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A rapid air titration method for determining SO2 concentration in inhalation chambers.
American Industrial Hygiene Association Journal
|June 1, 1985
Summary
A new air titration method accurately measures sulfur dioxide (SO2) in inhalation chambers. This rapid iodate method correlates perfectly with the standard pararosaniline-formaldehyde (PRA) technique, offering a faster alternative for SO2 determination.
Area of Science:
- Environmental Chemistry
- Analytical Chemistry
- Air Quality Monitoring
Background:
- Accurate determination of sulfur dioxide (SO2) is crucial for inhalation chamber studies.
- Existing methods like the pararosaniline-formaldehyde (PRA) assay can be time-consuming.
Purpose of the Study:
- To validate a rapid air titration (iodate) method for SO2 concentration measurement in inhalation chambers.
- To compare the efficacy of the new method against the established PRA method.
Main Methods:
- Adaptation of iodometric methods using potassium iodate, potassium iodide, and starch indicator.
- Air sampling in under ten minutes with concentration calculated via a simple formula.
- Validation against the pararosaniline-formaldehyde (PRA) method across SO2 concentrations from 0.5 to 100 ppm.
Main Results:
- The air titration (iodate) method demonstrated high accuracy and speed.
- Linear equations were derived for uncorrected and corrected iodate bubbler results.
- A near-perfect linear correlation (0.999) was achieved with the PRA method for all data sets.
Conclusions:
- The validated air titration method provides a rapid and reliable alternative for SO2 determination in inhalation chambers.
- This method simplifies SO2 analysis, potentially improving efficiency in air quality studies.
- The high correlation with the PRA method ensures confidence in its application.