Hello 
This question is the same one in conq chem
In order to measure the concentration of mercury in sea water near an industrial plant, a team of chemsits used AAS. They first calibrated their instrument by admitting some standard solutions to it and determining the absorbance for each. They then measured the absorbance level of several water samples collected from different locations near the industrial plant. For their standards they made a stock solution by dissolving 0.106g mercury [as mercury (II) nitrate] in water and making the volume to 250mL in a volumetric flask, then they quantitatively diluted (by pitette) 1mL, 2mL and 4mL of this solution to 100mL (volumetric flask). Absorbances for the standards and the samples are shown below.
Standards (ml) Absorbance
1 0.083
2 0.164
4 0.331
Samples Absorbance
A 0.32
B 0.46
C 0.21
D 0.055
take 1ml of aqueous soln as 1g.
Determine the concentration of mercury (in ppm) in each of the samples
I've calculated the mass of Hg in the soln to be 0.06551 g, where there's 0.06551g in 250mL, but from here, i'm just lost. How do I go about determing the concentration. of mercury?
btw, answers are A: 16.44ppm, B: 23.6ppm, C 10.8ppm, D 2.9ppm
This question is the same one in conq chem
In order to measure the concentration of mercury in sea water near an industrial plant, a team of chemsits used AAS. They first calibrated their instrument by admitting some standard solutions to it and determining the absorbance for each. They then measured the absorbance level of several water samples collected from different locations near the industrial plant. For their standards they made a stock solution by dissolving 0.106g mercury [as mercury (II) nitrate] in water and making the volume to 250mL in a volumetric flask, then they quantitatively diluted (by pitette) 1mL, 2mL and 4mL of this solution to 100mL (volumetric flask). Absorbances for the standards and the samples are shown below.
Standards (ml) Absorbance
1 0.083
2 0.164
4 0.331
Samples Absorbance
A 0.32
B 0.46
C 0.21
D 0.055
take 1ml of aqueous soln as 1g.
Determine the concentration of mercury (in ppm) in each of the samples
I've calculated the mass of Hg in the soln to be 0.06551 g, where there's 0.06551g in 250mL, but from here, i'm just lost. How do I go about determing the concentration. of mercury?
btw, answers are A: 16.44ppm, B: 23.6ppm, C 10.8ppm, D 2.9ppm
