Hannah Calder
Hannah Calder is Markes International’s Environmental Air Market Development Manager, specialising in the application of thermal desorption for monitoring of organic compounds in environmental air. She is active within international standards development and sits on various working groups for air monitoring within CEN and ASTM. Email: hcalder@markes.com
Articles
Detection of ODSs and HGSs in Industrial Zones Using a Cryogen-Free Preconcentration GC–MS Method
March 29th 2024Adopted 35 years ago, the Montreal Protocol is an international treaty designed to protect the ozone layer. It addresses ozone depletion caused by industrial chemicals and remains a landmark environmental agreement in the phasing out and ban of the production and consumption of ozone-depleting substances (ODSs).
Assessing Permeation of VOCs Through Polymeric Materials
October 24th 2016The migration of chemicals through polymeric materials is difficult or impossible to model theoretically, placing an emphasis on experimental assessment to provide reliable empirical data. This article describes an investigation into the permeation of volatile chemicals through thin polymer membranes based on dynamic headspace, and how the information generated may be of value industrially - specifically in the fields of food packaging and personal protective equipment.
E-Cigarette Vapours for Regulatory Compliance and Quality Control
September 1st 2016This study describes a simple, quick approach for the sampling and analysis of nicotine, impurities, and flavour compounds in e-cigarette vapours. Combining thermal desorption (TD) with gas chromatography–mass spectrometry (GC–MS) analysis results in a versatile screening method for tackling the challenge of regulatory compliance and quality control in this rapidly expanding industry.
