Standard Addition Spectrophotometry (FAAS). The results obtained were as follows: A standard containing 100 mg/mL was also provided. All solutions were prepared (diluted) in 100 mL volumetric flasks.
Tube number
Calcium Standard 100 μg/mL (mL)
Calcium in the Orange flask concentration Juice (μg/mL)
Absorbance
0.000
1
0
0
0.133
2
0
4
0.358
3
1
4
0.572
4
2
4
0.810
5
3
Calculate the calcium added to each tube. On the graph paper provided, plot absorbance versus concentration of calcium and read off the concentration of calcium.