The Experts below are selected from a list of 150 Experts worldwide ranked by ideXlab platform
Paul D. Jones - One of the best experts on this subject based on the ideXlab platform.
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Untargeted Screening and Distribution of Organo-Bromine Compounds in Sediments of Lake Michigan
Environmental science & technology, 2015Co-Authors: Hui Peng, Chunli Chen, Jenna Cantin, David M.v. Saunders, Jianxian Sun, Song Tang, Garry Codling, Markus Hecker, Steve Wiseman, Paul D. JonesAbstract:Previously unreported natural and synthetic organo-Bromine Compounds (NSOBCs) have been found to contribute more than 99% of total organic Bromine (TOB) in environmental matrices. We recently developed a novel untargeted method (data-independent precursor isolation and characteristic fragment, DIPIC-Frag) and identified ∼2000 NSOBCs in two sediments from Lake Michigan. In this study, this method was used to investigate the distributions of these NSOBCs in 23 surficial samples and 24 segments of a sediment core from Lake Michigan. NSOBCs were detected in all 23 surficial samples and exhibited 10- to 100-fold variations in peak abundance among locations. The pattern of distributions of NSOBCs was correlated with depth of the water column (r2 = 0.61, p < 0.001). Hierarchical cluster analysis showed that sediments in close proximity exhibited similar profiles of NSOBCs. Distributions of NSOBCs in 24 segments of a sediment core dated from 1766 to 2008 were investigated, and samples from similar depths exhibite...
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untargeted identification of organo Bromine Compounds in lake sediments by ultrahigh resolution mass spectrometry with the data independent precursor isolation and characteristic fragment method
Analytical Chemistry, 2015Co-Authors: Hui Peng, Chunli Chen, David M.v. Saunders, Jianxian Sun, Song Tang, Garry Codling, Markus Hecker, Steve Wiseman, Paul D. Jones, An LiAbstract:While previous studies have found that unknown natural and synthetic organo-Bromine Compounds (NSOBCs) contributed more than 99% of the total organic Bromine (Br) in the environment, there was no efficient method for untargeted screening to identify NSOBCs in environmental matrixes. A novel untargeted method for identifying NSOBCs, based on ultrahigh-resolution mass spectrometry (UHRMS) with the Q Exactive instrument was developed. This method included a data-independent precursor isolation and characteristic fragment (DIPIC-Frag) procedure to identify NSOBCs. A total of 180 successive 5-m/z-wide windows were used to isolate precursor ions. This resulted in a sufficient dynamic range and specificity to identify peaks of Br fragment ions for analysis. A total of 2520 peaks of NSOBC Compounds containing Br were observed in sediments from Lake Michigan, United States. A new chemometric strategy which combined chromatographic profiles, isotopic peaks, precursor isolation window information, and intensities wa...
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Untargeted Identification of Organo-Bromine Compounds in Lake Sediments by Ultrahigh-Resolution Mass Spectrometry with the Data-Independent Precursor Isolation and Characteristic Fragment Method
Analytical chemistry, 2015Co-Authors: Hui Peng, Chunli Chen, David M.v. Saunders, Jianxian Sun, Song Tang, Garry Codling, Markus Hecker, Steve Wiseman, Paul D. JonesAbstract:While previous studies have found that unknown natural and synthetic organo-Bromine Compounds (NSOBCs) contributed more than 99% of the total organic Bromine (Br) in the environment, there was no efficient method for untargeted screening to identify NSOBCs in environmental matrixes. A novel untargeted method for identifying NSOBCs, based on ultrahigh-resolution mass spectrometry (UHRMS) with the Q Exactive instrument was developed. This method included a data-independent precursor isolation and characteristic fragment (DIPIC-Frag) procedure to identify NSOBCs. A total of 180 successive 5-m/z-wide windows were used to isolate precursor ions. This resulted in a sufficient dynamic range and specificity to identify peaks of Br fragment ions for analysis. A total of 2520 peaks of NSOBC Compounds containing Br were observed in sediments from Lake Michigan, United States. A new chemometric strategy which combined chromatographic profiles, isotopic peaks, precursor isolation window information, and intensities wa...
Hui Peng - One of the best experts on this subject based on the ideXlab platform.
