Atomic absorption spectrometry was used with the method of standard additions to
ID: 854404 • Letter: A
Question
Atomic absorption spectrometry 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, 10.0 MuL of a 1000.0 Mug/mL Cd standard was added to 10.0 mL of solution. The following data were obtained: Absorbance of reagent blank = 0.049 Absorbance of sample = 0.312 Absorbance of sample plus addition = 0.851 What was the concentration of the cadmium in the waste stream sample? Number Mug / mL Later, the analyst learned that the blank was not truly a reagent blank, but water. The absorbance of the actual reagent blank, was 0.12. Calculate the cadmium concentration using the new information of the blank. Number Mug / mL Calculate the percent error caused by using water instead of the reagent blank. Number %Explanation / Answer
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Atomic absorption spectrometry 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, 10microliters of a 1000 microgram/mL Cd standard was added to 10mL of solution. The following data were obtained:
Absorbance of reagent blank:=0.033
Absorbance of sample=0.597
Absorbance of sample plus addition=0.797
What was the concentration of the cadmium in the waste stream sample?
answer
1000migm/ml absorbtion of sample by addition of cadmium = 0.797
A=ecl
el =A/c = 0.797/1000
Net absorbtion of sample = 0.597-0.03= 0.594
A=ecl
c=A/el = 0.594/0.000797 = 745.29 microgm/ml is conc of Cd in waste
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