Characterization of some real mixed plastics from weee: A focus on chlorine and bromine determination by different analytical methods

Bromine and chlorine are almost ubiquitous in waste of electrical and electronic equipment (WEEE) and the knowledge of their content in the plastic fraction is an essential step for proper end of life management. The aim of this study is to compare the following analytical methods: energy dispersive X-ray fluorescence spectroscopy (ED-XRF), ion chromatography (IC), ion-selective electrodes (ISEs), and elemental analysis for the quantitative determination of chlorine and bromine in four real samples taken from different WEEE treatment plants, identifying the best analytical technique for waste management workers. Home-made plastic standard materials with known concentrations of chlorine or bromine have been used for calibration of ED-XRF and to test the techniques before the sample analysis. Results showed that IC and ISEs, based upon dissolution of the products of the sample combustion, have not always achieved a quantitative absorption of the analytes in the basic solutions and that bromine could be underestimated since several oxidation states occur after combustion. Elemental analysis designed for chlorine determination is subjected to strong interference from bromine and required frequent regeneration and recalibration of the measurement cell. The most reliable method seemed to be the non-destructive ED-XRF. Calibration with home-made standards, having a similar plastic matrix of the samples, enabled us to carry out quantitative determinations, which have been revealed to be satisfactorily accurate and precise. In all the analyzed samples a total concentration of chlorine and/or bromine between 0.6 and 4 w/w% was detected, compromising the feasibility of a mechanical recycling and suggesting the exploration of an alternative route for managing these plastic wastes.

[1]  Burcu Binici,et al.  An efficient GC-IDMS method for determination of PBDEs and PBB in plastic materials. , 2013, Talanta.

[2]  Ǻ. Bergman,et al.  An overview of commercially used brominated flame retardants, their applications, their use patterns in different countries/regions and possible modes of release. , 2003, Environment international.

[3]  L Petarca,et al.  Comparative environmental analysis of waste brominated plastic thermal treatments. , 2009, Waste management.

[4]  J. N. Hay,et al.  The thermal degradation of PET and analogous polyesters measured by thermal analysis–Fourier transform infrared spectroscopy , 2002 .

[5]  M. Riess,et al.  Analysis of flame retarded polymers and recycling materials. , 2000, Chemosphere.

[6]  K. Kawauchi,et al.  Non-destructive Rapid Analysis of Brominated Flame Retardants in Electrical and Electronic Equipment Using Raman Spectroscopy , 2004, Analytical sciences : the international journal of the Japan Society for Analytical Chemistry.

[7]  Anastasia Zabaniotou,et al.  Thermochemical treatment of E-waste from small household appliances using highly pre-heated nitrogen-thermogravimetric investigation and pyrolysis kinetics , 2011 .

[8]  F. Wang.  Polymer additive analysis by pyrolysis-gas chromatography. II. Flame retardants. , 2000, Journal of chromatography. A.

[9]  R. Niessner,et al.  Determination of metal additives and bromine in recycled thermoplasts from electronic waste by TXRF analysis , 2000, Fresenius' journal of analytical chemistry.

[10]  Manbir S. Sodhi,et al.  Models for recycling electronics end-of-life products , 2001, OR Spectr..

[11]  M. Schluep,et al.  RoHS - regulated substances in mixed plastics from waste electrical and electronic equipment , 2012, 2012 Electronics Goes Green 2012+.

[12]  Rolf Gloor,et al.  Metals, non-metals and PCB in electrical and electronic waste--actual levels in Switzerland. , 2007, Waste management.

[13]  R. Nesbitt,et al.  Matrix corrections in trace-element analysis by X-ray fluorescence: An extension of the Compton scattering technique to long wavelengths , 1976 .

[14]  J. Solar,et al.  Possibilities and limits of pyrolysis for recycling plastic rich waste streams rejected from phones recycling plants. , 2016, Waste management.

[15]  Rolf Widmer,et al.  Global perspectives on e-waste , 2005 .

[16]  Vladimir Zitko.  Qualitative determination of 10,10'-oxybisphenoxarsine and decabromodiphenyl ether in plastics. , 1999, Chemosphere.

