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Volatile organic compounds

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https://www.readbyqxmd.com/read/28350955/long-lived-species-enhance-summertime-attribution-of-north-american-ozone-to-upwind-sources
#1
Yixin Guo, Junfeng Liu, Denise L Mauzerall, Xiaoyuan Li, Larry W Horowitz, Wei Tao, Shu Tao
Ground-level ozone, harmful to most living things, is produced from both domestic and foreign emissions of anthropogenic precursors. Previous estimates of the linkage from distant sources rely on the sensitivity approach (i.e., modeling the change of ozone concentrations that result from modifying precursor emissions) as well as tagging approach (i.e., tracking ozone produced from specific O3 precursors emitted from one region). Here, for the first time, we tag all O3 precursors (i.e., nitrogen oxides, carbon monoxide (CO), volatile organic compounds (VOCs) ) from East Asia and explicitly track their physicochemical evolution without perturbing the non-linear O3 chemistry...
March 28, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28345694/metal-organic-frameworks-for-the-removal-of-toxic-industrial-chemicals-and-chemical-warfare-agents
#2
REVIEW
N Scott Bobbitt, Matthew L Mendonca, Ashlee J Howarth, Timur Islamoglu, Joseph T Hupp, Omar K Farha, Randall Q Snurr
Owing to the vast diversity of linkers, nodes, and topologies, metal-organic frameworks can be tailored for specific tasks, such as chemical separations or catalysis. Accordingly, these materials have attracted significant interest for capture and/or detoxification of toxic industrial chemicals and chemical warfare agents. In this paper, we review recent experimental and computational work pertaining to the capture of several industrially-relevant toxic chemicals, including NH3, SO2, NO2, H2S, and some volatile organic compounds, with particular emphasis on the challenging issue of designing materials that selectively adsorb these chemicals in the presence of water...
March 27, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28342994/persistent-organic-pollutants-pops-in-the-atmosphere-of-coastal-areas-of-the-ross-sea-antarctica-indications-for-long-term-downward-trends
#3
Karla Pozo, Tania Martellini, Simonetta Corsolini, Tom Harner, Victor Estellano, Petr Kukučka, Marie D Mulder, Gerhard Lammel, Alessandra Cincinelli
Passive air samplers were used to evaluate long-term trends and spatial distribution of trace organic compounds in Antarctica. Duplicate PUF disk samplers were deployed at six automatic weather stations in the coastal area of the Ross sea (East Antarctica), between December 2010 and January 2011, during the XXVI Italian Scientific Research Expedition. Among the investigated persistent organic compounds, Hexachlorobenzene was the most abundant, with air concentrations ranging from 0.8 to 50 pg m(-3). In general, the following decreasing concentration order was found for the air samples analyzed: HCB > PeCB > PCBs > DDTs > HCHs...
February 27, 2017: Chemosphere
https://www.readbyqxmd.com/read/28340922/derivation-and-validation-of-a-panel-of-exhaled-volatile-organic-compounds-in-differentiating-irritable-bowel-syndrome-from-health
#4
Ruchit Sood, Alexander C Ford
No abstract text is available yet for this article.
December 2016: Gastroenterology
https://www.readbyqxmd.com/read/28340770/a-novel-polyaniline-polypyrrole-graphene-oxide-fiber-for-the-determination-of-volatile-organic-compounds-in-headspace-gas-of-lung-cell-lines
#5
JingHong Li, Hui Xu
Exploration of volatile organic compounds (VOCs) generated by lung cell lines is a powerful and non-invasive tool for the detection of potential volatile biomarkers of lung cancer. In this study, a simple and sensitive solid phase microextraction-gas chromatography-mass spectrometry (SPME-GC-MS) method was developed for the determination of VOCs in the headspace gas of lung cell lines. For the purpose of preconcentration, a novel polyaniline/polypyrrole/graphene oxide (PANI/PPy/GO) coating was prepared on the surface of stainless steel fiber via in-situ electrochemical deposition for the first time...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28338794/genome-wide-association-study-unravels-the-genetic-control-of-the-apple-volatilome-and-its-interplay-with-fruit-texture
#6
Brian Farneti, Mario Di Guardo, Iuliia Khomenko, Luca Cappellin, Franco Biasioli, Riccardo Velasco, Fabrizio Costa
Fruit quality represents a fundamental factor guiding consumers' preferences. Among apple quality traits, volatile organic compounds and texture features play a major role. Proton Transfer Reaction-Time of Flight-Mass Spectrometry (PTR-ToF-MS), coupled with an artificial chewing device, was used to profile the entire apple volatilome of 162 apple accessions, while the fruit texture was dissected with a TAXT-AED texture analyzer. The array of volatile compounds was classed into seven major groups and used in a genome-wide association analysis carried out with 9142 single nucleotide polymorphisms (SNPs)...
