2. A spectrophotometric method for the quantitative determination of the concentration of Pb in blood uses Cu* as an internal standard. A solution was prepared by combining 2.50mL of 7.000ppb Pb* with 1.000ml of 22.50ppb Cu the mixture was then diluted to 10.00mL. Which give an absorbance signal of 3.20 for lead and 1.35 for the copper. A 5.00mL sample of blood with unknown concentration of Pb?* is spiked with 1.000ml of 22.5ppb Cu and diluted to 10.00mL the resulting solution gave a signal of 4.95 for lead and 2.75 for copper. What is the concentration of lead in the blood sample?

2. A spectrophotometric method for the quantitative determination of the concentration of Pb in blood uses Cu* as an internal standard. A solution was prepared by combining 2.50mL of 7.000ppb Pb* with 1.000ml of 22.50ppb Cu the mixture was then diluted to 10.00mL. Which give an absorbance signal of 3.20 for lead and 1.35 for the copper. A 5.00mL sample of blood with unknown concentration of Pb?* is spiked with 1.000ml of 22.5ppb Cu and diluted to 10.00mL the resulting solution gave a signal of 4.95 for lead and 2.75 for copper. What is the concentration of lead in the blood sample?

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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Concept explainers

UV Visible Spectroscopy

Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.

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2. A spectrophotometric method for the quantitative determination of the concentration of Pb in
blood uses Cu?* as an internal standard. A solution was prepared by combining 2.50ml of 7.000ppb Pb?*
with 1.000mL of 22.50ppb Cu? the mixture was then diluted to 10.00mL. Which give an absorbance
signal of 3.20 for lead and 1.35 for the copper. A 5.00mLl sample of blood with unknown concentration
of Pb?* is spiked with 1.000ml of 22.5ppb Cu? and diluted to 10.00mL the resulting solution gave a
signal of 4.95 for lead and 2.75 for copper. What is the concentration of lead in the blood sample?

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