PDF Archive

Easily share your PDF documents with your contacts, on the Web and Social Networks.

Share a file Manage my documents Convert Recover PDF Search Help Contact


Search


PDF Archive search engine
Last database update: 26 September at 13:46 - Around 220000 files indexed.

Show results per page

Results for «congeners»:


Total: 40 results - 0.067 seconds

J Environ Sci Health A 43, 2008, 1391-1401 100%

Increasing length of the carbon chain beyond C3 leads to a corresponding rapid increase in the number of potential isomers (C4 = 4, C5 = 8, C6 = 17, C7 = 39, and C8 = 89 congeners).

https://www.pdf-archive.com/2015/11/03/j-environ-sci-health-a-43-2008-1391-1401/

03/11/2015 www.pdf-archive.com

Environ Toxicol Chem 21, 2002, 2292-2300 98%

After exposure to the ambient water column, SPMD samples were analyzed for a suite of 36 polybrominated diphenyl ether (PBDE) congeners plus all homologue groups from mono- through hexabrominated.

https://www.pdf-archive.com/2015/11/01/environ-toxicol-chem-21-2002-2292-2300/

01/11/2015 www.pdf-archive.com

Anal Chem 74, 2002, 5263-5272 98%

Ikonomou* Contaminants Science Section, Institute of Ocean Sciences, Fisheries and Oceans Canada, 9860 West Saanich Road, Sidney, British Columbia, Canada, V8L 4B2 Sierra Rayne Department of Chemistry, Box 3065, University of Victoria, Victoria, British Columbia, Canada, V8W 3V6 The chromatographic and ionization properties of 35 polybrominated diphenyl ether (PBDE) congeners were investigated using GC/HRMS with metastable atom bombardment (MAB) and electron impact (EI) ionization.

https://www.pdf-archive.com/2015/11/01/anal-chem-74-2002-5263-5272/

01/11/2015 www.pdf-archive.com

Chemosphere 46, 2002, 649-663 97%

Box 3065, Victoria, BC, Canada V8W 3V6 Abstract Environmental levels and detailed congener profiles (31 congeners and 3 coeluting congener groups) of polybrominated diphenyl ethers (PBDEs) were assessed in a number of biota samples taken over a large geographic range covering harbours and industrial sites on Canada’s West Coast.

https://www.pdf-archive.com/2015/11/01/chemosphere-46-2002-649-663/

01/11/2015 www.pdf-archive.com

J Environ Sci Health A 45, 2010, 355-362 97%

http://www.informaworld.com/smpp/title~content=t713597268 Quantitative structure-activity relationship (QSAR) studies for predicting activation of the ryanodine receptor type 1 channel complex (RyR1) by polychlorinated biphenyl (PCB) congeners Sierra Rayne a;

https://www.pdf-archive.com/2015/11/03/j-environ-sci-health-a-45-2010-355-362/

03/11/2015 www.pdf-archive.com

Environ Sci Technol 36, 2002, 1886-1892 96%

ADDISON Contaminants Science, Institute of Ocean Sciences, Department of Fisheries and Oceans Canada, Sidney, British Columbia, Canada V8L 4B2 A suite of 37 polybrominated diphenyl ether (PBDE) congeners and all of the homologue groups from monoto deca-brominated were determined in ringed seal (Phoca hispida) blubber collected from subsistence hunts in the Canadian Arctic in 1981, 1991, 1996, and 2000.

https://www.pdf-archive.com/2015/11/01/environ-sci-technol-36-2002-1886-1892/

01/11/2015 www.pdf-archive.com

J Mol Struct THEOCHEM 869, 2008, 81-82 95%

Perfluorinated sulfonic acids Free energies Technical mixtures a b s t r a c t Gas-phase optimized geometries, enthalpies, entropies, and free energies of formation at 298 K were calculated for the 159 C3 through C8 perfluoroalkyl sulfonic acid (PFSA) congeners using the PM6 semi-empirical method.

https://www.pdf-archive.com/2015/11/03/j-mol-struct-theochem-869-2008-81-82/

03/11/2015 www.pdf-archive.com

J Chromatogr A 1016, 2003, 235-248 95%

Journal of Chromatography A, 1016 (2003) 235–248 Predicting gas chromatographic retention times for the 209 polybrominated diphenyl ether congeners Sierra Rayne a,∗ , Michael G.

