Color change and emission of volatile organic compounds from Scots pine exposed to heat and vacuum-heat treatment

2019 ◽  
Vol 26 ◽  
pp. 100918 ◽  
Author(s):  
Hüseyin Sivrikaya ◽  
Daniela Tesařová ◽  
Eva Jeřábková ◽  
Ahmet Can
Keyword(s):  
Heat Treatment ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Scots Pine ◽  
Color Change ◽  
Vacuum Heat Treatment ◽  
Volatile Organic

Variable emissions of microbial volatile organic compounds (MVOCs) from root-associated fungi isolated from Scots pine

2010 ◽  
Vol 44 (30) ◽  
pp. 3651-3659 ◽  
Author(s):  
Jaana Bäck ◽  
Hermanni Aaltonen ◽  
Heidi Hellén ◽  
Maija K. Kajos ◽  
Johanna Patokoski ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Scots Pine ◽  
Volatile Organic ◽  
Microbial Volatile Organic Compounds

scholarly journals Stability and Selective Vapor Sensing of Structurally Colored Lepidopteran Wings Under Humid Conditions

Sensors ◽  
2020 ◽  
Vol 20 (11) ◽  
pp. 3258
Author(s):  
Gábor Piszter ◽  
Krisztián Kertész ◽  
Zsolt Bálint ◽  
László Péter Biró
Keyword(s):  
Water Vapor ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Color Change ◽  
Response Times ◽  
Principal Component ◽  
Time Dependent ◽  
Dependent Manner ◽  
Vapor Sensing ◽  
Volatile Organic

Biological photonic nanoarchitectures are capable of rapidly and chemically selectively sensing volatile organic compounds due to changing color when exposed to such vapors. Here, stability and the vapor sensing properties of butterfly and moth wings were investigated by optical spectroscopy in the presence of water vapor. It was shown that repeated 30 s vapor exposures over 50 min did not change the resulting optical response signal in a time-dependent manner, and after 5-min exposures the sensor preserved its initial properties. Time-dependent response signals were shown to be species-specific, and by using five test substances they were also shown to be substance-specific. The latter was also evaluated using principal component analysis, which showed that the time-dependent optical responses can be used for real-time analysis of the vapors. It was demonstrated that the capability to detect volatile organic compounds was preserved in the presence of water vapor: high-intensity color change signals with short response times were measured in 25% relative humidity, similar to the one-component case; therefore, our results can contribute to the development of biological photonic nanoarchitecture-based vapor detectors for real-world applications, like living and working environments.

scholarly journals Synthesis of polyurethanes with low volatile organic compounds content for upholstery and automotive articles

2020 ◽  
Author(s):  
Anna Bacardit ◽  
Silvia Sorolla ◽  
Concepcio Casas ◽  
Lluis Olle ◽  
Mireia Conde
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
High Performance ◽  
Color Change ◽  
Research Work ◽  
Pilot Scale ◽  
Long Term Effects ◽  
Minimal Impact ◽  
Volatile Organic ◽  
Pilot Scale Reactor

The manufacture of upholstery and automotive articles is linked to the release of Volatile Organic Compounds (hereinafter VOCs) during their manufacture, which have short and long-term effects on the health of users and the environment. In the leather sector, around 40 kg of VOCs are generated per 1000 kg of raw skin. This research work has focused on the synthesis of new and more sustainable urethane-based polymers that, in turn, allow the quality requirements of the finish to be met, which vary depending on the leather article manufactured. The main objective of the study is to minimize the content of VOCs in the different aliphatic polyurethanes synthesized in a pilot-scale reactor, making small modifications to the synthesis formulations. The synthesis route developed is based on the preparation of polymers of ionomeric polyurethanes and their subsequent dispersion in water. In the synthesis processes developed, the content of coalescing solvents and neutralizing agents, which directly contribute to the concentration of VOCs of the urethane polymers, is eliminated and / or minimized as much as possible. The new urethane-based polymers obtained have been analyzed according to the parameters of pH, viscosity, density and percentage of solids in the resin. Likewise, organoleptic tests (color, transparency, hardness, touch and tacking) and physical tests (tensile strength, water absorption, hardness and color change at 100°C for 24 hours) have been carried out on the film corresponding to each synthesized polyurethane resin. These products will be introduced in finishing formulations designed to obtain high-performance upholstery and automotive leather with minimal impact in terms of VOC content at the pilot level. Tests of fastness and physical resistance have been carried out to evaluate the performance of these leathers.

scholarly journals Emission of Volatile Organic Compounds from Heartwood and Sapwood of Selected Coniferous Species

Forests ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 92 ◽  
Author(s):  
Magdalena Czajka ◽  
Beata Fabisiak ◽  
Ewa Fabisiak
Keyword(s):  
Volatile Organic Compounds ◽  
Norway Spruce ◽  
Organic Compounds ◽  
Scots Pine ◽  
Composition Analysis ◽  
European Larch ◽  
Voc Emission ◽  
Percentage Contribution ◽  
Qualitative And Quantitative ◽  
Volatile Organic

The qualitative and quantitative composition of volatile organic compounds (VOC) emitted from furnishings from solid wood and all kinds of wood derivative materials depends on many factors, of which the most important is the wood species. The intraspecies and interspecies differences in VOC emission result from the differences in the chemical composition and anatomical structure of heartwood and sapwood of different species. VOC composition analysis was performed separately for heartwood and sapwood of Scots pine (Pinus sylvestris L.), Norway spruce (Picea abies (L.) Karst.) and European larch (Larix decidua Mill.) trees. The studies were conducted in a glass climatic chamber of 0.025 m3, equipped with a system for the monitoring and control of climatic conditions. Samples of air for analyses were collected after 3, 7, 14 and 28 days of exposure. The results provided evidence for interspecies and intraspecies differences in the qualitative and quantitative compositions of VOC. The concentration of total VOC (TVOC) released from heartwood of Scots pine was higher than that released from sapwood. For European larch and Norway spruce, the opposite relations were observed. The VOC emission from Scots pine heartwood was about 17 times higher than the emission from European larch and Norway spruce heartwood. The differences in TVOC emitted from the sapwood of samples from different species were smaller. For each of the species, the highest percentage contribution to TVOC was made by terpenes. The second highest percentage contribution in TVOC was made by compounds containing a carbonyl group, mainly aldehydes, while aromatic compounds made the third highest contribution.

