OPTIMISATION OF SAMPLING PROCEDURES FOR THE IDENTIFICATION OF OCTA-BDE IN RECYCLED STYRENIC SAMPLES FROM WASTE ELECTRICAL AND ELECTRONIC EQUIPMENT (WEEE)
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
A chromatographic method has been developed for detection of octa bromo diphenyl ether (Octa-BDE) in styrenic samples from Waste from Electrical and Electronic Equipment (WEEE). The method parameters obtained in this work, such as limit of detection (LOD) and limit of quantification (LOQ), both for the chromatographic step and the total identification process, are confident enough to make this method useful as a quality control (QC) tool in the company.
These method and its parameters have been calculated to be compliant with the Directive 2002/96/EC on Waste Electrical and Electronic Equipment (WEEE) as well as with the Directive 2002/95/EC on the Restriction of use of certain Hazardous Substances in electrical and electronic equipment (RoHS). Therefore the company will be sure at the same time about the law compliance and the quality control.
On the other hand, a new sampling method for QC purposes has been designed here according to statistical procedures in order to standardize and minimize the sampling error. However, the coefficient of variation for the results was not low enough, highlighting the big variability in the BFRs concentration between the different samples. This is due to the origin's nature of the materials here analysed, as they come from a wide range of different devices. The results suggest that it would be advisable to deeply analyse the practical sampling process, as the material has been sampled from the top of the bags, without taking into consideration the homogeneity differences and the stratification inside the bags. One possible option for improving the sampling process would be a previous homogenization step. Furthermore, it could be interesting to study the best moment in the whole process to make the sampling, depending on the analysis objective. Therefore, as the base for a correct control of chemicals in their plastics is the identification and a reliable quantification, as well as a correct and improved sampling methodology, this new method is a powerful tool for their quality control system.
Place, publisher, year, edition, pages
2012. , 48 p.
brominated flame retardants (BFRs), recycling, solvent extraction, HPLC, quality control
IdentifiersURN: urn:nbn:se:kth:diva-156214OAI: oai:DiVA.org:kth-156214DiVA: diva2:765816