The lead level in a sample of contaminated soil was determined using AAS. A 2.0 g sample was dissolved in acid and then diluted to a total volume of 50.0 mL. The absorbance of this solution, determined in a spectrometer at a wavelength of 218 nm, was found to be 0.20. Several standard solutions were tested under the same conditions and a calibration curve shown below was obtained. 0.8 + 0.7 0.6 0.5 0.4 0.3 0.2 0.1 5.0 10.0 concentration of Pb (mg L-') Calculate: i. the sensitivity of method. ii. the concentration of lead in the soil in mg/kg. absorbance
The lead level in a sample of contaminated soil was determined using AAS. A 2.0 g sample was dissolved in acid and then diluted to a total volume of 50.0 mL. The absorbance of this solution, determined in a spectrometer at a wavelength of 218 nm, was found to be 0.20. Several standard solutions were tested under the same conditions and a calibration curve shown below was obtained. 0.8 + 0.7 0.6 0.5 0.4 0.3 0.2 0.1 5.0 10.0 concentration of Pb (mg L-') Calculate: i. the sensitivity of method. ii. the concentration of lead in the soil in mg/kg. absorbance
Principles of Instrumental Analysis
7th Edition
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Chapter1: Introduction
Section: Chapter Questions
Problem 1.9QAP
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solve question i & ii
Transcribed Image Text:The lead level in a sample of contaminated soil was determined using AAS. A
2.0 g sample was dissolved in acid and then diluted to a total volume of 50.0
mL. The absorbance of this solution, determined in a spectrometer at a
wavelength of 218 nm, was found to be 0.20. Several standard solutions were
tested under the same conditions and a calibration curve shown below was
obtained.
0.8 +
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0 +
5.0
10.0
concentration of Pb (mg L-1)
Calculate:
i.
the sensitivity of method.
ii.
the concentration of lead in the soil in mg/kg.
absorbance
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