February 24, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28337118/toxicological-risk-at-workplace-and-toxicity-as-life-cycle-assessment-impact-category-substitution-of-solvents-as-an-example
#7
Thomas Schupp, Philipp Alexander Georg, Guenter Kirstein
Substitution of hazardous substances against less hazardous ones is a central requirement of the European Chemical Regulation REACH (European Regulation 1907/2006/EC). Hazardous substances emitted from products may not only affect the worker; drift off and distribution in the environment may finally result in exposure of the general population. This potential threat to health is covered by the impact category "toxicity" in Life Cycle Assessments. In this paper, we present a case of a substitution of volatile organic compounds in a reactive varnish, and compare the "old" formulation with the "new" formulation against health risk to the worker, and concerning the Life Cycle Assessment impact category "toxicity"...
2017: EXCLI journal
https://www.readbyqxmd.com/read/28336894/fabrication-of-functional-polyurethane-rare-earth-nanocomposite-membranes-by-electrospinning-and-its-vocs-absorption-capacity-from-air
#8
Jun Cong Ge, Nag Jung Choi
Volatile organic compounds (VOCs) are a source of air pollution and are harmful to both human health and the environment. In this study, we fabricated polyurethane/rare earth (PU/RE) composite nanofibrous membranes via electrospinning with the aim of removing VOCs from air. The morphological structure of PU/RE nanofibrous mats was investigated using field emission scanning electron microscopy (FE-SEM), fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD) experimental analyses. A certain amount of RE (up to 50 wt...
March 11, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336003/efficacy-of-a-titanium-dioxide-nanoparticles-based-indoor-anti-odor-product-as-assessed-by-electronic-nose-and-gaschromatography-mass-spectrometry
#9
Mara Mirasoli, Roberto Gotti, Massimo Di Fusco, Giulia Basaglia, Jessica Fiori, Aldo Roda
Indoor air pollutants and odorants may have psychological and physical impact on exposed individuals and the unpleasant room air is considered as one of the factors associated with sick building syndrome comprising general symptoms such as headache and lethargy. Approaches for improving the quality of indoor air are thus important as support for human health and well-being. Photo-oxidation catalyzed by titanium dioxide (TiO2), is one of the methods used for elimination of volatile organic compounds, which are the cause of odor nuisance in indoor and outdoor air...
March 9, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28333395/small-molecules-belowground-the-role-of-specialized-metabolites-in-the-rhizosphere
#10
Hassan Massalha, Elisa Korenblum, Dorothea Tholl, Asaph Aharoni
Soil communities are diverse taxonomically and functionally. This ecosystem experiences highly complex networks of interactions, but may also present functionally independent entities. Plant roots, a metabolically active hotspot in the soil, take an essential part in belowground interactions. While plants are known to release an extremely high portion of the fixated carbon to the soil, less is known about the composition and role of C-containing compounds in the rhizosphere, in particular those involved in chemical communication...
March 23, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28331786/a-3d-chemically-modified-graphene-hydrogel-for-fast-highly-sensitive-and-selective-gas-sensor
#11
Jin Wu, Kai Tao, Yuanyuan Guo, Zhong Li, Xiaotian Wang, Zhongzhen Luo, Shuanglong Feng, Chunlei Du, Di Chen, Jianmin Miao, Leslie K Norford
Reduced graphene oxide (RGO) has proved to be a promising candidate in high-performance gas sensing in ambient conditions. However, trace detection of different kinds of gases with simultaneously high sensitivity and selectivity is challenging. Here, a chemiresistor-type sensor based on 3D sulfonated RGO hydrogel (S-RGOH) is reported, which can detect a variety of important gases with high sensitivity, boosted selectivity, fast response, and good reversibility. The NaHSO3 functionalized RGOH displays remarkable 118...