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Multigenerational Effects and Demographic Responses of Zebrafish (Danio rerio) Exposed to Organo-Bromine Compounds
Environmental science & technology, 2018Co-Authors: Hui Peng, Yaru Jin, Xianming Zhang, Xianyi Xie, Kang Jian, Hongling Liu, Song TangAbstract:Long-term exposure to toxic chemicals often has deleterious effects on aquatic organisms. In order to support appropriate environmental management of chemicals, a mathematical model was developed to characterize the effects of chemicals on multigenerational population dynamics in aquatic animals. To parametrize the model, we conducted a multigenerational laboratory toxicity test in zebrafish (Danio rerio) exposed to 2-bromo-4,6-dinitroaniline (BDNA). Long-term exposure to BDNA considerably reduced the fecundity of adult zebrafish (F0 and F1) and caused deformities in the offspring (F2). Life history data, including changes in fecundity and population growth, were then integrated into the model to predict population dynamics of zebrafish exposed to two novel brominated flame retardants, bis(2-ethylhexyl)-2,3,4,5-tetrabromophthalate (TBPH) and 2-ethylhexyl-2,3,4,5-tetrabromobenzoate (TBB). The model predicted that the fecundity of adult zebrafish would be significantly impaired after exposure to 90.36 μM TB...
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Untargeted Screening and Distribution of Organo-Bromine Compounds in Sediments of Lake Michigan
Environmental science & technology, 2015Co-Authors: Hui Peng, Chunli Chen, Jenna Cantin, David M.v. Saunders, Jianxian Sun, Song Tang, Garry Codling, Markus Hecker, Steve Wiseman, Paul D. JonesAbstract:Previously unreported natural and synthetic organo-Bromine Compounds (NSOBCs) have been found to contribute more than 99% of total organic Bromine (TOB) in environmental matrices. We recently developed a novel untargeted method (data-independent precursor isolation and characteristic fragment, DIPIC-Frag) and identified ∼2000 NSOBCs in two sediments from Lake Michigan. In this study, this method was used to investigate the distributions of these NSOBCs in 23 surficial samples and 24 segments of a sediment core from Lake Michigan. NSOBCs were detected in all 23 surficial samples and exhibited 10- to 100-fold variations in peak abundance among locations. The pattern of distributions of NSOBCs was correlated with depth of the water column (r2 = 0.61, p < 0.001). Hierarchical cluster analysis showed that sediments in close proximity exhibited similar profiles of NSOBCs. Distributions of NSOBCs in 24 segments of a sediment core dated from 1766 to 2008 were investigated, and samples from similar depths exhibite...
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untargeted identification of organo Bromine Compounds in lake sediments by ultrahigh resolution mass spectrometry with the data independent precursor isolation and characteristic fragment method
Analytical Chemistry, 2015Co-Authors: Hui Peng, Chunli Chen, David M.v. Saunders, Jianxian Sun, Song Tang, Garry Codling, Markus Hecker, Steve Wiseman, Paul D. Jones, An LiAbstract:While previous studies have found that unknown natural and synthetic organo-Bromine Compounds (NSOBCs) contributed more than 99% of the total organic Bromine (Br) in the environment, there was no efficient method for untargeted screening to identify NSOBCs in environmental matrixes. A novel untargeted method for identifying NSOBCs, based on ultrahigh-resolution mass spectrometry (UHRMS) with the Q Exactive instrument was developed. This method included a data-independent precursor isolation and characteristic fragment (DIPIC-Frag) procedure to identify NSOBCs. A total of 180 successive 5-m/z-wide windows were used to isolate precursor ions. This resulted in a sufficient dynamic range and specificity to identify peaks of Br fragment ions for analysis. A total of 2520 peaks of NSOBC Compounds containing Br were observed in sediments from Lake Michigan, United States. A new chemometric strategy which combined chromatographic profiles, isotopic peaks, precursor isolation window information, and intensities wa...
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Untargeted Identification of Organo-Bromine Compounds in Lake Sediments by Ultrahigh-Resolution Mass Spectrometry with the Data-Independent Precursor Isolation and Characteristic Fragment Method
Analytical chemistry, 2015Co-Authors: Hui Peng, Chunli Chen, David M.v. Saunders, Jianxian Sun, Song Tang, Garry Codling, Markus Hecker, Steve Wiseman, Paul D. JonesAbstract:While previous studies have found that unknown natural and synthetic organo-Bromine Compounds (NSOBCs) contributed more than 99% of the total organic Bromine (Br) in the environment, there was no efficient method for untargeted screening to identify NSOBCs in environmental matrixes. A novel untargeted method for identifying NSOBCs, based on ultrahigh-resolution mass spectrometry (UHRMS) with the Q Exactive instrument was developed. This method included a data-independent precursor isolation and characteristic fragment (DIPIC-Frag) procedure to identify NSOBCs. A total of 180 successive 5-m/z-wide windows were used to isolate precursor ions. This resulted in a sufficient dynamic range and specificity to identify peaks of Br fragment ions for analysis. A total of 2520 peaks of NSOBC Compounds containing Br were observed in sediments from Lake Michigan, United States. A new chemometric strategy which combined chromatographic profiles, isotopic peaks, precursor isolation window information, and intensities wa...
