Interlaboratory study of the quality of water vapor sorption data for wood from automated sorption balances

Abstract Automated sorption balances are widely used for characterizing the interaction of water vapor with hygroscopic materials. This paper is part of an interlaboratory study investigating the stability and performance of automated sorption balances. A previous paper in this study investigated the mass, temperature, and relative humidity (RH) stability of automated sorption balances by looking at the mass change of a non-hygroscopic sample over time. In this study, we examine the mass stability of wood samples held at constant RH for seven to ten days after a step change. The reason for the long hold times was to collect data to “operational equilibrium” where the change in mass is on the order of the inherent operational stability of the instrument. A total of 80 datasets were acquired from 21 laboratories covering absorption with final RH levels ranging from 10 to 95%. During these long hold times, several unusual behaviors were observed in the mass-vs-time curves. Deviations from expected sorption behavior were examined by fitting the data to an empirical sorption kinetics model and calculating the root mean square error (RMSE) between the observed and smoothed behavior. Samples that had a large RMSE relative to the median RMSE of the other datasets often had one of several types of errors: abrupt disturbances, diurnal oscillations, or long-term mass decline during an absorption step. In many cases, mass fluctuations were correlated with changes in the water reservoir temperature of the automated sorption balance. We discuss potential errors in sorption measurements on hygroscopic materials and suggest an acceptable level of RMSE for sorption data.

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Publication Details

Journal
Adsorption
Published
2025-04-01
DOI
https://doi.org/10.1007/s10450-025-00627-2
Citations
1
Primary Topic
Wood Treatment and Properties
Type
article
Field-Weighted Citation Impact
2.01

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Interlaboratory study of the quality of water vapor sorption data for wood from automated sorption balances

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Interlaboratory study of the quality of water vapor sorption data for wood from automated sorption balances

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article en
1 citations

Abstract

Abstract Automated sorption balances are widely used for characterizing the interaction of water vapor with hygroscopic materials. This paper is part of an interlaboratory study investigating the stability and performance of automated sorption balances. A previous paper in this study investigated the mass, temperature, and relative humidity (RH) stability of automated sorption balances by looking at the mass change of a non-hygroscopic sample over time. In this study, we examine the mass stability of wood samples held at constant RH for seven to ten days after a step change. The reason for the long hold times was to collect data to “operational equilibrium” where the change in mass is on the order of the inherent operational stability of the instrument. A total of 80 datasets were acquired from 21 laboratories covering absorption with final RH levels ranging from 10 to 95%. During these long hold times, several unusual behaviors were observed in the mass-vs-time curves. Deviations from expected sorption behavior were examined by fitting the data to an empirical sorption kinetics model and calculating the root mean square error (RMSE) between the observed and smoothed behavior. Samples that had a large RMSE relative to the median RMSE of the other datasets often had one of several types of errors: abrupt disturbances, diurnal oscillations, or long-term mass decline during an absorption step. In many cases, mass fluctuations were correlated with changes in the water reservoir temperature of the automated sorption balance. We discuss potential errors in sorption measurements on hygroscopic materials and suggest an acceptable level of RMSE for sorption data.

AdsorptionVol. 31(4)
University of Copenhagen (DK), Centre National de la Recherche Scientifique (FR), Baylor University (US), Bangor University (GB), Lund University (SE), Université Paris-Saclay (FR), Université de Bretagne Sud (FR), Beijing Forestry University (CN), ETH Zurich (CH), Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement (FR), CentraleSupélec (FR), Institut de Recherche Dupuy de Lôme (FR), Forest Products Laboratory (US), Royal Danish Academy – Architecture, Design, Conservation (DK), Forest Research (GB), IS Instruments (United Kingdom) (GB), Norwegian Institute of Bioeconomy Research (NO), Hiden Analytical (United Kingdom) (GB), Forest and Wood Products (Australia) (AU), Industrial Measurement Systems (United States) (US), Laboratoire d'Etude et de Recherche sur le Matériau Bois (FR), InnoRenew CoE (SI), University of Life Sciences in Poznań (PL), Swiss Federal Laboratories for Materials Science and Technology (CH), King Abdullah University of Science and Technology (SA), University of Göttingen (DE), Universidad Politécnica de Madrid (ES), Université de Lorraine (FR), Aalto University (FI), Schools of Visual Arts, The Royal Danish Academy of Fine Arts (DK)
U.S. Forest Service
Clean water and sanitation
Openalex Percentile: Top 15%
Wood Treatment and Properties
2.01
DOIOpen Access PDFOpenAlex
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