Results 71 to 80 of about 5,376 (221)

Superacid-promoted synthesis of polychlorinated dibenzofurans [PDF]

Tetrahedron Letters, 2016
Abstract Polychlorinated dibenzofurans have been prepared in one step by the condensations of o -chloranil with arenes in triflic acid. A mechanism is proposed involving formation of a monoprotonated quinone (carboxonium ion), electrophilic attack at the arene, and cyclization of a carbocation intermediate.
Ahmad Qarah, Makafui Gasonoo, Dat Do, Douglas A. Klumpp   +3 more
openaire   +1 more source

Targeted Screening and Quantification of dl-PCBs and Dioxins in Various Foodstuffs by Programmed-temperature Vaporizer Large-volume Injection Coupled to GC–MS

CHIMIA, 2014
In 2009, high concentrations of polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs) and dioxin-like polychlorinated biphenyls (dl-PCBs) were found in soils located near the municipal garbage incinerator of Geneva ...
Ngoc Huy Ho, Aurélie Bugey, Pierre Zimmerli, Joëlle Nançoz, Didier Ortelli, Patrick Edder   +5 more
doaj   +1 more source

Effects of polychlorinated biphenyls, dibenzo-p-dioxins, and dibenzofurans on fish-eating birds

, 1994
Fish-eating birds are top predators at the end of the aquatic food chain. As such, they accumulate high concentrations of halogenated polycyclic aromatics like polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), and ...
A. T. C. (Bart) Bosveld, Martin Van den Berg   +1 more
core   +1 more source

Uptake by roots and translocation to shoots of polychlorinated dibenzo-p-dioxins and dibenzofurans in typical crop plants

, 2009
Root uptake and subsequent translocation of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in 12 agricultural crops were comparatively investigated.
Chen, Jiping, Zhao, Liang, Zhang, Haijun, Ni, Yuwen, 陈吉平, Zhang, Qing   +5 more
core   +1 more source

Endocrine-Disrupting Chemicals: Some Actions of POPs on Female Reproduction

International Journal of Endocrinology, 2013
Persistent organic pollutants (POPs), such as polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs), polychlorinated biphenyls (PCBs), and polybrominated ethers (PBDEs), chloronaftalens (PCNs), and bisphenol A (BPA), are stable, lipophilic ...
Ewa L. Gregoraszczuk, Anna Ptak
doaj   +1 more source

Organic Contaminant Content and Physico-Chemical Characteristics of Waste Materials Recycled in Agriculture

Agriculture, 2015
A range of wastes representative of materials currently applied, or with future potential to be applied, to agricultural land in the UK as fertilisers and soil improvers or used as animal bedding in livestock production, were investigated. In addition to
Hannah Rigby, Alan Dowding, Alwyn Fernandes, David Humphries, Rupert G. Petch, Christopher K. Reynolds, Martin Rose, Stephen R. Smith   +7 more
doaj   +1 more source

Simple Clean-up Procedures for Determination of Polychlorinated Dibenzo-p-dioxin and Polychlorinated Dibenzofurans in Waste Oil, Soil and Biological Tissue Samples

, 1989
Simple extraction and clean-up procedures for determination of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans in complex samples such as waste oil and waste oil laden soil are described. The removal of large aliphatic constituents in
Palmer, C., Yanders, A. F., Kapila, Shubhender, Meadows, John C., Orazio, Carl E.   +4 more
core   +1 more source

Assessment of the feed additive consisting of astaxanthin (2a161j) for fish, crustaceans and ornamental fish for the renewal of its authorisation (BASF SE, DSM Nutritional Products Ltd., JYB Europe BV, NHU EUROPE GmbH)

EFSA Journal, Volume 24, Issue 4, April 2026.
Abstract Following a request from the European Commission, EFSA was asked to deliver a scientific opinion on the assessment of the application for the renewal of the authorisation of astaxanthin as a sensory additive for fish, crustaceans and ornamental fish.
EFSA Panel on Additives and Products or Substances used in Animal Feed (FEEDAP), Roberto Edoardo Villa, Giovanna Azimonti, Eleftherios Bonos, Henrik Christensen, Mojca Durjava, Birgit Dusemund, Ronette Gehring, Boet Glandorf, Maryline Kouba, Marta López‐Alonso, Francesca Marcon, Carlo Nebbia, Alena Pechová, Miguel Prieto‐Maradona, Katerina Theodoridou, Gabriele Aquilina, Maria Bastos, Paul Brantom, Jürgen Gropp, Ruud Woutersen, Jaume Galobart, Eleni Gkimprixi, Paola Manini, Piera Valeri, Alberto Navarro Villa, Maria Vittoria Vettori, Fabiola Pizzo   +27 more
wiley   +1 more source

Reference materials for the determination of contaminants in milk and milk products

Czech Journal of Food Sciences, 2003
In this review, the latest information is given about the reference materials for the determination of contaminants in milk and milk products. Certified reference materials for the determination of contaminating chemical elements, organochlorine ...
J. Táborský, A. Hejtmánková, J. Dolejšková   +2 more
doaj   +1 more source

Computer assisted peak recognition for polychlorinated dibenzo-p-dioxins (PCDD) and polychlorinated dibenzofurans (PCDF) in environmental samples

, 1996
A software has been developed for the peak recognition of 136 polychlorinated dibenzo-p-dioxins (PCDD) and polychlorinated dibenzofurans (PCDF) after high resolution gas chromatography coupled with mass spectrometry (HRGC/HRMS).
Kettrup, A, Lu, PC, Schramm, KW, Zhang, YK, Henkelmann, B, Liang, XM, Yediler, A, Wu, WZ   +7 more
core   +1 more source