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

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.

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Reductive Dechlorinization of Halogenated Volatile Organic Compounds by Enhanced In Situ Microbial Degradation

Soil and Sediment Contamination An International Journal ◽

10.1080/20025891107618 ◽

2002 ◽

Vol 11 (3) ◽

pp. 437-437

Author(s):

John K. Meyer ◽

Timothy D. Johnson

Keyword(s):

Volatile Organic Compounds ◽

Organic Compounds ◽

Microbial Degradation ◽

Volatile Organic

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

ECS Meeting Abstracts ◽

10.1149/ma2020-01282153mtgabs ◽

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

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Modelling gas-phase recovery of volatile organic compounds during in situ thermal treatment

Journal of Contaminant Hydrology ◽

10.1016/j.jconhyd.2020.103698 ◽

2020 ◽

Vol 234 ◽

pp. 103698

Author(s):

Qianli Xie ◽

Kevin G. Mumford ◽

Bernard H. Kueper

Keyword(s):

Volatile Organic Compounds ◽

Thermal Treatment ◽

Gas Phase ◽

Organic Compounds ◽

Phase Recovery ◽

Volatile Organic

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

Metabolites ◽

10.3390/metabo10090361 ◽

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.

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