Fly ash contains some heavy metal which are toxic in nature and harmful also. Among them lead is very toxic in nature and hazardous. so how can we separate lead from fly ash and is there any technique to separate all the heavy metals from flyash?
Trying to separate heavy metals from tons and tons of fly ash will most likely require thousands of liters of (very) strong acids like nitric or hydrochloric acid to bring the metals into solution being a prerequisite for separating them from the bulk of the material.
That would pose enormous (environmental) risks as well and possibly create more problems than it would solve, as all those solvents have to be disposed in a safe way as well.
This approach does not seem a wise option to me.
Please check the following links and PDF attachments.
http://www.sciencedirect.com/science/article/pii/S1878535210001334
http://www.nature.com/articles/srep17270
Trying to separate heavy metals from tons and tons of fly ash will most likely require thousands of liters of (very) strong acids like nitric or hydrochloric acid to bring the metals into solution being a prerequisite for separating them from the bulk of the material.
That would pose enormous (environmental) risks as well and possibly create more problems than it would solve, as all those solvents have to be disposed in a safe way as well.
This approach does not seem a wise option to me.
If you want to estimate using AAS, You need to wet digestion usinh HNO3 and HClO4 (1:5) following the method of AOAC . Lead in acid digest can be estimated using AAS
S Dey
thank you very much sir Sahadeb Dey,
if you have any link for this protocol then please send me as possible.
Actually i am trying to say that i want to remove the heavy metals only which are toxic without affecting the minerals present in fly ash for plant growth
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