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5.2.Definition
Unit 5 : Heavy metal pollution
5.2.Definition
The term heavy metal refers to any metallic chemical element that has a relatively high density (Atomic weight between 63.00 – 200) and a specific gravity greater than 4.0 and is toxic or poisonous at low concentration.
There are 35 metals which are of concerned to as (occupational exposure) belonging to lanthanides and actinides (they belong to atomic numbers of 22-34 and 40-52).
The examples of metals are : antimony, arsenic, bismuth, cadmium, cerium, chromium, cobalt, gathium, gold, iron, lead, manganese, mercury, nickel, platinum, silver, selenium, tellurium, thallium, tin, uranium, vanadium, zinc,etc.
Living organisms require trace amounts of some heavy metals to maintain the metabolism of the body. Such metals are called essential metals.
The examples of such metals are : cobalt, copper, iron, manganese, molybdenum, and zinc.The non -essentials metals that are of concerns to us are cadmium, chromium, mercury, lead, arsenic, antimony and thallium. These metals are non metabolized by the body and accumulate in the soft tissues and become toxic.
The term heavy metal refers to any metallic chemical element that has a relatively high density (Atomic weight between 63.00 – 200) and a specific gravity greater than 4.0 and is toxic or poisonous at low concentration.
There are 35 metals which are of concerned to as (occupational exposure) belonging to lanthanides and actinides (they belong to atomic numbers of 22-34 and 40-52).
The examples of metals are : antimony, arsenic, bismuth, cadmium, cerium, chromium, cobalt, gathium, gold, iron, lead, manganese, mercury, nickel, platinum, silver, selenium, tellurium, thallium, tin, uranium, vanadium, zinc,etc.
Living organisms require trace amounts of some heavy metals to maintain the metabolism of the body. Such metals are called essential metals.
The examples of such metals are : cobalt, copper, iron, manganese, molybdenum, and zinc.The non -essentials metals that are of concerns to us are cadmium, chromium, mercury, lead, arsenic, antimony and thallium. These metals are non metabolized by the body and accumulate in the soft tissues and become toxic.
Last modified: Monday, 13 June 2011, 9:39 AM