PRINCIPLES OF INSTRUMENTAL ANALYSIS
7th Edition
ISBN: 9789353506193
Author: Skoog
Publisher: CENGAGE L
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Chapter 10, Problem 10.2QAP
Interpretation Introduction
Interpretation:
For multi element analysis, the reason for ICP source atomic emission methods to be preferred over flame atomic absorption methods needs to be explained.
Concept introduction:
The temperatures required to excite various elements are different. The process/equipment for each element may, therefore be different and has to be selected for optimum results.
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Chapter 10 Solutions
PRINCIPLES OF INSTRUMENTAL ANALYSIS
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- Induction coupled plasma (ICP) emission spectrometry is widely used for the sensitive multi-element determinations. How does the ICP work?arrow_forwardWhy high-resolution monochromator is needed for atomic emission spectroscopy while atomic absorption spectroscopy requires a monochromator having only low-to-moderate resolving power?arrow_forwardFluorometry is more selective and more sensitive than absorption spectrometry.Tell what is meant by selectivity and sensitivity.arrow_forward
- 5arrow_forwardWhich of the following statement is incorrect? The quality of grating of the monochromator affects the resolution of two closely spaced wavelengths in a spectrum. OICP (Inductively coupled plasma) is commonly used in atomic emission spectrometry. Cuvette is generally used for atomic absorption spectrometry (AAS) as the sample cell. The measurement in fluorescence spectrometry is generally more sensitive than absorption spectrometry.arrow_forward1. State the difference between transmittance, absorbance, molar absorptivity, and fluorescence. Which one(s) is proportional to analyte concentration?arrow_forward
- Explain the principal work of atomic absorption spectroscopy? And how is it used for the determination of unknown heavy metals and other metals concentrations?arrow_forwardBriefly compare the advantages and disadvantages of Nujol mulls and KBr pellets for the analysis of solid samples by IR spectrometry.arrow_forwardFlame Atomic Absorption Spectroscopy (FAAS) method is selected due to its wide applicability for metal ion analysis in drinking water samples. Discuss how can we determine the concentration of selected heavy metals (Cu and Cr) in the unknown tap water sample.arrow_forward
- 3. Explain the main differences between flame atomic absorption spectrophotometry and UV-VIS molecular absorption spectrophotometry in terms of: (a) (b) energy levels and transitions; main instrumental features.arrow_forwardA company is producing a powder which can be reconstituted as a healthy drink for the elderly. Analysis of the powder for calcium involved using the following procedure. 4 g of powder was reconstituted to 150 ml with water. Thirty ml of 24 % TCA was added to 30 ml of this solution. The mixture was allowed to stand for 15 mins and then filtered. The filtrate was analysed for calcium using atomic absorption spectroscopy. From the standard curve it was found that the reading for the analysed sample was 24mg/litre. Calculate the concentration of calcium in the powder (mg/kg).arrow_forwardWhat percent transmittance range and what absorbance range are considered to be the optimum working ranges for spectrochemical measurements?arrow_forward
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