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Sant Jordi Desvalls, Spain

Corcellas C.,Dep. of Environmental Chemistry | Feo M.L.,Dep. of Environmental Chemistry | Torres J.P.,Biophysics Institute | Malm O.,Biophysics Institute | And 4 more authors.
Environment International | Year: 2012

There is an assumption that pyrethroid pesticides are converted to non-toxic metabolites by hydrolysis in mammals. However, some recent works have shown their bioaccumulation in human breast milk collected in areas where pyrethroids have been widely used for agriculture or malaria control. In this work, thirteen pyrethroids have been studied in human breast milk samples coming from areas without pyrethroid use for malaria control, such as Brazil, Colombia and Spain. The concentrations of pyrethroids ranged from 1.45 to 24.2ngg-1 lw. Cypermethrin, λ-cyhalothrin, permethrin and esfenvalerate/fenvalerate were present in all the studied samples. The composition of pyrethroid mixture depended on the country of origin of the samples, bifenthrin being the most abundant in Brazilian samples, λ-cyhalothrin in Colombian and permethrin in Spanish ones. When the pyrethroid concentrations were confronted against the number of gestations, an exponential decay was observed. Moreover, a time trend study was carried out in Brazil, where additional archived pool samples were analyzed, corresponding to years when pyrethroids were applied for dengue epidemic control. In these cases, total pyrethroid levels reached up to 128ngg-1 lw, and concentrations decreased when massive use was not allowed. Finally, daily intake estimation of nursing infants was calculated in each country and compared to acceptable WHO levels. The estimated daily intakes for nursing infants were always below the acceptable daily intake levels, nevertheless in certain samples the detected concentrations were very close to the maximum acceptable levels. © 2012 Elsevier Ltd. Source

Guerra P.,Dep. of Environmental Chemistry | Eljarrat E.,Dep. of Environmental Chemistry | Barcelo D.,Dep. of Environmental Chemistry | Barcelo D.,Catalan Institute for Water Research
Journal of Hydrology | Year: 2010

In response to increasing international regulations on brominated flame retardants (BFR) formulations, alternative additive flame retardants for achieving commercial product fire safety standards are being developed and used. Some of these non-BDE (brominated diphenyl ethers) BFRs are pentabromoethylbenzene (PBEB), hexabromobenzene (hexaBBz), and decabromodiphenylethane (deBDethane). The present study investigated the occurrence of these emerging BFRs, together with 38 BDE congeners (from di- to deca-BDE) in sediments sampled from different points along Llobregat basin (Spain) in three different sampling campaigns between 2005 and 2006. Emerging BFRs were detected in all sediment samples analyzed, at concentrations ranging from 3.1 to 9.6 ng/g for PBEB, from 0.4 to 2.4 ng/g for hexaBBz and from 4.8 to 23 ng/g for deBDethane. These levels are lower than concentrations obtained for PBDEs (from nd to 82 ng/g). © 2009 Elsevier B.V. All rights reserved. Source

Baron E.,Dep. of Environmental Chemistry | Eljarrat E.,Dep. of Environmental Chemistry | Barcelo D.,Dep. of Environmental Chemistry | Barcelo D.,Catalan Institute for Water Research | Barcelo D.,King Saud University
Journal of Chromatography A | Year: 2012

A new methodology for the analysis of Dechlorane Plus and related compounds (DPMA, Dec 602, Dec 603 and Dec 604) by gas chromatography coupled to negative chemical ionization tandem mass spectrometry (GC-NCI-MS-MS) was developed for three different matrices, including environmental (sediment and sludge) and biota (fish) samples. Analytical parameters such as linearity, repeatability and reproducibility, recoveries, limits of detection and limits of quantification were evaluated, showing satisfactory values for the developed methodology. Moreover, a comparison with the analysis by GC-NCI-MS was carried out. Method limits of detection (MDLs), ranging between 0.12 and 1.26. pg/g. dw, 1.16-2.90. pg/g. dw and 2.30-21.1. pg/g. lw for sediment, sludge and fish respectively, were much better than those obtained by GC-MS, with improvement factor up to 320. The applicability of the developed methodology was demonstrated by the analysis of real samples collected in a non-producing area, the Ebro river basin (Spain). DP values were up to 1.61. ng/g. dw, 18.8. ng/g. dw and 2.24. ng/g. lw for sediment, sludge and fish samples, respectively. © 2012 Elsevier B.V. Source

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