The reason of more precise and accurate quantitative analytical methods based on NIR radiation than methods based on mid-IR radiation should be determined. Concept introduction: The mid-absorption region of the IR spectroscopy provides important information about the presence of functional groups in the compound. The region of near-infrared of the electromagnetic spectrum lies in the range of 770 nm to 2500 nm , and this range is used in the NIR method.

Question

Quinine in a 1.939-g tablet was to be analyzed by dissolving it with 0.10 M HCl to a final volume of exactly 500 mL. This solution was diluted by adding 50.00 mL to a 100.0 mL flask and diluting to the mark. Afterwards the fluorescence intensity was found to be 394 in arbitrary units. Under identical experimental conditions, a standard 150.0-ppm had an intensity of 184.Quinine in a 1.939-g tablet was to be analyzed by dissolving it with 0.10 M HCl to a final volume of exactly 500 mL. This solution was diluted by adding 50.00 mL to a 100.0 mL flask and diluting to the mark. Afterwards the fluorescence intensity was found to be 394 in arbitrary units. Under identical experimental conditions, a standard 150.0-ppm had an intensity of 184. Calculate the number of milligrams in the original sample.

Answer 1

Question

Chapter 17, Problem 17.6QAP

Interpretation Introduction

Interpretation:

The reason of more precise and accurate quantitative analytical methods based on NIR radiation than methods based on mid-IR radiation should be determined.

Concept introduction:

The mid-absorption region of the IR spectroscopy provides important information about the presence of functional groups in the compound. The region of near-infrared of the electromagnetic spectrum lies in the range of 770 nm to 2500 nm, and this range is used in the NIR method.

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Quinine in a 1.939-g tablet was to be analyzed by dissolving it with 0.10 M HCl to a final volume of exactly 500 mL. This solution was diluted by adding 50.00 mL to a 100.0 mL flask and diluting to the mark. Afterwards the fluorescence intensity was found to be 394 in arbitrary units. Under identical experimental conditions, a standard 150.0-ppm had an intensity of 184.Quinine in a 1.939-g tablet was to be analyzed by dissolving it with 0.10 M HCl to a final volume of exactly 500 mL. This solution was diluted by adding 50.00 mL to a 100.0 mL flask and diluting to the mark. Afterwards the fluorescence intensity was found to be 394 in arbitrary units. Under identical experimental conditions, a standard 150.0-ppm had an intensity of 184. Calculate the number of milligrams in the original sample.

How do solvent, temperature, and pH affect fluorescence of fluorophore?

A 25.0 mL aliquot was taken from a 500.0 mL sample of tonic water containing an unknown amount of quinine and diluted to a volume of 200 mL. At 347.5 nm, the fluorescence intensity of the diluted sample was measured 85.7 an arbitrary scale. Under similar conditions, a 27.5 ppm standard quinine solution had a fluorescence intensity of 185. Calculate the mass of quinine in the original tonic water sample in mg. Do not include units in your answer.