High-sensitivity infrared attenuated total reflectance sensors for in situ multicomponent detection of volatile organic compounds in water

2016 ◽  
Vol 11 (2) ◽  
pp. 377-386 ◽  
Author(s):  
Rui Lu ◽  
Wen-Wei Li ◽  
Boris Mizaikoff ◽  
Abraham Katzir ◽  
Yosef Raichlin ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
High Sensitivity ◽  
Attenuated Total Reflectance ◽  
Total Reflectance ◽  
Volatile Organic

scholarly journals Chemiresistor microsensors for in-situ monitoring of volatile organic compounds : final LDRD report.

2003 ◽  
Author(s):  
Michael Loren Thomas ◽  
Robert Clark Hughes ◽  
Ara S Kooser ◽  
Lucas K McGrath ◽  
Clifford Kuofei Ho ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
In Situ Monitoring ◽  
Volatile Organic

Near infrared chemo-responsive dye intermediaries spectra-based in-situ quantification of volatile organic compounds

2018 ◽  
Vol 254 ◽  
pp. 597-602 ◽  
Author(s):  
Felix Y.H. Kutsanedzie ◽  
Lin Hao ◽  
Song Yan ◽  
Qin Ouyang ◽  
Quansheng Chen
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Near Infrared ◽  
Volatile Organic

scholarly journals Variability of Total Volatile Organic Compounds (TVOC) in the Indoor Air of Retail Stores

2019 ◽  
Vol 16 (23) ◽  
pp. 4622 ◽  
Author(s):  
Jia ◽  
Cao ◽  
Valaulikar ◽  
Fu ◽  
Sorin
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Indoor Air ◽  
High Sensitivity ◽  
Temporal Variations ◽  
Retail Stores ◽  
Volatile Organic ◽  
Systematic Understanding ◽  
Total Volatile Organic Compounds ◽  
Comfort Parameters

Volatile organic compounds (VOCs) are released to the indoor air of retail stores from numerous products and activities, but available literature lacks a systematic understanding of the variability of VOC concentrations. In this study, we measured concentrations of total VOCs (TVOC) in 32 retail stores using a high-sensitivity photoionization detector (PID). Indoor thermal comfort parameters, including temperature, relative humidity, and air velocity, were simultaneously measured using an anemometer. The store-level TVOC concentrations ranged from 30 to 869 ppb and exceeded the LEED guideline in 31 stores. TVOC levels were notably high in hardware stores (median = 536 ppb, p = 0.0002) and paints, household, and home accessories sections within stores (p < 0.05). TVOC levels were elevated in mornings and evenings, possibly due to low ventilation and cleaning activities at the beginning and end of business hours. The between-store, within-store, and temporal variations accounted for 85%, 0.5%, and 14% of the total variance, respectively. The variance structure suggested that in-store VOC concentrations were predominantly driven by their source location, and representative monitoring should first consider covering various store types. Current store VOC levels present health concerns, but further studies are needed to evaluate risks among customers.

In-Situ Analysis of Volatile Organic Compounds in Biogas Fermentation Processes Using a Metal Oxide Gas Sensor Array

2020 ◽  
Vol MA2020-01 (28) ◽  
pp. 2153-2153
Author(s):  
Binayak Ojha ◽  
Divyashree Narayana ◽  
Margarita Aleksandrova ◽  
Heinz Kohler ◽  
Matthias Schwotzer ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Metal Oxide ◽  
Gas Sensor ◽  
Organic Compounds ◽  
Sensor Array ◽  
Fermentation Processes ◽  
Gas Sensor Array ◽  
Volatile Organic ◽  
Metal Oxide Gas Sensor

scholarly journals Low Molecular Weight Volatile Organic Compounds Indicate Grazing by the Marine Rotifer Brachionus plicatilis on the Microalgae Microchloropsis salina

Metabolites ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 361
Author(s):  
Carolyn L. Fisher ◽  
Pamela D. Lane ◽  
Marion Russell ◽  
Randy Maddalena ◽  
Todd W. Lane
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Alternative Energy ◽  
Brachionus Plicatilis ◽  
Machine Learning Algorithms ◽  
Algal Culture ◽  
Mass Spectral ◽  
Volatile Organic ◽  
Non Destructive

Microalgae produce specific chemicals indicative of stress and/or death. The aim of this study was to perform non-destructive monitoring of algal culture systems, in the presence and absence of grazers, to identify potential biomarkers of incipient pond crashes. Here, we report ten volatile organic compounds (VOCs) that are robustly generated by the marine alga, Microchloropsis salina, in the presence and/or absence of the marine grazer, Brachionus plicatilis. We cultured M. salina with and without B. plicatilis and collected in situ volatile headspace samples using thermal desorption tubes over the course of several days. Data from four experiments were aggregated, deconvoluted, and chromatographically aligned to determine VOCs with tentative identifications made via mass spectral library matching. VOCs generated by algae in the presence of actively grazing rotifers were confirmed via pure analytical standards to be pentane, 3-pentanone, 3-methylhexane, and 2-methylfuran. Six other VOCs were less specifically associated with grazing but were still commonly observed between the four replicate experiments. Through this work, we identified four biomarkers of rotifer grazing that indicate algal stress/death. This will aid machine learning algorithms to chemically define and diagnose algal mass production cultures and save algae cultures from imminent crash to make biofuel an alternative energy possibility.

High sensitivity and fast response SnO2 and La-SnO2 catalytic pellet sensors in detecting volatile organic compounds

2011 ◽  
Vol 89 (3) ◽  
pp. 186-192 ◽  
Author(s):  
Gaik Tin Ang ◽  
Geik Hoon Toh ◽  
Mohamad Zailani Abu Bakar ◽  
Ahmad Zuhairi Abdullah ◽  
Mohd Roslee Othman
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
High Sensitivity ◽  
Fast Response ◽  
Volatile Organic
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