RESUMO
Metallic elements contained in coal, oil and gasoline are mobilized by combustion processes and may be emitted into the atmosphere, mainly as components of submicron particles. The information about the amounts, composition and form of metal compounds is reviewed for some fuels and combustion processes. Since metal compounds are always contained in urban air pollutants, they have to be considered whenever an evaluation of biological impact of air pollutants is made. The value of currently used bioassays for the evaluation of the role of trace metal compounds, either as major biologically active components or as modifiers of biological effects of organic compounds is assessed. The whole animal bioassays for carcinogenicity do not seem to be an appropriate approach. They are costly, time-consuming and not easily amenable to the testing of complex mixtures. Some problems related to the application and interpretation of short-term bioassays are considered, and the usefulness of such bioassays for the evaluation of trace metal components contained in complex air pollution mixtures is examined.
Assuntos
Poluentes Atmosféricos/análise , Carcinógenos Ambientais/toxicidade , Combustíveis Fósseis/análise , Metais/análise , Mutagênicos , Poluentes Atmosféricos/toxicidade , Animais , Combustíveis Fósseis/toxicidade , Humanos , Metais/toxicidade , Centrais ElétricasRESUMO
The composition, environmental fate, and effects of the polybrominated biphenyls (Firemaster BP-6 or FF-1) involved in the accidental contamination of cattle feed in Michigan in 1973 are reviewed. Toxic effects referred to in this report are limited to those occurring in domestic and laboratory animals and include general toxicity, neurobehavioral toxicity, immunotoxicity, reproductive toxicity, mutagenicity and carcinogenicity. The absorption, distribution, biotransformation and elimination of these polybrominated biphenyls are discussed along with the interactions with other chemicals and drugs.
Assuntos
Compostos de Bifenilo/toxicidade , Bifenil Polibromatos/toxicidade , Animais , Comportamento Animal/efeitos dos fármacos , Biotransformação , Carcinógenos , Fenômenos Químicos , Química , Galinhas , Poluição Ambiental/análise , Indução Enzimática/efeitos dos fármacos , Imunidade/efeitos dos fármacos , Absorção Intestinal , Mutagênicos , Bifenil Polibromatos/análise , Reprodução/efeitos dos fármacos , Ovinos , Suínos , Distribuição TecidualRESUMO
Environmental health monitoring and surveillance include activities such as collection of information on the production and use of chemicals; preparation of inventories of waste discharges; measurement of physical, chemical and biological agents in air, water and food, at work place and at home; epidemiological investigations, and collection and analysis of environmental, and health statistical data. There are two main objectives of these activities: estimation of human exposure to potentially harmful environmental factors and timely detection of adverse health effects; and the assessment of environmental conditions in relation to established guidelines and standards. Environmental health monitoring and surveillance projects initiated, organized and implemented by the Specialized Agencies and other bodies of the United Nations system include monitoring of air and water quality and of food and animal feed contamination; pilot projects on air pollution exposure assessment and biological monitoring; and ionizing radiation surveillance. Principles of environmental and health monitoring in occupational environment, and of monitoring and surveillance of environmental health effects are outlined. Two examples are provided of national environmental health surveillance systems.
