Textbook Notes - Chap 10

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University of Toronto Scarborough
Environmental Science
Jovan Stefanovic

Chapter 10 Body Burdens of Industrial Chemicals in the General PopulationPetroleum and other materials are transformed by industrial processes into fuels plastic pesticides cosmetics food additives and pharmaceuticalsResidues of human made substance can now be found in the air soil water and food web in the most remote reaches of the plant Pollutants that are distributed ubiquitously result in universal human exposure through inhalation drinking water and the food supply Some of the substances to which the general human population is exposed resist metabolism and excretion and therefore accumulate in body tissues The quantity of an exogenous substance or its metabolites that has accumulated in an individual or population is defined as a body burden Bodyburden estimationIndividuals body burden of a pollutant is estimated by measuring the concentration of that substance in one or more tissues usually by gas chromatographymass spectrometry Chemical body burdens are complex and dynamic in a number of ways and these characteristics make a full characterization of the general public body burden exceedingly difficultyFirst the body of burden of a pollutant is not stable over time It reflects a dynamic balance between the amount of taken in and the amount excreted or metabolized into another material Second body burdens are not distributed homogenously within an individual the partition
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