Two solutions used in atomic absorption measurements with an acetylene/air flame

Question

Two solutions used in atomic absorption measurements with an acetylene/air flame contain equal concentrations of lead. For each of the conditions given below, indicate which of the two solutions will likely yield the higher absorbance value at 217.0 nm (the recommended wavelength for the atomic absorption determination of Pb). Explain your choices. The flow rate of air is greater when solution 1 is analyzed then when solution 2 is analyzed. Solution 2 was prepared using ethanol as the solvent, while solution 1 is an aqueous solution. Solution 2 contains 500 mu g/mL of KCl, solution 1 does not. Solution 1 contains some added EDTA, solution 2 does not.

Explanation / Answer

a)Solution 1 yield higher absorption.More nebulizer flow yield higher absorbsce

b) solution 2 yield higher absorbance.Ethanol easilyevoparate comparing to water and it increase the atomization and hence absorption

c)Solution 2 yield higher absorbance because KCl solution acting as ionization suppressant.

d) Solution 1yield higher absorbance because EDTA complexing the Pb2+ ion and avoid the presence of refractory compound like Pb3(PO4)2 which will not atomize easily.

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