QUESTION
In a standard addition method, you will prepare a series of solutions in which you add different
increments of standard solutions to fixed aliquots of an unknown sample X i.e. 10.00 mL of X.
All solutions were prepared using 50.00 mL volumetric flasks. Suppose that the analysis of
standard solutions of X gave the following results:
Solution
Concentration of Added Standard,
Absorbance
ppm
Standard 1
0.00
0.201
Standard 2
2.44
0.292
Standard 3
4.88
0.378
Standard 4
7.32
0.467
Standard 5
9.76
0.554
1. Plot the standard addition graph.
(Graph below)
2. Determine the concentration of X (in ppm) in the unknown sample.
CONCLUSION
To summarize, we may draw the conclusion from this experiment that we learned more
about the proper technique for operating a flame AAS instrument, which was necessary to
follow to prevent the experiment from failing and harming the instrument. By getting the
absorbance and the concentration of the solution that was utilised from the produced standard
solutions of 1 ppm, 2 ppm, 3 ppm, 4 ppm, and 5 ppm, we can also plot a standard calibration
curve for the determination of Ca in a sample. Finally, using the standard calibration curve
that was plotted, the concentration of Ca in the sample was measured.