Transition elements
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I am doing an A2 coursework on determining the metal content of coins using chromatography. I am using dithiooxamide solution as my locating agent. So I was wondeing what concentration does this solution need to be? The solvent for the metal ions in my chromatography procedure is dilute HCl. what concentration of the acid do you sugest I should use?
130408
Ulex writes
Dithiooxamide should be 0.1% (i.e.0.1g in 100 cm3 of ethanol). You then expose the sprayed paper to ammonia fumes. A reference source which I have used in the past recommends dipping a coin briefly in 0.5 cm3 of concentrated HCl and then diluting the solution to 10 cm3 with pure water before spotting onto chromatography paper. This would make the final concentration about 0.5 mol dm-3 HCl. It goes on to suggest diluting the solution further to 50 cm3 and spotting this onto chromatography paper for comparison. It will depend on the coin used which solution works best.
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updated: 13 April 2008
