Atomic Absorption Spectroscopy (AAS)

Objective:

1. To understand the basic operation the atomic absorption spectroscopy (AAS)

2. To determine the main factors that can affect the absorption’s ability of AAS

Results:

Part A

Table 1 Absorbance of standard solution with different concentration

Concentration of standard solution of Ca2+ (mg dm-3)	Absorbance
1.0	0.045
2.0	0.079
3.0	0.114
4.0	0.148

A graph of Ca²⁺ absorbance vs concentration of Ca²⁺ was plotted.

Part B

Table 2 Absorbance of calcium solution when different concentration of aluminium chloride solution added

Volume of AlCl3 added (cm3)	Concentration of Al3+ (g dm-3)	Absorbance of Ca2+
0.0	0.00	1.301
0.5	0.03	0.121
1.0	0.06	0.015
2.0	0.12	0.101
5.0	0.30	0.094
10.0	0.60	0.065
20.0	1.20	0.067

A graph of Ca²⁺ absorbance vs concentration of Al³⁺ was plotted (Graph 2).

Part B (II)

Table 3 Absorbance of calcium solution when different concentration of aluminium nitrate solution added

Volume of Al(NO3)3 added (cm3)	Concentration of Al3+ (g dm-3)	Absorbance of Ca2+
0.0	0.00	0.821
0.5	0.01	0.594
1.0	0.02	0.267
2.0	0.04	0.053
5.0	0.10	0.011
10.0	0.20	0.002
20.0	0.40	– 0.001

A graph of Ca²⁺ absorbance vs concentration of Al³⁺ was plotted (Graph 3).

Part B (III)

Table 4 Absorbance of calcium solution when different concentration of potassium chloride solution added with the presence of aluminium chloride

Volume of KCl added (cm3)	Concentration of KCl (mol dm-3)	Absorbance of Ca2+
0.0	0.000	0.400
0.5	0.001	0.691
1.0	0.002	0.671
2.0	0.004	0.593
5.0	0.010	0.395
10.0	0.020	0.084
15.0	0.030	0.037

A graph of Ca²⁺ absorbance vs concentration of KCl was plotted (Graph 4).

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