2024-03-28T23:10:15Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/217232020-07-09T10:16:33Zcom_10261_5062com_10261_5col_10261_5064
00925njm 22002777a 4500
dc
Eljarrat, Ethel
author
Caixach Gamisans, Josep
author
Rivera Aranda, Josep
author
2003-05
Eight sewage sludges from rural, urban and industrial wastewater treatment plants (WWTPs) in Catalonia (Spain) were analysed for polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs) and biphenyls (PCBs) to determine the present levels of contamination. A method based on an automated cleanup system followed by an isotope-dilution high-resolution mass spectrometric analysis was employed. Total toxicity equivalent (WHO-TEQ) values were calculated using the toxicity equivalent factors (WHO-TEFs) proposed by WHO for dioxin-like PCBs, PCDDs and PCDFs. The WHO-TEQPCDD/F values for these samples ranged from 4.9 to 20.8 pg/g dry weight (d.w.), with a mean value of 9.3 pg/g d.w., whereas WHO-TEQPCB levels ranged between 1.9 and 6.6 pg/g d.w., with a mean value of 4.2 pg/g d.w. The WHO-TEQPCB contribution varied from 13% to 50%, suggesting that PCB contribution on the toxicity of the samples must be taken into account. Moreover, these contemporary PCDD, PCDF and PCB concentrations were compared with previous data obtained from sewage sludge samples collected during the 80s. Our findings show that contemporary PCDD, PCDF and PCB levels have declined since the 80s.
Chemosphere 51(7): 595-601 (2003)
0045-6535
http://hdl.handle.net/10261/21723
10.1016/S0045-6535(02)00785-3
1879-1298
Dioxins
Furans
PCBs
Sewage sludge
Spain
A comparison of TEQ contributions from PCDDs, PCDFs and dioxin-like PCBs in sewage sludges from Catalonia, Spain