Birgit Quack - One of the best experts on this subject based on the ideXlab platform.
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natural and anthropogenic sources of bromoform and dibromomethane in the oceanographic and biogeochemical regime of the subtropical north east atlantic
Environmental Science: Processes & Impacts, 2020Co-Authors: Melina Mehlmann, Helmke Hepach, Birgit Quack, Elliot L Atlas, Susann TegtmeierAbstract:The organic Bromine Compounds bromoform (CHBr3) and dibromomethane (CH2Br2) influence tropospheric chemistry and stratospheric ozone depletion. Their atmospheric abundance is generally related to a common marine source, which is not well characterized. A cruise between the three Macaroenesian Archipelagos of Cape Verde, the Canaries and Madeira revealed that anthropogenic sources increased oceanic CHBr3 emissions significantly close to some islands, especially at the Canaries, while heterotrophic processes in the ocean increased the flux of CH2Br2 from the sea to the atmosphere in the Cape Verde region. As anthropogenic disinfection processes, which release CHBr3 in coastal areas increase, and as more CH2Br2 may be produced from increased heterotrophy in a warming, deoxygenated ocean, both sources could supply higher fractions of stratospheric Bromine in the future, with yet unknown consequences for stratospheric ozone.
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modelling the chemistry and transport of bromoform within a sea breeze driven convective system during the shiva campaign
Atmospheric Chemistry and Physics, 2013Co-Authors: P D Hamer, N J Warwick, Virginie Marecal, Ryan Hossaini, Michel Pirre, M P Chipperfield, Azizan Abu Samah, N R P Harris, Andrew Robinson, Birgit QuackAbstract:We carry out a case study of the transport and chemistry of bromoform and its product gases (PGs) in a sea breeze driven convective episode on 19 November 2011 along the North West coast of Borneo during the "Stratospheric ozone: Halogen Impacts in a Varying Atmosphere" (SHIVA) campaign. We use ground based, ship, aircraft and balloon sonde observations made during the campaign, and a 3-D regional online transport and chemistry model capable of resolving clouds and convection explicitly that includes detailed Bromine chemistry. The model simulates the temperature, wind speed, wind direction fairly well for the most part, and adequately captures the convection location, timing, and intensity. The simulated transport of bromoform from the boundary layer up to 12 km compares well to aircraft observations to support our conclusions. The model makes several predictions regarding Bromine transport from the boundary layer to the level of convective detrainment (11 to 12 km). First, the majority of Bromine undergoes this transport as bromoform. Second, insoluble organic Bromine carbonyl species are transported to between 11 and 12 km, but only form a small proportion of the transported Bromine. Third, soluble Bromine species, which include Bromine organic peroxides, hydrobromic acid (HBr), and hypobromous acid (HOBr), are washed out efficiently within the core of the convective column. Fourth, insoluble inorganic Bromine species (principally Br2) are not washed out of the convective column, but are also not transported to the altitude of detrainment in large quantities. We expect that Br2 will make a larger relative contribution to the total vertical transport of Bromine atoms in scenarios with higher CHBr3 mixing ratios in the boundary layer, which have been observed in other regions. Finally, given the highly detailed description of the chemistry, transport and washout of Bromine Compounds within our simulations, we make a series of recommendations about the physical and chemical processes that should be represented in 3-D chemical transport models (CTMs) and chemistry climate models (CCMs), which are the primary theoretical means of estimating the contribution made by CHBr3 and other very short-lived substances (VSLS) to the stratospheric Bromine budget.
An Li - One of the best experts on this subject based on the ideXlab platform.
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untargeted identification of organo Bromine Compounds in lake sediments by ultrahigh resolution mass spectrometry with the data independent precursor isolation and characteristic fragment method
Analytical Chemistry, 2015Co-Authors: Hui Peng, Chunli Chen, David M.v. Saunders, Jianxian Sun, Song Tang, Garry Codling, Markus Hecker, Steve Wiseman, Paul D. Jones, An LiAbstract:While previous studies have found that unknown natural and synthetic organo-Bromine Compounds (NSOBCs) contributed more than 99% of the total organic Bromine (Br) in the environment, there was no efficient method for untargeted screening to identify NSOBCs in environmental matrixes. A novel untargeted method for identifying NSOBCs, based on ultrahigh-resolution mass spectrometry (UHRMS) with the Q Exactive instrument was developed. This method included a data-independent precursor isolation and characteristic fragment (DIPIC-Frag) procedure to identify NSOBCs. A total of 180 successive 5-m/z-wide windows were used to isolate precursor ions. This resulted in a sufficient dynamic range and specificity to identify peaks of Br fragment ions for analysis. A total of 2520 peaks of NSOBC Compounds containing Br were observed in sediments from Lake Michigan, United States. A new chemometric strategy which combined chromatographic profiles, isotopic peaks, precursor isolation window information, and intensities wa...
