SafetyReadings_BbLearn_R2

SafetyReadings_BbLearn_R2 - TOXICOLOGY Exposure Limits...

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1 TOXICOLOGY: Exposure Limits References: Safety in Academic Chemistry Laboratories , American Chemical Society, Washington, D.C.: 2003, pp.10-15. Working Safely with Chemicals in the Laboratory , 2nd Ed., Genium Publishing, Schenectady, NY: 1994, pp. 8-17. The toxic effects of chemicals can vary from mild and reversible (e.g., a headache from breathing in the vapors of an organic solvent) to serious and irreversible (e.g., birth defects from excessive exposures during pregnancy). There are several types of toxic effects: Acute poisoning is rapid absorption of the substance. The exposure is sudden and severe; Chronic poisoning is prolonged or repeated exposure of the substance over a duration measured in days, months, or years. Symptoms may not be immediately apparent; Cumulative poisons build up in the body after numerous chronic exposures. Effects are not observed until a critical level in the body is reached. Examples include most heavy metals. Combined substances
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SafetyReadings_BbLearn_R2 - TOXICOLOGY Exposure Limits...

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