A total of 5 mL of blood samples were treated with trichloroacetic acid to precipitate proteins. After centrifugation, the resulting solution is adjusted to pH 3 and extracted with 5 ml. of methyl isobutyl ketone containing the ammonium pyrolydine dithiocarbamate (APDC) complexing compound. The extract was then measured its absorbance using an atomic absorption spectrometer (AAS) at 7. 283.3 nm with an absorbance of 0.502. A total of 5 mL of standard Pb solution with concentrations of 0.4 and 0.6 ppm was also given the same treatment and resulted in absorbance of 0.396 and 0.599 ppm. Determine the pb concentration in the sample in ppm

A total of 5 mL of blood samples were treated with trichloroacetic acid to precipitate proteins. After centrifugation, the resulting solution is adjusted to pH 3 and extracted with 5 ml. of methyl isobutyl ketone containing the ammonium pyrolydine dithiocarbamate (APDC) complexing compound. The extract was then measured its absorbance using an atomic absorption spectrometer (AAS) at 7. 283.3 nm with an absorbance of 0.502. A total of 5 mL of standard Pb solution with concentrations of 0.4 and 0.6 ppm was also given the same treatment and resulted in absorbance of 0.396 and 0.599 ppm. Determine the pb concentration in the sample in ppm

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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3. A total of 5 mL of blood samples were treated with trichloroacetic acid to precipitate proteins. After centrifugation, the resulting solution is adjusted to pH 3 and extracted with 5 mL of methyl isobutyl ketone containing the ammonium pyrolydine dithiocarbamate (APDC) complexing compound. The extract was then measured its absorbance using an atomic absorption spectrometer (AAS) at 7.283.3 nm with an absorbance of 0.502. A total of 5 mL of standard Pb solution with concentrations of 0.4 and 0.6 ppm was also given the same treatment and resulted in absorbance of 0.396 and 0.599 ppm. Determine the pb concentration in the sample in ppm units!
Suppose that a solution has an absorbance of 0.250 at a wavelength of 450 nm. If the concentration of the solution is 22 μM, what is the value of the molar absorptivity? The data were taken with a standard 1-cm cuvette. molar absorptivity in (L cm^−1 mol^-1):
The absorbance of a 0.00105% m/v solution of tolbutamide in methanol when measured in a 1 cm path length cell was found to be 0.796 at 228 nm. Calculate the specific absorbance.
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A 0.6006-g sample of Ni/Cu condenser tubing was dissolved in acid and diluted to 100 mL in a volumetric flask. Titration of both ions in a 25.0ml aliquot of this solution required 45.81 mL of 0.052285M EDTA. Mercaptoacetic acid and NH3 were then introduced; production of the Cu complex with the former resulted in the release of an equivalent amount of EDTA, which required 22.85ml titration with 0.07238M Mg2+. Calculate the %Ni (59.693 g/mol) in the alloy.
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3. A total of 5 mL of blood samples were treated with trichloroacetic acid to precipitate proteins. After centrifugation, the resulting solution is adjusted to pH 3 and extracted with 5 mL of methyl isobutyl ketone containing the ammonium pyrolydine dithiocarbamate (APDC) complexing compound. The extract was then measured its absorbance using an atomic absorption spectrometer (AAS) at 7.283.3 nm with an absorbance of 0.502. A total of 5 mL of standard Pb solution with concentrations of 0.4 and 0.6 ppm was also given the same treatment and resulted in absorbance of 0.396 and 0.599 ppm. Determine the pb concentration in the sample in ppm units!
the total solubility of amoxicillin hydrate a weekly acid acidic drug with a PK of 7.11 in SO 00.0 1M in acquiesce buffered solution of a pH equaling 7.2 is
0.9583 g of sample was dissolved in 80 mL of xylene and extracted with three 15 mL quantities of water. The combined aqueous extracts were diluted to 50.0 mL and then shaken with 10 mL toluene. The toluene was then discarded. The absorbance of the aqueous solution when measured in a 1cm path length cell was 0.134 at 278 nm.Calculate the free chlorampenicol content of the sample in ppm, given A(1%, 1cm) = 298 at 278 nm.