analysis | Odour and emissions
mass spectrometry [GC-MS] - are currently not suitably developed for the sensitive detection and identification of potent odorants. These are present often only in trace amounts and are difficult to detect in complex matrices such as polymer materials due to co-elution with non-odorous substances and resolution problems,” Buettner says. “Another challenge is that many odorants have very
Above: Trained sensory analytics assessors at work in evaluating the odour from plastic toys at Fraunhofer IVV
potent contaminants requires both trained sensory experts and ultra-trace analysis.” According to Fraunhofer IVV, the basis for the
development of strategies to avoid odorous contami- nants – or odorants arising from reaction by-products in polymer materials – is accurate knowledge of their molecular structures and chemical properties. “However, existing information about such substances is scarce. Standard analytical methods for material emission screening - such as gas chromatography-
low odour perception thresholds in the human nose, while these are often beneath the detection limit of GC-MS techniques. Therefore, the development of very selective and sensitive detection methods for odorants is required. We consider the sensitive odorant analysis techniques conducted by a trained human assessor, as in gas chromatography-mass spectrometry coupled with olfactometry [GC-MS-O], to be a key technique in addressing these analytical issues,” she says. According to Christoph Weidmar, a Scientist working under Buettner in Fraunhofer IVV’s Sensory Analytics department on residual solvents and odorous contami- nants in children’s products, the reduction of VOC emissions remains an important objective of EU environmental policy. “A key tool achieving this goal was
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