atomic absorption spectrometer 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 uL of a 1000 ug/mL Cd standard was added to 10 mL of solution. The following data were obtained:
Absorbance of reagent black= .034
absorbance of sample= .346
absorbance of sample plus addition= .703

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

2. Later, the analyst learned that the blank was not truly a reagent blank, but water. The absorbance of the actual reagent blank, was 0.082. Calculate the cadmium concentration using the new info of the blank.

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