https://www.pdf-archive.com/2015/11/01/j-chromatogr-a-1016-2003-235-248/

01/11/2015 www.pdf-archive.com

J Environ Sci Health A 44, 2009, 598-604 95%

http://www.informaworld.com/smpp/title~content=t713597268 Estimated bioconcentration factors (BCFs) for the C4 through C8 perfluorinated alkylsulfonic acid (PFSA) and alkylcarboxylic acid (PFCA) congeners Sierra Rayne a;

https://www.pdf-archive.com/2015/11/03/j-environ-sci-health-a-44-2009-598-604/

03/11/2015 www.pdf-archive.com

J Environ Sci Health A 44, 2009, 1374-1387 95%

17:53 5 October 2009 2 Organic carbon-normalized soil and sediment-water partitioning coefficients (Koc ) were estimated for all C1 through C8 perfluoroalkyl carboxylic (PFCA) and sulfonic (PFSA) acid congeners.

https://www.pdf-archive.com/2015/11/03/j-environ-sci-health-a-44-2009-1374-1387/

03/11/2015 www.pdf-archive.com

J Environ Sci Health A 44, 2009, 866-879 95%

Gas and aqueous phase calculations using the PM6 method predict that branched PFSA, PFCA, and PFSF congeners will have more rapid reductive defluorination kinetics than their linear counterparts.

https://www.pdf-archive.com/2015/11/03/j-environ-sci-health-a-44-2009-866-879/

03/11/2015 www.pdf-archive.com

Environ Sci Technol 38, 2004, 4293-4299 94%

Of the 37 individual PBDE congeners analyzed, only the following 13 congeners (the sum of these is ∑PBDE;

https://www.pdf-archive.com/2015/11/01/environ-sci-technol-38-2004-4293-4299/

01/11/2015 www.pdf-archive.com

J Environ Sci Health A 45, 2010, 1322-1346 93%

pKa values were then estimated for all 837 monohydroxylated mono- through nona-halogenated congeners in each of the OH-PCB, OH-PCDE, and OH-PBDE classes, as well as for the monohydroxylated polybrominated biphenyls (OH-PBBs), giving a total of 3348 compounds.

https://www.pdf-archive.com/2015/11/06/j-environ-sci-health-a-45-2010-1322-1346/

06/11/2015 www.pdf-archive.com

J Environ Sci Health A 44, 2009, 1145-1199 93%

Even less is known about the numerous branched congeners with varying perfluoroalkyl chain lengths, leading to confounding issues around attempts to constrain the properties of PFAs.

https://www.pdf-archive.com/2015/11/03/j-environ-sci-health-a-44-2009-1145-1199/

03/11/2015 www.pdf-archive.com

Science News (Ringed Seals) 91%

All nine of the congeners found in Ikonomou’s samples are known to be contained in the Penta formulation, Hardy says.

https://www.pdf-archive.com/2015/11/06/science-news-ringed-seals/

06/11/2015 www.pdf-archive.com

Environ Sci Technol 39, 2005, 1995-2003 90%

Multivariate analyses of 2,3,7,8substitued congeners and homologue group profiles suggested unique patterns in films near the WTC site compared to that observed at background sites in the study area and in other literature-derived combustion source profiles.

https://www.pdf-archive.com/2015/11/01/environ-sci-technol-39-2005-1995-2003/

01/11/2015 www.pdf-archive.com

Chemosphere 77, 2009, 1455-1456 90%

The authors compare the gas phase relative thermodynamic stabilities of these compounds using the calculated Gibbs free energies and report that the linear, 1-monotrifluoromethyl branched (1-CF3-PFOS), and 6-monotrifluoromethyl (6-CF3-PFOS) branched congeners are significantly more stable (by up to 25 kJ mol 1) than the corresponding 2-(2-CF3-PFOS), 3(3-CF3-PFOS) 4-(4-CF3-PFOS), and 5-monotrifluoromethyl (5-CF3PFOS) branched congeners.

https://www.pdf-archive.com/2015/11/03/chemosphere-77-2009-1455-1456/

03/11/2015 www.pdf-archive.com

Environ Sci Technol 37, 2003, 2847-2854 89%

IKONOMOU* Contaminants Science Section, Institute of Ocean Sciences, Fisheries and Oceans Canada, 9860 West Saanich Road, Sidney, British Columbia, Canada, V8L 4B2 BONNIE ANTCLIFFE Habitat and Enhancement Branch, Fisheries and Oceans Canada, Suite 200, 400 Burrard Street, Vancouver, British Columbia, Canada V6C 3S4 Concentrations and congener patterns of 32 individual PBDE congeners from mono- through hexa-brominated were investigated in two fish species occupying similar habitatssbut having different diets and trophic levelss and surficial sediments from several locations on the major river system of western North America, the Columbia River, in southeastern British Columbia, Canada.

