In flame atomic absorption with a hydrogen/oxygen flame, the absorbance for iron
ID: 1064625 • Letter: I
Question
In flame atomic absorption with a hydrogen/oxygen flame, the absorbance for iron decreased in the presence of large concentration of sulfate ion. Which of the following is the most likely explanation for this observation?
Sulfate ion forms complexes with Fe(III) that are not readily volatilized and converted to free atoms. Thus, the concentration of iron atoms is lower in the presence of sulfate.
Sulfate ion changes the atomizer temperature and thus affects the atomization efficiency directly.
Sulfate ion alters the aspiration, nebulization, and desolvation processes of iron atoms.
Sulfate is more easily ionized than iron and thus suppresses the extent of ionization of iron.
A.Sulfate ion forms complexes with Fe(III) that are not readily volatilized and converted to free atoms. Thus, the concentration of iron atoms is lower in the presence of sulfate.
B.Sulfate ion changes the atomizer temperature and thus affects the atomization efficiency directly.
C.Sulfate ion alters the aspiration, nebulization, and desolvation processes of iron atoms.
D.Sulfate is more easily ionized than iron and thus suppresses the extent of ionization of iron.
Explanation / Answer
The correct answer is "A".
The lower absorbance for iron in presence of sulfate ions is called the chemical interference in atomic absorption spectroscopy. chemical interferenc occurs when a compound is not totalt decomposed.less amount of the element leads to the reduced amount of absorbance value for the element.
Sulfate ions form the complexes with the IRON, that are not readily volatilizes . Hence lower value of absorbance.