Transcription of Lecture7 Heavy Metals - Bridgewater State University
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Lecture7 Heavy Metals - Bridgewater State University
1 Lecture 7 Lecture 7 Lecture 7 Lecture 7 TOXIC Heavy METALSTOXIC Heavy METALSTOXIC Heavy METALSTOXIC Heavy Metals Metallic elements that are denser than other common Metals mercury , lead, cadmium and arsenic (a semimetal) present the greatest environmental hazard - WHY? Extensively used Toxic Widely distributed Ultimate sink for Heavy Metals are soils and sediments3 Heavy Metals - DensitiesLight metals43 Toxicity of the Heavy Metals : Of the four, Hg is highly toxic in the elementalform All four are dangerous in the followingform: Cations( from soluble compounds) Organometallic( bonded to organic molecules) exposure through inhalation of Hg vapor from liquid Hg Toxic Heavy Metals : Hg, Pb, Cd and As5Q.
6 Toxic Heavy Metals: Mercury – Cont. Severity of health effects from mercury exposure depends on: the chemical form of mercury; the dose; the age of the person exposed (the fetus is the most susceptible);
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