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Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
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Quantifying sodium hypochlorite content in hypochlorite-based disinfectants via phase-conversion headspace technique.

Chen-Quan Ni1, Wei-Qi Xie1

  • 1School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.

Journal of Chromatography. A
|April 3, 2024
PubMed
Summary

A new phase-conversion headspace technique enables precise and accurate analysis of sodium hypochlorite. This gas chromatography method efficiently quantifies sodium hypochlorite with low detection limits.

Keywords:
Headspace techniqueHypochlorite-based disinfectantPhase-conversion reactionSodium hypochlorite

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Area of Science:

  • Analytical Chemistry
  • Environmental Science

Background:

  • Sodium hypochlorite is a widely used disinfectant and oxidizing agent.
  • Accurate quantification of sodium hypochlorite is crucial for various industrial and environmental applications.

Purpose of the Study:

  • To develop a novel and efficient method for sodium hypochlorite analysis.
  • To utilize phase-conversion headspace technique coupled with gas chromatography for CO2 detection.

Main Methods:

  • Employing a phase-conversion headspace technique for sample preparation.
  • Utilizing gas chromatography (GC) for the detection of carbon dioxide (CO2) generated from the reaction.
  • Quantifying sodium hypochlorite via the redox reaction with sodium oxalate.

Main Results:

  • The proposed method demonstrates high detecting precision and accuracy.
  • Achieved low detection limits with a limit of quantification (LOQ) of 0.24 μg/mL.
  • Recoveries of added standards ranged effectively from 98.33% to 101.27%.

Conclusions:

  • The phase-conversion headspace technique offers an efficient and automated strategy for sodium hypochlorite analysis.
  • This method provides a highly efficient approach for analyzing sodium hypochlorite and related products.
  • The technique is suitable for precise and accurate quantification in various matrices.