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Updated: Jul 6, 2026
09:33
Determination of the Photoisomerization Quantum Yield of a Hydrazone Photoswitch
Published on: February 7, 2022
Spectrophotometric determination of hydrazine
Mary George1, K S Nagaraja, N Balasubramanian
1Department of Chemistry, Loyola Institute of Frontier Energy (LIFE), Loyola College, Chennai 600034, India.
Talanta
|March 29, 2008
Summary
A new spectrophotometric method accurately determines hydrazine by forming a stable derivative with p-dimethylaminobenzaldehyde (p-DAB). This sensitive method is applicable for analyzing hydrazine in boiler feed water.
Area of Science:
- Analytical Chemistry
- Spectrophotometry
Background:
- Hydrazine is a reactive compound requiring accurate quantification.
- Existing methods may lack sensitivity or be prone to interference.
Purpose of the Study:
- To develop a sensitive and reliable spectrophotometric method for hydrazine determination.
- To apply the method for analyzing hydrazine in industrial water samples.
Main Methods:
- Hydrazine was derivatized with 2,4-dinitrochlorobenzene to form 2,4-dinitrophenylhydrazine.
- The derivative underwent condensation with p-dimethylaminobenzaldehyde (p-DAB) to form a colored hydrazone.
- Spectrophotometric measurement of the colored product at 458 nm.
Main Results:
- The method demonstrated adherence to Beer's law for hydrazine concentrations from 0-7 µg/25 mL.
- High molar absorptivity (8.1 x 10^4 L mol⁻¹cm⁻¹) and excellent linearity (R²=0.998) were achieved.
- Low relative standard deviation (1.7% at 6 µg) indicated high precision.
Conclusions:
- The developed spectrophotometric method offers a sensitive and precise approach for hydrazine quantification.
- The method is robust, showing minimal interference from foreign ions.
- The technique is successfully applied for hydrazine determination in boiler feed water.
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