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Published on: June 12, 2018
An improved method to validate the relative humidity generation in sorption balances
Lars Wadsö1, Anders Anderberg, Ingrid Slund
1Building Materials, Lund University, Lund, Sweden. lars.wadso@byggtek.lth.se
Summary
This study presents a new method for validating relative humidity (RH) generation in sorption balance instruments. The improved approach offers a faster and more reliable way to determine the deliquescence point of salts.
Area of Science:
- Materials Science
- Physical Chemistry
- Analytical Chemistry
Background:
- Sorption balances are crucial for studying solid-vapor interactions and measuring sorption isotherms.
- Accurate relative humidity (RH) generation is essential for the reliable performance of sorption balance instruments.
- Current validation methods often involve slow RH ramps or steps past salt deliquescence points.
Purpose of the Study:
- To introduce an improved method for validating the relative humidity (RH) generation in sorption balance instruments.
- To demonstrate an alternative approach for determining the deliquescence relative humidity (RH) of salts.
- To offer a less time-consuming and more disturbance-resilient validation technique.
Main Methods:
- Utilizing sorption balances to weigh samples exposed to programmed relative humidity (RH).
- Implementing a stepwise constant RH approach at quasi-random RH values above and below the deliquescence RH.
- Analyzing the rates of mass change as a function of RH to determine the deliquescence point.
Main Results:
- The improved method accurately determines the deliquescence RH of salts.
- Results obtained are comparable to traditional slow ramp methods.
- The new approach exhibits reduced sensitivity to environmental disturbances.
Conclusions:
- The presented stepwise constant RH method provides a valid and improved alternative for sorption balance performance validation.
- This technique is more robust and efficient than existing methods.
- Accurate RH control is critical for reliable solid-vapor interaction studies.
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