Moisture in Solids: Comparison Between Evolved Water Vapor and Vaporization Coulometric Karl Fischer Methods

Aro, Rudolf; Ayoub, Mohamed Wajdi Ben; Leito, Ivo; Georgin, Éric

doi:10.1007/s10765-020-02697-6

Cited by 6 publications

(9 citation statements)

References 13 publications

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“…To the best of our knowledge, no prior study has evaluated the water content of direct dental composites using KFT. The Karl Fischer titration (KFT) is a reliable and feasible method to determine trace amounts of water in a specimen [ 16 , 21 , 24 ]. The titration is based on adding a titer (i.e., iodine) of a known concentration to a solution with unknown water content.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, misinterpretations might occur for materials with similar water sorption values but different base water content, which is unknown when ISO 4049 standard is used. On the other hand, Karl Fischer titration (KFT) allows measuring the evaporated water from heated specimens, increasing the method’s reliability since both free and bounded water are considered [ 16 ]. In the vaporization method, the pre-weighted specimens are heated inside a sealed vial, and water vapor is transferred to the titration cell through an inert gas or dried air stream [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, Karl Fischer titration (KFT) allows measuring the evaporated water from heated specimens, increasing the method’s reliability since both free and bounded water are considered [ 16 ]. In the vaporization method, the pre-weighted specimens are heated inside a sealed vial, and water vapor is transferred to the titration cell through an inert gas or dried air stream [ 16 ]. Therefore, the present study aimed to measure the initial water content and amount of water absorbed by direct resin composites using coulometric KFT.…”

Section: Introductionmentioning

confidence: 99%

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Determination of Water Content in Direct Resin Composites Using Coulometric Karl Fischer Titration

et al. 2022

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This study evaluated the water content and sorption of direct composites over 60 days using coulometric Karl Fischer titration (KFT). Plate-shaped specimens (10 × 10 × 1 mm3 of thickness) were built up using the composites Clearfil Majesty Posterior (CM), Grandio SO (GS), and Filtek Supreme XT (FS). Water contents were determined in non-stored specimens (control) or after storage in distilled water for up to 60 days (n = 5). The amount of water transferred from the specimens heated at 200 °C (isothermal mode) was measured in the Coulometer. The water content of non-stored specimens ranged from 0.28 to 1.69 wt% (5.6 to 31.2 μg/mm3) for GS and FS, respectively. The highest values of water sorption were observed for FS (25.3 μg/mm3 after 60 days). GS and CM showed similar water sorption after 60 days (≈9 μg/mm3), but an ultimate higher water content was observed for CM (0.9 wt%; 22.0 μg/mm3) than GS (0.7 wt%; 14.8 μg/mm3). Except for CM, no significant water sorption was observed between 21 and 60 days of storage. Since all composites presented some base water content, water sorption data alone do not account for the ultimate water content in direct resin-based composites.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Determination of Water Content in Direct Resin Composites Using Coulometric Karl Fischer Titration

et al. 2022

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“…All samples were analysed in replicates and the measurement series were repeated on several days. Initial results have been published earlier [15]. In this work a more detailed study on the effects of the calculation methods was undertaken.…”

Section: Methodsmentioning

confidence: 99%

“…In chemistry, PMMs are gravimetry, titrimetry, isotope dilution mass spectrometry and coulometry [12], an example of the latter being EWV. Despite being PMMs, recent publications have demonstrated the usefulness of calibrating EWV and Karl Fischer titration (KFT), when highly accurate results are desired [13][14][15]. As PMMs, EWV and KFT are used to calibrate secondary measurement methods, to ensure traceability to SI units [10,16].…”

Section: Introductionmentioning

confidence: 99%

Calibration and Uncertainty Estimation for Water Content Measurement in Solids

et al. 2021

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In the field of water content measurement, the calibration of coulometric methods (e.g., coulometric Karl Fischer titration or evolved water vapor analysis) is often overlooked. However, as coulometric water content measurement methods are used to calibrate secondary methods, their results must be obtained with the highest degree of confidence. The utility of calibrating such instruments has been recently demonstrated. Both single and multiple point calibration methods have been suggested. This work compares these calibration methods for the evolved water vapor analysis technique. Two uncertainty estimation approaches (Kragten’s spreadsheet and M-CARE software tool) were compared as well, both based on the ISO GUM method.

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Coulometric titration of water content and uptake in CAD/CAM chairside composites

et al. 2022

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Moisture in Solids: Comparison Between Evolved Water Vapor and Vaporization Coulometric Karl Fischer Methods

Cited by 6 publications

References 13 publications

Determination of Water Content in Direct Resin Composites Using Coulometric Karl Fischer Titration

Determination of Water Content in Direct Resin Composites Using Coulometric Karl Fischer Titration

Calibration and Uncertainty Estimation for Water Content Measurement in Solids

Coulometric titration of water content and uptake in CAD/CAM chairside composites

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