Mortality Data Number of tests animals surviving after: 30min, . 0 10 10 10 10 10 10 9 9 9 Fig. 2 shows that the data may be fitted to a sigmoid curve. This type of curve is expected of natural populations. Most shrimp behave close to the "average", and succumb to a narrow range of toxicant concentration. However, a few shrimp display particular sensitivity or resistance to the toxicant. 48 EXPERIMENTS IN ENVIRONMENTAL CHEMISTRY 100 T3 •H o o +-> c <ü υ μ α- 2 5 10 20 40 60 Copper Concentration, mg/1 Fig.
Experiments in Environmental Chemistry. A Laboratory Manual by P. D. Vowles and D. W. Connell (Auth.)