Results 251 to 260 of about 70,371 (306)
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Headspace Volatiles of Marijuana
Nature, 1973THE sweet odour of Cannabis sativa, L. is of special interest as a possible means for the detection of illicit marijuana traffic. US Customs dogs, trained to alert to the odour of marijuana and hashish, are successfully used to find concealed contraband.
L V, Hood, M E, Dames, G T, Barry
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Propellants, Explosives, Pyrotechnics, 2021
AbstractCompositional analysis of crude and recrystallized TATP in solution and the headspace above solid material did not identify acetone presence in any sample. Acetone was detected in trace levels in crude TATP samples heated to 65 °C for 42 hours. The concentration of which was observed to decrease over time.
Jonathan R. Stromberg +1 more
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AbstractCompositional analysis of crude and recrystallized TATP in solution and the headspace above solid material did not identify acetone presence in any sample. Acetone was detected in trace levels in crude TATP samples heated to 65 °C for 42 hours. The concentration of which was observed to decrease over time.
Jonathan R. Stromberg +1 more
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Influence of headspace oxygen on quality and shelf life of extra virgin olive oil during storage
, 2020This study evaluated the impact of low O2 headspace in clear and dark containers at different storage temperatures (10 °C and 28 °C) on the quality and shelf life of extra virgin olive oil (EVOO).
Basheer M. Iqdiam +5 more
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Pervaporation as an Alternative to Headspace
Analytical Chemistry, 1997The use of pervaporation as an alternative to headspace is proposed. The analytical system involves the speciation of organomercury compounds in solid samples using pervaporation, which has been coupled for the first time to gas chromatography. The speciation of mercury as Me(2)Hg, Et(2)Hg, and MeHgCl has been carried out without any derivatization of ...
D W, Bryce +2 more
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Headspace Constituents of Opium
Planta Medica, 1994The headspace of medicinal opium (Ph. Ned. 8) was analyzed by means of GC-FID, (+EI)-GC-MS (low and high resolution), and GC-FTIR. After olfactoric evaluation of the headspace sample by professional perfumers by the use of the GC-sniffing technique and after correlation tests with trained police dogs, more than 70 components were identified.
G, Buchbauer, A, Nikiforov, B, Remberg
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Headspace mode of liquid phase microextraction: A review
Trends in Analytical Chemistry (TrAC), 2019In recent years, liquid phase microextraction (LPME) as a solvent–minimized and microscale implementation of sample pretreatment procedure of liquid–liquid extraction has been introduced and obtained great attention among the researchers due to its ...
Mohammad Reza Afshar Mogaddam +4 more
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Emergency Nurse, 2017
Headspace is designed to teach users meditation and mindfulness, which has been recommended by the NHS and National Institute for Health and Care Excellence to help mental well-being.
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Headspace is designed to teach users meditation and mindfulness, which has been recommended by the NHS and National Institute for Health and Care Excellence to help mental well-being.
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In-vessel headspace liquid-phase microextraction
Analytica Chimica Acta, 2021A new mode of headspace liquid-phase microextraction termed in-vessel headspace liquid-phase microextraction (IV-HS-LPME) has been developed. A plastic vessel was used as a holder for an extraction phase. Problems with drop stability, limitations in the stirring speed, and too little volume of the acceptor phase have been completely eliminated.
Aimad-Eddine Tamen, Andriy Vishnikin
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Analytica Chimica Acta, 2018
A novel pressure-assisted dual-headspace lab-in-syringe microextraction technique is presented as an alternative approach for automatic on-line membraneless gas separation of volatile compounds. The developed gas-liquid microextraction procedure is based
G. Giakisikli, A. Anthemidis
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A novel pressure-assisted dual-headspace lab-in-syringe microextraction technique is presented as an alternative approach for automatic on-line membraneless gas separation of volatile compounds. The developed gas-liquid microextraction procedure is based
G. Giakisikli, A. Anthemidis
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Journal of Chromatography A, 2022
In this work, headspace single-drop microextraction (HS-SDME) method and headspace (HS) method were developed and compared to determine methanol by gas chromatography with flame ionization detector (GC-FID). Several factors influencing extraction efficiency, such as extraction time, temperature, sample volume, stirring rate and extraction solvent were ...
Benyuan, Qin +6 more
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In this work, headspace single-drop microextraction (HS-SDME) method and headspace (HS) method were developed and compared to determine methanol by gas chromatography with flame ionization detector (GC-FID). Several factors influencing extraction efficiency, such as extraction time, temperature, sample volume, stirring rate and extraction solvent were ...
Benyuan, Qin +6 more
openaire +2 more sources