Studies on ectomycorrhizae of pine. I. Production of volatile organic compounds

1971 ◽  
Vol 49 (8) ◽  
pp. 1425-1431 ◽  
Author(s):  
Sagar Krupa ◽  
Nils Fries
Keyword(s):  
Volatile Organic Compounds ◽  
Volatile Compounds ◽  
Organic Compounds ◽  
Scots Pine ◽  
Pure Culture ◽  
Mycorrhizal Fungus ◽  
Root Systems ◽  
Isobutyric Acid ◽  
Mycorrhizal Root ◽  
Volatile Organic

The mycorrhizal fungus Boletus variegatus Fr. was grown in pure culture and its production of volatile organic compounds studied. Maximal production of volatile organic compounds was associated with actively growing mycelia. The major volatile compounds identified in the culture filtrate were ethanol, isobutanol, isoamyl alcohol, acetoin, and isobutyric acid. Of these, isobutanol and isobutyric acid are known to possess fungistatic activity. Volatile organic compounds were also extracted from the whole root systems of Pinus sylvestris L. (Scots pine) seedlings grown in pure culture with and without the fungal symbiont. Infection of the roots by the fungus resulted in production and (or) accumulation of volatile compounds in concentrations two to eight times greater than that of non-inoculated controls. These compounds were identified by combined gas chromatography and mass spectrometry. They were primarily terpenes and sesquiterpenes. Volatile compounds produced by the mycorrhizal root system of Scots pine collected from a nursery were essentially the same as those obtained from the plants grown in pure culture. Many of these are known to be fungistatic compounds. A hypothesis has been proposed to explain a possible role of the host plant in disease resistance of mycorrhizal root systems to root pathogens and in the development of the symbiotic state.

scholarly journals Released Volatile Organic Compounds in Southern Yellow Pine before and after Heat Treatment

2018 ◽  
Vol 15 (11) ◽  
pp. 2579 ◽  
Author(s):  
Chen Wang ◽  
Zhiping Wang ◽  
Ye Qin ◽  
Xiaoqian Yin ◽  
Anmin Huang
Keyword(s):  
Heat Treatment ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Solid Phase ◽  
Gas Chromatography Mass Spectrometry ◽  
Volatile Organic ◽  
Before And After ◽  
Yellow Pine ◽  
Pinus Spp ◽  
Southern Yellow Pine

As the main material in indoor furniture, southern yellow pine (Pinus spp.) releases volatile organic compounds (VOCs) into the environment during use. To better understand variations in the contents of VOCs in southern yellow pine before and after heat treatment, this study conducts dry heat treatment on southern yellow pine at 140 °C and 220 °C. Headspace solid phase micro-extraction was used to extract VOCs from southern yellow pine. The VOCs of southern yellow pine before and after heat treatment were identified via gas chromatography-mass spectrometry, and chemical component differences were characterized via Fourier transform infrared spectroscopy. Results reveal 86 VOCs in pure southern yellow pine, including alcohols, aromatics, acids, aldehydes, alkanes, alkenes, and some trace compounds (e.g., furans, ketones, phenols, and esters). With an increase in heat-treatment temperature, the contents of alkanes increased, whereas those of alcohols and alkenes decreased. The contents of aromatics, acids, and aldehydes were highest when heat treated at 140 °C. At 220 °C, the total contents of key VOCs in southern yellow pine were lowest.

scholarly journals AIR POLLUTION WITH VOLATILE ORGANIC COMPOUNDS FROM HEAT TREATMENT OF METALS

2021 ◽  
Author(s):  
Valeriu Danciulescu ◽  
◽  
Elena Bucur ◽  
Ileana Crina Nicolescu ◽  
Gheorghita Tanase ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Air Pollution ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Volatile Organic

Data Collecting and Identifying Based on Metalloporphyrin and Zinc Phthalocyanine Sensor Array

2014 ◽  
Vol 1081 ◽  
pp. 98-102
Author(s):  
Jiao Jiao Wei ◽  
Shuang Xia ◽  
Yong Long Qiu ◽  
Jian Hua Xu ◽  
Wen Yao Yang ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Room Temperature ◽  
Sensor Array ◽  
Color Change ◽  
The Other ◽  
Zinc Phthalocyanine ◽  
Processing Technologies ◽  
Volatile Organic ◽  
Sensor Detection

Smell-Seeing Sensor Array consists of two parts. One concerns a sensitive arrays, and the other deals with image collecting and processing technologies. In this paper, a 2×2 sensor array is made by the metalloporphyrin (CuTPP、ZnTPP、NiTPP) and zinc phthalocyanine (ZnPC). Exposed in vapor of 14 different kinds of VOCs (Volatile Organic Compounds) at room temperature, the array appears color change. ARM-Linux system and OpenCV are used to collect and process the color change. This system could detect 14 kinds of VOCs, achieving visualization of gas sensor detection, and laying a foundation of further qualitative identification of VOCs.

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