One Response to “The Negative Effects of Heavy Metal Pollution”

1. Abidin ZENGİNLER says:

   May 31, 2012 at 12:00 pm

   LİCEO İTALİANO I.M.I , İSTANBUL

   The İtalian High School is located in Beyoğlu, İstanbul.

   Purpose

   In this study , it was intended to determine the negative effects of heavy metal pollution, an increasing enviromental danger, during onion cultivation using lead and cadmium.

   ENTRANCE

   Elements in inorganic human body structure take parts as; structural(C,H,O,N,Ca,P) enzyme cofactors(Mn,Cu,Zn,Co,Fe,Mo,Se) and fuctional(K,S,Na,Mg,Cl,Fe,I) other elements in nature are harmful for human and many other organisms. Elements in heavy metal group such as lead(Pb), Cadmium(Cd), and Mercury(Hg) are among unintentionally exposed second grade cancerogenics.
   Among these , lead is a heavy metal which is being used since antique times , and it widely takes place in our life.It spreads out on earth and atmosphere by lead pipes painting industry , gasoline etc.Limit of the lead allowed in the air as metal and compound is 0.1 mg/m3 .It is absorbed faster in children , and affects nearly all of tissues and organ.Lead’s effects on kidney and nevre system are especially attracting attention.And cadmium also has great toxic effects , not less than the lead.While we have close contact whit cadmium through batteries , it causes symptoms such as lung problems , malfunction of sperm production in testiscles , and mental deficiency.Another harm on periodic table , it is in same group with zinc(Zn) DNA polimeraz cofactor.Both haevy metals ; lead and cadmium , can enter the food chain through water and plants , and than easliy reach animals and human beings.
   This study was started because of the intention to determine the possible lead and cadmium bildup in the eatable leaf and body parts of the onion plant , which is among our basic food.

   MATERIALS AND METHOD

   The onion which is used for the study was taken from egypt bazaar. At first we used three a piece
   Which has capacity of 1 liter.

   1) First apiece : % 0.1 fountain water + cadmium chlorine solution
   2) Second apiece :% 0,1 lead acetate + fountain water
   3) Third apiece nly fountain water

   At first we put twenty onion on the apiece as the roots of onion contact with water. As long as 3 week we observed onion s development. At the end of third week the onion was taken out and than put some sample into the tube which are found in leaves and stems. As second step we added 5 ml nitric acid on them and melted with the help of a special bake is called etüv. At the end of these process we observed Pb and Cd amounts in the tube. The results

   RESULT AND DISCUSSION

   When we observed Cd and Pb amounts with atomic absorbation we can say both of them is found higher rate in leaves part than stem

   Stem Leaves
   Control group
   (Cd/Pb) (µg/g) 0,2865/
   5,205 0,414/
   4,482
   Cd group (µg/g) 16,698 18,75
   Pb group (µg/g) 36,468 81,06

   The rate of Cadmium and lead ın onion plant

   The storage of harmful metal is high in stem with % 0,1 cadmium solution. İnsipide of this both of them storage thıs metals approximetly same levels. But with % 0,1 lead group the storage in leaves is more than two times the the storage in stems. Howewer people eat both part of onion. Thats why it is impossible to get rid of thıs metal’s danger.

   Reporters
   Sinan Hassas, Mustafa Bilgin
   Teachers
   Abidin Zenginler

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