Subject: Inorganic Chemistry · Chapter: Analytical Chemistry · Topic: Analytical Chemistry – General · Exam: CSIR-NET DEC 2013 · Marks: 2 · Difficulty: Medium
In the atomic absorption spectroscopic estimation of Fe(III) using $\mathrm{O_2}$ / $\mathrm{H_2}$ flame, the absorbance decreases with the addition of:
(a)$\mathrm{CO_3^{2+}}$
(b)$\mathrm{SO_4^{2-}}$
(c)EDTA
(d)$\mathrm{Cl^-}$
Answer
Answer (as printed): B
Explanation
Chemical reactions between analyte and matrix that prevent the atomization of the analyte. One common one is that Sulfate or phosphates anions will form non-volatile salts with $\mathrm{Fe^{3+}}$, so its signal decreases. Can be treated in two ways