The aim of this research is a preliminary assessment of antimony concentration in plastic fractions deriving from different e-waste. We considered microwave ovens, desktop computers, laptops, mobile phones, a TV case, a PC monitor and LED lamps (63 items in total). The plastic fraction ranged from 8%-wt in computers and microwave ovens, up to 40%-wt in cell phones and 59%-wt in LED lamps. Specific polymers were identified through Near Infrared spectroscopy. The samples followed three parallel procedures: acid digestion with aqua regia; conver- sion into ashes at 600°C then acid digestion with aqua regia; leaching according to UNI10802 reference pro- cedure. Plastic components with significant amounts of antimony were the ones derived from desktop comput- ers (25–1900 mg/kg) and from microwave ovens (830 mg/kg), yet their relative amount compared to the total weight of the item was limited. Items with larger plastic fractions showed lower concentrations of antimony (1–6 mg/kg in mobile phones cases and 160–640 mg/kg in plastic components of LED lamps). Leaching tests re- vealed that the analyzed plastic fractions could be mostly admitted in non-hazardous waste landfills. The analy- sis of ashed samples highlighted the need to further improve the acidic extraction procedure.

Classification of plastic waste originated from waste electric and electronic equipment based on the concentration of antimony / Alassali, Ayah; Abis, Marco; Fiore, Silvia; Kuchta, Kerstin. - In: JOURNAL OF HAZARDOUS MATERIALS. - ISSN 0304-3894. - STAMPA. - 380:120874(2019), pp. 1-6. [10.1016/j.jhazmat.2019.120874]

Classification of plastic waste originated from waste electric and electronic equipment based on the concentration of antimony

Fiore, Silvia;
2019

Abstract

The aim of this research is a preliminary assessment of antimony concentration in plastic fractions deriving from different e-waste. We considered microwave ovens, desktop computers, laptops, mobile phones, a TV case, a PC monitor and LED lamps (63 items in total). The plastic fraction ranged from 8%-wt in computers and microwave ovens, up to 40%-wt in cell phones and 59%-wt in LED lamps. Specific polymers were identified through Near Infrared spectroscopy. The samples followed three parallel procedures: acid digestion with aqua regia; conver- sion into ashes at 600°C then acid digestion with aqua regia; leaching according to UNI10802 reference pro- cedure. Plastic components with significant amounts of antimony were the ones derived from desktop comput- ers (25–1900 mg/kg) and from microwave ovens (830 mg/kg), yet their relative amount compared to the total weight of the item was limited. Items with larger plastic fractions showed lower concentrations of antimony (1–6 mg/kg in mobile phones cases and 160–640 mg/kg in plastic components of LED lamps). Leaching tests re- vealed that the analyzed plastic fractions could be mostly admitted in non-hazardous waste landfills. The analy- sis of ashed samples highlighted the need to further improve the acidic extraction procedure.
File in questo prodotto:
File Dimensione Formato  
Accepted Manuscript Classification1-s2.0-S0304389419308271-main.pdf

Open Access dal 14/07/2021

Descrizione: accepted manuscript
Tipologia: 2. Post-print / Author's Accepted Manuscript
Licenza: Creative commons
Dimensione 535.78 kB
Formato Adobe PDF
535.78 kB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2742952
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo