ILF Magdeburg
ILF Magdeburg
Aktuelles

Aktuelles

ILF Magdeburg
ILF Magdeburg

Quantification of oximes in construction products

Oximes (R¹R²C=N–OH) are used in construction products, in particular as cross-linking agents in neutral-curing silicone sealants and as anti-skinning additives in adhesives and solvent-based coatings. They prevent premature curing during storage and application.

2-Butanone oxime (methylethylketoxime, MEKO), which has been widely used for a long time, has been strictly regulated across the EU since March 2022. Due to its classification as carcinogenic (Category 1B) and acutely toxic (Category 3), limit values of 1000 ppm in the product and 1 µg/m³ in the workplace apply. Substitutes such as 2-pentanone oxime (MPKO) or related oximes are increasingly being used, but they also pose health risks and have not yet been studied as comprehensively.

Against this background, reliable analytical quantification of oximes in building products and their emissions is essential. As part of a funded research project, gas chromatography-mass spectrometry (GC-MS) methods were developed and validated for this purpose. The in-can analysis is based on solvent extraction, in which parameters such as extraction time, temperature and the use of ultrasound have been optimised. Using the developed method, oxime concentrations from approximately 490 ppm can be quantitatively determined and reliably detected down to approximately 150 ppm.

For the determination of oximes in air, test chamber investigations are carried out in accordance with DIN EN 16516 and DIN ISO 16000-6. Under defined climatic conditions and with optimised sampling (≥ 10 standard litres, multi-bed adsorption), oxime concentrations of around 0.85 µg/m³ can be reliably quantified; detection is possible down to the ng range.

The methods developed thus enable a reliable and practical assessment of construction products, both in terms of regulatory requirements and stricter environmental and health criteria.

We would like to thank the Federal Ministry for Economic Affairs and Energy and VDI/VDE Innovation und Technik GmbH for funding the ZIM project under grant reference EP201285.



Your contact person:

Dr. Ute Holzhausen
Tel.: +49(0)391 6090-238
E-Mail:ute.holzhausen@ilf-magdeburg.de

 

 

 

ILF Magdeburg

Quantification of oximes in construction products

Oximes (R¹R²C=N–OH) are used in construction products, in particular as cross-linking agents in neutral-curing silicone sealants and as anti-skinning additives in adhesives and solvent-based coatings. They prevent premature curing during storage and application.

2-Butanone oxime (methylethylketoxime, MEKO), which has been widely used for a long time, has been strictly regulated across the EU since March 2022. Due to its classification as carcinogenic (Category 1B) and acutely toxic (Category 3), limit values of 1000 ppm in the product and 1 µg/m³ in the workplace apply. Substitutes such as 2-pentanone oxime (MPKO) or related oximes are increasingly being used, but they also pose health risks and have not yet been studied as comprehensively.

Against this background, reliable analytical quantification of oximes in building products and their emissions is essential. As part of a funded research project, gas chromatography-mass spectrometry (GC-MS) methods were developed and validated for this purpose. The in-can analysis is based on solvent extraction, in which parameters such as extraction time, temperature and the use of ultrasound have been optimised. Using the developed method, oxime concentrations from approximately 490 ppm can be quantitatively determined and reliably detected down to approximately 150 ppm.

For the determination of oximes in air, test chamber investigations are carried out in accordance with DIN EN 16516 and DIN ISO 16000-6. Under defined climatic conditions and with optimised sampling (≥ 10 standard litres, multi-bed adsorption), oxime concentrations of around 0.85 µg/m³ can be reliably quantified; detection is possible down to the ng range.

The methods developed thus enable a reliable and practical assessment of construction products, both in terms of regulatory requirements and stricter environmental and health criteria.

We would like to thank the Federal Ministry for Economic Affairs and Energy and VDI/VDE Innovation und Technik GmbH for funding the ZIM project under grant reference EP201285.



Your contact person:

Dr. Ute Holzhausen
Tel.: +49(0)391 6090-238
E-Mail:ute.holzhausen@ilf-magdeburg.de

ILF Magdeburg