March 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28331347/environmental-triggers-and-avoidance-in-the-management-of-asthma
#12
REVIEW
Clarisse Gautier, Denis Charpin
Identifying asthma triggers forms the basis of environmental secondary prevention. These triggers may be allergenic or nonallergenic. Allergenic triggers include indoor allergens, such as house dust mites (HDMs), molds, pets, cockroaches, and rodents, and outdoor allergens, such as pollens and molds. Clinical observations provide support for the role of HDM exposure as a trigger, although avoidance studies provide conflicting results. Molds and their metabolic products are now considered to be triggers of asthma attacks...
2017: Journal of Asthma and Allergy
https://www.readbyqxmd.com/read/28331124/evaluation-of-adsorption-characteristics-of-a-fibrous-adsorbent-containing-zwitter-ionic-functional-group-targeting-organic-acids
#13
Akira Nakazawa, Ning Tang, Yoshinori Inoue, Waka Kamichatani, Toshifumi Katoh, Mitsuru Saito, Kenji Obara, Akira Toriba, Kazuichi Hayakawa
Diallylamine-maleic acid copolymer (DAM)-nonwoven fabric (DAM-f), a fibrous adsorbent, contains DAM with zwitter-ionic functional groups and forms a hydration layer on the surface. The aim of this report was to evaluate the adsorption selectivity of DAM-f to semi-volatile organic acid (C1-C5). In the aqueous phase, formic acid dissolved in the hydration layer bound to the imino group of DAM-f due to anion exchange interaction. In the gas phase, the adsorption amounts of organic acids increased with the exposure time...
2017: Journal of UOEH
https://www.readbyqxmd.com/read/28322320/sweet-taste-in-apple-the-role-of-sorbitol-individual-sugars-organic-acids-and-volatile-compounds
#14
Eugenio Aprea, Mathilde Charles, Isabella Endrizzi, Maria Laura Corollaro, Emanuela Betta, Franco Biasioli, Flavia Gasperi
Sweetness is one of the main drivers of consumer preference, and thus is given high priority in apple breeding programmes. Due to the complexity of sweetness evaluation, soluble solid content (SSC) is commonly used as an estimation of this trait. Nevertheless, it has been demonstrated that SSC and sweet taste are poorly correlated. Though individual sugar content may vary greatly between and within apple cultivars, no previous study has tried to investigate the relationship between the amount of individual sugars, or ratios of these, and apple sweetness...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28321263/the-tree-drought-emission-monitor-tree-demon-an-innovative-system-for-assessing-biogenic-volatile-organic-compounds-emission-from-plants
#15
Marvin Lüpke, Rainer Steinbrecher, Michael Leuchner, Annette Menzel
BACKGROUND: Biogenic volatile organic compounds (BVOC) emitted by plants play an important role for ecological and physiological processes, for example as response to stressors. These emitted compounds are involved in chemical processes within the atmosphere and contribute to the formation of aerosols and ozone. Direct measurement of BVOC emissions requires a specialized sample system in order to obtain repeatable and comparable results. These systems need to be constructed carefully since BVOC measurements may be disturbed by several side effects, e...
2017: Plant Methods
https://www.readbyqxmd.com/read/28320639/exposure-to-polycyclic-aromatic-hydrocarbons-and-volatile-organic-compounds-among-recently-pregnant-rural-guatemalan-women-cooking-and-heating-with-solid-fuels
#16
John R Weinstein, Renée Asteria-Peñaloza, Anaité Diaz-Artiga, Gilberto Davila, S Katharine Hammond, Ian T Ryde, Joel N Meyer, Neal Benowitz, Lisa M Thompson
BACKGROUND: Household air pollution is a major contributor to death and disability worldwide. Over 95% of rural Guatemalan households use woodstoves for cooking or heating. Woodsmoke contains carcinogenic or fetotoxic polycyclic aromatic hydrocarbons (PAHs) and volatile organic compounds (VOCs). Increased PAHs and VOCs have been shown to increase levels of oxidative stress. OBJECTIVE: We examined PAH and VOC exposures among recently pregnant rural Guatemalan women exposed to woodsmoke and compared exposures to levels seen occupationally or among smokers...
