Answered: Deduce the analytical technique used…

Deduce the analytical technique used and calculate the concentration of wastewater analysed which demonstrated absorbance reading of 0.269 (sample 1), 0.532 (sample 2) and 0.478 (sample 3).

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

Chapter11: Atomic Mass Spectrometry

Section: Chapter Questions

Problem 11.2QAP

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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.

Question

Mary performed an experiment with industrial wastewater samples for determination of iron content. α-phenanthroline was added in order to obtain a strong coloured complex. A calibration graph was constructed as follow. Deduce the analytical technique used and calculate the concentration of wastewater analysed which demonstrated absorbance reading of 0.269 (sample 1), 0.532 (sample 2) and 0.478 (sample 3).

Fe calibration curve
1.0
0.5
y = 0.1854x - 0.0043
R? = 0.9995
0.0
1
3
4
Concentration (ppm)
Absorbance
LO

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