2024-03-28T22:57:02Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1917442020-12-12T16:58:35Zcom_10261_33com_10261_5com_10261_76col_10261_286col_10261_329
Comparative study of methodologies for the analysis of PCDDs and PDCFs in powdered full-fat milk. PCB, PCDD and PCDF levels in commercial samples from Spain
Ramos, Lourdes
Eljarrat, Ethel
Hernández, Luis M.
Rivera Austrui, Joan
González, María José
Feasibility of two different extraction methods involving solid-liquid extraction and Soxhlet extraction, previously used for the determination of lipid contents and PCB levels on powdered full-fat milk, are now examined for simultaneous PCDD/F analysis. The results of this study are consistent with those found for PCBs. The solid-liquid procedure provides the most efficient extraction of both labelled spiked and endogenous PCDD/Fs with the lowest variability. The average recoveries were 101% (R.S.D. = 6.9%) for 13C12-2,3,7,8-TCDD and 95% (R.S.D. = 11%) for 13C12-1,2,3,4,7,8-HxCDD. The R.S.D.s for endogenous 2,3,7,8-PCDD/Fs were in the 9.3-25% range. In addition, this methodology simplified the subsequent cleanup step as it allowed a semi-selective extraction of the apolar lipids from the milk. The proposed method was applied to simultaneous PCB and PCDD/F analyses in different brands of powdered full-fat milks commercially available in Spain. In all cases, very similar PCB and PCDD/F levels were found. Differences among batches from the same manufacturer were even lower. The total i-TEQ average for PCDDs and PCDFs in the 22 powdered full-fat milk samples analysed was 1.87 pg/g fat basis. This value was similar to those found in cow's milk from other European countries.
Peer Reviewed
2019-09-27T09:32:59Z
2019-09-27T09:32:59Z
1999
2019-09-27T09:33:00Z
artículo
http://purl.org/coar/resource_type/c_6501
doi: 10.1016/S0045-6535(98)00465-2
issn: 0045-6535
e-issn: 1879-1298
Chemosphere 38(11): 2577-2589 (1999)
http://hdl.handle.net/10261/191744
10.1016/S0045-6535(98)00465-2
10204239
none
Elsevier