Question

Describe the effects that are responsible for the three different absorbance profiles in Figure 9-4 and select three additional elements you would expect to have similar profiles.

Short answer

Mg absorption initially increases with flame height, but later decreases due to the interaction of Mg ions with oxygen absorption.

Absorption of Ag rises with flame height.

The absorption of Cr reduces as the flame height increases.

Magnesium and calcium have the same absorption profile.

Gold has the same absorption profile as silver.

Vanadium has the same absorption spectrum as chromium.

Step-by-step solution

Step1. Given information

The image depicts the effect of an absorption profile of three different elements. Other factors, such as this absorption profile, must also be described.

Absorption vs. height of elements Mg, Cr and Ag is given below:-

Step2.Diagram explanation for magnesium

When Mg reaches the flame, its absorption profile first increases. Following that, Mg atomization occurs, resulting in the release of free atoms. These atoms produce magnesium ions, which combine with oxygen to form MgO, causing the condition absorption profile of Mg to diminish. As a result, magnesium absorption increases with height until atomization, at which point it begins to decrease.

Step3. Diagram explanation for silver and chromium

The absorbance of element Ag, or silver, increases with the height of the flame. Silver does not oxidize quickly, and as the atomization of silver-free atoms increases, so does the absorption of this element with the height of the flame.

This element oxidizes quickly in the presence of Cr. When Cr comes into contact with a flame, it oxidizes and forms chromium oxide, which has no absorbance. As a result, chromium absorption decreases with increasing flame height.

Step4. Three additional elements one would expect to have similar profiles.

Calcium has an absorbance profile that is similar to Mg's. This element's absorption profile initially increases with flame height until atomization. After then, it combines with oxygen, and the absorption begins to diminish as the flame height increases.

Vanadium's absorption profile is comparable to that of chromium. The absorption of this element reduces as the flame height increases. This element will oxidize as soon as it comes into contact with the flame.

Gold does not easily oxidize. It has the same absorption profile as silver. As a result, as the height of the flame increases, so will the absorption of the gold element.