EESA10H3 Lecture Notes - Lecture 5: Yatsushiro Sea, Mercury Poisoning, Chisso
16 Oct 2017
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Class a: k, na, mg, ca, macronutrients (essential for biological processes, tend to form ionic bond, low toxicity, 2. Class b: hg, pb, ti, nonessential elements, tend to form covalent bond, very toxic (form soluble organometallics, 3. Borderline: cr, cu, as, co, ni, zn, mn, fe, almost all micronutrients, essential in small amounts, toxicity, class b > borderline > class a, mechanism of toxicity, 1. Blocking essential functional groups such as proteins or enzymes, proteins can not carry anything: 2. Displace other metals (class b, borderline: cadmium can displace calcium in human bones, 3. It was caused by the release of methylmercury in the industrial wastewater from the. Chisso corporation"s chemical factory, which continued from (cid:883)9(cid:885)(cid:884) to: this highly toxic chemical bioacumulated in shellfish and fish in. Minamata bay and the shiranui sea, which when eaten by the local population resulted in mercury poisoning. Cat, dog, pig and human deaths continued over more than 30 years.
