Atomic absorption spectroscopy was used with the method of standard additions to determine the concentration of cadmium in a sample of an industrial waste stream. For the addition, 10.010.0 L of a 1000.0 g/mL Cd standard was added to 10.0 mL of the unknown solution. The results obtained are shown in the table.

	Absorbance
Reagent blank	0.042
Sample	0.330
Sample plus addition	0.745

1.What is the concentration of the cadmium in the waste stream sample?

= g/mL

2.Later, the analyst learned that the blank was not truly a reagent blank, but water. The absorbance of the actual reagent blank, is 0.11. Calculate the cadmium concentration using the new information for the blank.

= g/mL

3.Calculate the percent error caused by using water as the blank instead of the reagent blank.

error: %