Chapter 20, Problem 20.17P

(a)

Interpretation Introduction

Interpretation:

Isobaric interference has to be explained.

Concept Introduction:

Any change that might have been triggered by signal fluctuation although analyte concentration is maintained the same is termed as interference. Several different interferences are observed, namely spectral, chemical, ionization, or Isobaric interference.

Spectral interference is found when the signal due to furnace or flame tends to overlap with the analyte signal. Usually, elements known for the formation of highly stable oxides give such spectral interference.

Chemical interference is observed due to sulfates or phosphates that might hinder the extent of atomization for the analyte. With higher flames, such interference can be reduced.

Alkali metals pose ionization interference that involves a reduced concentration of analyte atoms due to ionization.

(b)

Interpretation Introduction

Interpretation:

Ions that might pose isobaric interference for ${}^{40}{\text{Ar}}^{16}{\text{O}}^1{\text{H}}^{+}$, ${}^{32}{\text{S}}^{16}{\text{O}}_2^{+}$ and ${}^{23}{\text{Na}}^{35}{\text{Cl}}^{+}$ have to be identified.

Concept Introduction:

Refer to part (a).