March 10, 2017: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/28319702/volatile-organic-compounds-voc-formaldehyde-and-nitrogen-dioxide-no2-in-schools-in-johor-bahru-malaysia-associations-with-rhinitis-ocular-throat-and-dermal-symptoms-headache-and-fatigue
#17
Dan Norbäck, Jamal Hisham Hashim, Zailina Hashim, Faridah Ali
This paper studied associations between volatile organic compounds (VOC), formaldehyde, nitrogen dioxide (NO2) and carbon dioxide (CO2) in schools in Malaysia and rhinitis, ocular, nasal and dermal symptoms, headache and fatigue among students. Pupils from eight randomly selected junior high schools in Johor Bahru, Malaysia (N=462), participated (96%). VOC, formaldehyde and NO2 were measured by diffusion sampling (one week) and VOC also by pumped air sampling during class. Associations were calculated by multi-level logistic regression adjusting for personal factors, the home environment and microbial compounds in the school dust...
March 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28318240/ppm-detection-of-alcohol-vapors-via-metal-organic-framework-functionalized-surface-plasmon-resonance-sensors
#18
Wouter Vandezande, Kris P F Janssen, Filip Delport, Rob Ameloot, Dirk E De Vos, Jeroen Lammertyn, Maarten B J Roeffaers
The development of novel molecular sieves opens opportunities in the development of more sensitive analytical devices. In this paper, metal organic frameworks (MOFs), specifically ZIF-8 and ZIF-93, are grown on fiber optic based surface plasmon resonance (FO-SPR) sensors. FO-SPR has enabled sensitive sensing capabilities in biomedical settings and the addition of a MOF coating opens the way for the sensing of volatile organic compounds (VOCs) in gaseous media. FO-SPR probes were homogeneously functionalized with ZIF-8 and ZIF-93 in each case using two different precursor solutions to obtain a sequential nucleation and growth phase...
March 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28317715/evaluation-of-penicillium-expansum-for-growth-patulin-accumulation-nonvolatile-compounds-and-volatile-profile-in-kiwi-juices-of-different-cultivars
#19
Yuan Wang, Tingting Shan, Yahong Yuan, Zhiwei Zhang, Chunfeng Guo, Tianli Yue
Patulin (PAT) contamination and changes of nonvolatile and volatile compounds caused by Penicillium expansum in fresh juices of 8 kiwi cultivars were investigated. Growth and PAT production of P. expansum were greater at 25°C than at 4°C. P. expansum grew in kiwi juices under pH ranging from 2.75 to 3.27 and produced 45.10-268.88μg/mL of PAT at 25°C. Decreases occurred in malic acid and soluble protein; while consumption and production simultaneously happened for reducing sugar, total soluble solid, titratable acid, citric acid, ascorbic acid and total phenolics...
August 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28315236/detection-of-ketones-by-a-novel-technology-dipolar-proton-transfer-reaction-mass-spectrometry-dp-ptr-ms
#20
Yue Pan, Qiangling Zhang, Wenzhao Zhou, Xue Zou, Hongmei Wang, Chaoqun Huang, Chengyin Shen, Yannan Chu
Proton transfer reaction mass spectrometry (PTR-MS) has played an important role in the field of real-time monitoring of trace volatile organic compounds (VOCs) due to its advantages such as low limit of detection (LOD) and fast time response. Recently, a new technology of proton extraction reaction mass spectrometry (PER-MS) with negative ions OH(-) as the reagent ions has also been presented, which can be applied to the detection of VOCs and even inorganic compounds. In this work, we combined the functions of PTR-MS and PER-MS in one instrument, thereby developing a novel technology called dipolar proton transfer reaction mass spectrometry (DP-PTR-MS)...
March 17, 2017: Journal of the American Society for Mass Spectrometry
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