[17]  Alan Watson,et al.  Polybrominated diphenyl ethers listed as Stockholm Convention POPs, other brominated flame retardants and heavy metals in e-waste polymers in Nigeria , 2015, Environmental Science and Pollution Research.

[18]  Bernd Bilitewski,et al.  Determination of heavy metals and halogens in plastics from electric and electronic waste. , 2009, Waste management.

[19]  Don W. Green,et al.  Perry's Chemical Engineers' Handbook , 2007 .

[20]  A. Whitley,et al.  Handheld x-ray fluorescence: practical application as a screening tool to detect the presence of environmentally-sensitive substances in electronic equipment , 2005, Proceedings of the 2005 IEEE International Symposium on Electronics and the Environment, 2005..

[21]  D. Serrano,et al.  Analysis of Products Generated from the Thermal and Catalytic Degradation of Pure and Waste Polyolefins using Py-GC/MS , 2007 .

[22]  Robin J. Law,et al.  Brominated flame retardants in the European chemicals policy of REACH-Regulation and determination in materials. , 2009, Journal of chromatography. A.

[23]  Martin Schlummer,et al.  Analysis of flame retardant additives in polymer fractions of waste of electric and electronic equipment (WEEE) by means of HPLC-UV/MS and GPC-HPLC-UV. , 2005, Journal of chromatography. A.

[24]  F. La Marca,et al.  Thermal and catalytic pyrolysis of a mixture of plastics from small waste electrical and electronic equipment (WEEE). , 2016, Waste management.

[25]  Rudi van Eldik,et al.  Extraction of brominated flame retardants from polymeric waste material using different solvents and supercritical carbon dioxide , 2003 .

[26]  F. Claisse,et al.  Quantitative X-Ray Fluorescence Analysis: Theory and Application , 1995 .

[27]  Lorenzo Cafiero,et al.  Identification and characterization of plastics from small appliances and kinetic analysis of their thermally activated pyrolysis , 2014 .

[28]  J. Boer,et al.  Analysis of two alternative organophosphorus flame retardants in electronic and plastic consumer products: resorcinol bis-(diphenylphosphate) (PBDPP) and bisphenol A bis (diphenylphosphate) (BPA-BDPP). , 2014, Chemosphere.

[29]  Stephan Hamm,et al.  Comparison of the recyclability of flame-retarded plastics. , 2003, Environmental science & technology.

[30]  L. Cafiero,et al.  Thermal and spectroscopic (TG/DSC–FTIR) characterization of mixed plastics for materials and energy recovery under pyrolytic conditions , 2015, Journal of Thermal Analysis and Calorimetry.

[31]  T. Bhaskar,et al.  Alkaline hydrothermal treatment of brominated high impact polystyrene (HIPS-Br) for bromine and bromine-free plastic recovery. , 2006, Chemosphere.

[32]  Martin Schlummer,et al.  Characterisation of polymer fractions from waste electrical and electronic equipment (WEEE) and implications for waste management. , 2007, Chemosphere.

[33]  M. Zanetti,et al.  Thermal decomposition of fire retardant brominated epoxy resins cured with different nitrogen containing hardeners , 2007 .

[34]  Paolo Pozzi,et al.  Facile characterization of polymer fractions from waste electrical and electronic equipment (WEEE) for mechanical recycling. , 2010, Waste management.

[35]  S Hamm,et al.  Determination of polybrominated diphenyl ethers and PBDD/Fs during the recycling of high impact polystyrene containing decabromodiphenyl ether and antimony oxide. , 2001, Chemosphere.

[36]  Alexia Aldrian,et al.  Monitoring of WEEE plastics in regards to brominated flame retardants using handheld XRF. , 2015, Waste management.

[37]  Paul T. Williams,et al.  Fast Pyrolysis of Halogenated Plastics Recovered from Waste Computers , 2006 .

[38]  Paul T. Williams,et al.  Catalytic pyrolysis of waste plastic from electrical and electronic equipment , 2015 .

[39]  C. Marvin,et al.  Refinements to the diastereoisomer-specific method for the analysis of hexabromocyclododecane. , 2005, Rapid communications in mass spectrometry : RCM.

[40]  Paul T. Williams,et al.  Alkaline reforming of brominated fire-retardant plastics: fate of bromine and antimony. , 2009, Chemosphere.