Write short notes Classification of trace elements.
Answers
There are the essential trace elements. An element is called as trace elements when their requirement per day is below 100 mg and deficiency leads to disorders and may prove fatal. The elements belonging to this group are copper, iron, zinc, chromium, cobalt, iodine, molybdenum, and selenium.
A trace element is a chemical element whose concentration (or other measure of amount) is very low (a "trace amount"). The exact definition depends on the field of science:
In analytical chemistry, a trace element is one whose average concentration is less than 100 parts per million (ppm) measured in the atomic count or less than 100 micrograms per gram.
In biochemistry, an essential trace element is a dietary element that is needed in very minute quantities for the proper growth, development, and physiology of the organism
.[1] The dietary elements or essential trace elements are those that are required to perform vital metabolic activities in organisms.
Examples of essential trace elements in animals include Fe (hemoglobin), Cu (respiratory pigments), Co (Vitamin B12), Mn and Zn (enzymes)
[2]. Some examples within the human body are cobalt, copper, fluorine, iodine, iron, manganese and zin
.[3] Although they are essential, they become toxic at high concentrations. Elements such as Ag, As, Cd, Cr, Hg, Ni, Pb, and Sn have no known biological function, with toxic effects even at low concentration
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