https://www.pdf-archive.com/2015/11/01/environ-sci-technol-37-2003-2847-2854/

01/11/2015 www.pdf-archive.com

J Environ Sci Health A 44, 2009, 936-954 87%

Given the large number of potential PFC congeners with varying chain lengths, and our presently limited experimental database of physicochemical properties relevant for atmospheric modeling, there is a need to develop and validate reliable congener specific methods for computationally estimating the atmospheric reactivity of these compounds.

https://www.pdf-archive.com/2015/11/03/j-environ-sci-health-a-44-2009-936-954/

03/11/2015 www.pdf-archive.com

J Environ Sci Heal A 44, 2009, 317-326 87%

18:24 30 January 2009 2 Department of Chemistry, The University of Winnipeg, Winnipeg, MB, Canada Department of Chemistry, Okanagan College, Penticton, BC, Canada Acidity constants were calculated using the semiempirical PM6 pKa estimation method for all C2 through C9 perfluoroalkyl carboxylate (PFCA) congeners and the straight-chain C10 through C13 isomers.

https://www.pdf-archive.com/2015/11/03/j-environ-sci-heal-a-44-2009-317-326/

03/11/2015 www.pdf-archive.com

J Environ Sci Health A 44, 2009, 1388-1399 86%

Following validation, amidic proton pKa values were estimated for all C1 through C8 congeners of five major perfluoroalkyl sulfonamide classes:

https://www.pdf-archive.com/2015/11/03/j-environ-sci-health-a-44-2009-1388-1399/

03/11/2015 www.pdf-archive.com

Chemosphere 81, 2010, 553 81%

(2007) develop a quantitative structure–property relationship (QSPR) to estimate the Henry’s law constants (H) for the 209 polybrominated diphenyl ether (PBDE) congeners based on the data of Cetin and Odabasi (2005).

https://www.pdf-archive.com/2015/11/03/chemosphere-81-2010-553/

03/11/2015 www.pdf-archive.com

Anal Chem 75, 2003, 1049-1057 80%

Work on the toxicology of polychlorinated dibenzo-p-dioxin and dibenzofuran (PCDD/F) congeners has shown some to be several orders of magnitude more toxic than others.1,2 These studies resulted in the development of the toxic equivalence factor (TEF) concept, which rates all potential acute toxicities to that of 2,3,7,8tetrachlorodibenzo-p-dioxin (2378-TeCDD;

https://www.pdf-archive.com/2015/11/01/anal-chem-75-2003-1049-1057/

01/11/2015 www.pdf-archive.com

Environ Int 32, 2006, 575-585 79%

After a short irradiation period in acetonitrile at 302nm, the major photoproducts of BDE153 included 2,2′,4,4′,5-(BDE99), 2,2′,4,5,5′-(BDE101), and 2,4,4′,5,5′-(BDE118) substituted pentaBDEs as primary photohydrodebromination products, 2,2′,4,4′-(BDE47), 3,3′,4,4′-(BDE77), 2,3′,4,4′-(BDE66), and 2,2′,4,5′-(BDE49) substituted tetra-BDEs as secondary photohydrodebromination products, a suite of non-2,3,7,8-substituted mono- through penta-brominated dibenzofurans, and three tetrabrominated 2-hydroxybiphenyl congeners.

https://www.pdf-archive.com/2015/11/03/environ-int-32-2006-575-585/

03/11/2015 www.pdf-archive.com

Anal Chem 81, 2009, 7855 78%

The linear PFOS isomer is already expected to display preferential accumulation versus its branched counterparts in organisms.3 Furthermore, there are multiple technical mixture sources of perfluorinated sulfonic acids in the environment each with differing relative amounts of linear and branched congeners.4 In their study, Chu and Letcher have only analyzed a single source mixture, which precludes any generalizations about PFOS isomeric signatures over such large geographic regions as the composite sample set integrates.

https://www.pdf-archive.com/2015/11/03/anal-chem-81-2009-7855/

03/11/2015 www.pdf-archive.com