Explanation Given Extinction coefficient of an impurity in water is The minimum detectable absorbance of spectrometer used is The path length or width of sample in most spectrometers is 1 cm . The threshold concentration of the impurity is 50 ppb . The minimum concentration that can be detected by the spectrometer is calculated by the formula, C = A ε l Where, C is the minimum concentration detectable. A is the minimum detectable absorbance of spectrometer. ε is extinction coefficient of the given impurity in water. l is the path length of the sample. Substitute the values of A , ε and l in the above formula. C = 0.0001 ( 3.45 × 10 3 M − 1 cm − 1 ) × 1 cm = 2

Chemistry: The Central Science, Books a la Carte Edition & Modified Mastering Chemistry with Pearson eText -- ValuePack Access Card Package

1st Edition

ISBN: 9780133910919

Author: Theodore E. Brown, H. Eugene LeMay, Bruce E. Bursten, Catherine Murphy, Patrick Woodward, Matthew E. Stoltzfus

Publisher: PEARSON

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Spectroanalytical Methods

Spectroanalytical methods measure the wavelength and intensity of radiations that are either emitted or absorbed by a molecular or atomic species. These methods are useful for evaluating the electronic or atomic arrangement of the molecules of a given an…

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Chapter 4, Problem 42E

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To determine: If measuring the absorbance of a water sample at 280 nm is a good way to detect the concentration of given impurity above the 50 ppb threshold.

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Chapter 4, Problem 41E

Chapter 4, Problem 43E

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