Steve Wiseman - One of the best experts on this subject based on the ideXlab platform.
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Untargeted Screening and Distribution of Organo-Bromine Compounds in Sediments of Lake Michigan
Environmental science & technology, 2015Co-Authors: Hui Peng, Chunli Chen, Jenna Cantin, David M.v. Saunders, Jianxian Sun, Song Tang, Garry Codling, Markus Hecker, Steve Wiseman, Paul D. JonesAbstract:Previously unreported natural and synthetic organo-Bromine Compounds (NSOBCs) have been found to contribute more than 99% of total organic Bromine (TOB) in environmental matrices. We recently developed a novel untargeted method (data-independent precursor isolation and characteristic fragment, DIPIC-Frag) and identified ∼2000 NSOBCs in two sediments from Lake Michigan. In this study, this method was used to investigate the distributions of these NSOBCs in 23 surficial samples and 24 segments of a sediment core from Lake Michigan. NSOBCs were detected in all 23 surficial samples and exhibited 10- to 100-fold variations in peak abundance among locations. The pattern of distributions of NSOBCs was correlated with depth of the water column (r2 = 0.61, p < 0.001). Hierarchical cluster analysis showed that sediments in close proximity exhibited similar profiles of NSOBCs. Distributions of NSOBCs in 24 segments of a sediment core dated from 1766 to 2008 were investigated, and samples from similar depths exhibite...
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untargeted identification of organo Bromine Compounds in lake sediments by ultrahigh resolution mass spectrometry with the data independent precursor isolation and characteristic fragment method
Analytical Chemistry, 2015Co-Authors: Hui Peng, Chunli Chen, David M.v. Saunders, Jianxian Sun, Song Tang, Garry Codling, Markus Hecker, Steve Wiseman, Paul D. Jones, An LiAbstract:While previous studies have found that unknown natural and synthetic organo-Bromine Compounds (NSOBCs) contributed more than 99% of the total organic Bromine (Br) in the environment, there was no efficient method for untargeted screening to identify NSOBCs in environmental matrixes. A novel untargeted method for identifying NSOBCs, based on ultrahigh-resolution mass spectrometry (UHRMS) with the Q Exactive instrument was developed. This method included a data-independent precursor isolation and characteristic fragment (DIPIC-Frag) procedure to identify NSOBCs. A total of 180 successive 5-m/z-wide windows were used to isolate precursor ions. This resulted in a sufficient dynamic range and specificity to identify peaks of Br fragment ions for analysis. A total of 2520 peaks of NSOBC Compounds containing Br were observed in sediments from Lake Michigan, United States. A new chemometric strategy which combined chromatographic profiles, isotopic peaks, precursor isolation window information, and intensities wa...
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Untargeted Identification of Organo-Bromine Compounds in Lake Sediments by Ultrahigh-Resolution Mass Spectrometry with the Data-Independent Precursor Isolation and Characteristic Fragment Method
Analytical chemistry, 2015Co-Authors: Hui Peng, Chunli Chen, David M.v. Saunders, Jianxian Sun, Song Tang, Garry Codling, Markus Hecker, Steve Wiseman, Paul D. JonesAbstract:While previous studies have found that unknown natural and synthetic organo-Bromine Compounds (NSOBCs) contributed more than 99% of the total organic Bromine (Br) in the environment, there was no efficient method for untargeted screening to identify NSOBCs in environmental matrixes. A novel untargeted method for identifying NSOBCs, based on ultrahigh-resolution mass spectrometry (UHRMS) with the Q Exactive instrument was developed. This method included a data-independent precursor isolation and characteristic fragment (DIPIC-Frag) procedure to identify NSOBCs. A total of 180 successive 5-m/z-wide windows were used to isolate precursor ions. This resulted in a sufficient dynamic range and specificity to identify peaks of Br fragment ions for analysis. A total of 2520 peaks of NSOBC Compounds containing Br were observed in sediments from Lake Michigan, United States. A new chemometric strategy which combined chromatographic profiles, isotopic peaks, precursor isolation window information, and intensities wa...
