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4. A pesticide analysis was performed on blackberries from a local farm. To validate the analysis, a spike-and-recovery experiment was done. 100.0 µL of a 100.0 µg/mL solution of the pesticide atrazine was added to a 50.0 g sample of (dried) blackberry fruit. The concentration of malathion in the unspiked fruit, by a separate analysis, was found to be 25.0 ng/g, and the concentration of atrazine malathion in the spiked blackberry sample was 200.0 ng/g. What was the % recovery of this spike and recovery sample? You can assume that the 100.0 µL spike does not add significant mass to the spiked blackberry sample. a) 100% b) 112.5% c) 12.5% d) 87.5% e) None of these are correct

4. A pesticide analysis was performed on blackberries from a local farm. To validate the analysis, a spike-and-recovery experiment was done. 100.0 µL of a 100.0 µg/mL solution of the pesticide atrazine was added to a 50.0 g sample of (dried) blackberry fruit. The concentration of malathion in the unspiked fruit, by a separate analysis, was found to be 25.0 ng/g, and the concentration of atrazine malathion in the spiked blackberry sample was 200.0 ng/g. What was the % recovery of this spike and recovery sample? You can assume that the 100.0 µL spike does not add significant mass to the spiked blackberry sample. a) 100% b) 112.5% c) 12.5% d) 87.5% e) None of these are correct

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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4. A pesticide analysis was performed on blackberries from a local farm. To validate the analysis, a spike-and-recovery experiment was done. 100.0 µL of a 100.0 µg/mL solution of the pesticide atrazine was added to a 50.0 g sample of (dried) blackberry fruit. The concentration of malathion in the unspiked fruit, by a separate analysis, was found to be 25.0 ng/g, and the concentration of atrazine malathion in the spiked blackberry sample was 200.0 ng/g. What was the % recovery of this spike and recovery sample? You can assume that the 100.0 µL spike does not add significant mass to the spiked blackberry sample. a) 100% b) 112.5% c) 12.5% d) 87.5% e) None of these are correct
Transcribed Image Text:4. A pesticide analysis was performed on blackberries from a local farm. To validate the analysis, a spike-and-recovery experiment was done. 100.0 µL of a 100.0 µg/mL solution of the pesticide atrazine was added to a 50.0 g sample of (dried) blackberry fruit. The concentration of malathion in the unspiked fruit, by a separate analysis, was found to be 25.0 ng/g, and the concentration of atrazine malathion in the spiked blackberry sample was 200.0 ng/g. What was the % recovery of this spike and recovery sample? You can assume that the 100.0 µL spike does not add significant mass to the spiked blackberry sample. a) 100% b) 112.5% c) 12.5% d) 87.5% e) None of these are correct
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