Atomic absorption spectrometry was used with the method of standard additions to

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 = 0.375 Absorbance of sample plus addition = 0.726 What was the concentration of the cadmium in the waste stream sample? Later, the analyst learned that the blank was not truly a reagent blank, but water. The absorbance of the actual reagent blank, was 0.11. Calculate the cadmium concentration using the new information of the blank. Calculate the percent error caused by using water instead of the reagent blank.

Explanation / Answer

since amount of Cd in waste addition sample = 10 microgram per ml

in given problem it is mention that 10ml solution is used so cadmium cancentration = 10*10 = 100

since absorbance =0.049

concentration =0.049*100 =4.9

later absorbance increases that is 0.11

then concentration =.11*100 =11

% error =4.9*100/11 = 44.54 %

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