scholarly journals Toward the Required Detection Limits for Volatile Organic Constituents in Marine Environments with Infrared Evanescent Field Chemical Sensors

Sensors ◽  
2019 ◽  
Vol 19 (17) ◽  
pp. 3644 ◽  
Author(s):  
Dettenrieder ◽  
Raichlin ◽  
Katzir ◽  
Mizaikoff
Keyword(s):  
Silver Halide ◽  
Environmental Pollutants ◽  
Simultaneous Detection ◽  
Warning System ◽  
Detection Limits ◽  
Evanescent Field ◽  
Sensor System ◽  
Long Term Stability ◽  
Volatile Organic ◽  
Seawater Samples

A portable sensor system for the simultaneous detection of multiple environmentally relevant volatile organic compounds (VOCs) in real seawater based on Fourier transform infrared fiber-optic evanescent wave spectroscopy (FT-IR-FEWS) was developed. A cylindrical silver halide (AgX) fiber with an ethylene/propylene copolymer (E/P-co) coated flattened segment was used as an active optical transducer. The polymer membrane enriches the hydrophobic analytes, while water is effectively excluded from the penetration depth of the evanescent field. Determination of multicomponent mixtures (i.e., 10 VOCs in real-world seawater samples) collected in Arcachon Bay, France revealed a high accuracy and reproducibility with detection limits down to 560 ppb. The measurement showed no significant influence from changing water conditions (e.g., salinity, turbidity, and temperature or other interfering substances). The time constants for 90% saturation of the polymer ranged from 20 to 60 min. The sensor system is capable of being transported for on-site monitoring of environmental pollutants in aqueous matrices with efficient long-term stability, thus showing great potential to be utilized as an early warning system.

scholarly journals Development of a Water Matrix Certified Reference Material for Volatile Organic Compounds Analysis in Water

Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4370
Author(s):  
Liping Fang ◽  
Linyan Huang ◽  
Gang Yang ◽  
Yang Jiang ◽  
Haiping Liu ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Reference Material ◽  
Organic Compounds ◽  
Certified Reference Material ◽  
Pure Water ◽  
Term Stability ◽  
Long Term Stability ◽  
Water Matrix ◽  
Volatile Organic

Water matrix certified reference material (MCRM) of volatile organic compounds (VOCs) is used to provide quality assurance and quality control (QA/QC) during the analysis of VOCs in water. In this research, a water MCRM of 28 VOCs was developed using a “reconstitution” approach by adding VOCs spiking, methanol solution into pure water immediately prior to analysis. The VOCs spiking solution was prepared gravimetrically by dividing 28 VOCs into seven groups, then based on ISO Guide 35, using gas chromatography-mass spectrometry (GC-MS) to investigate the homogeneity and long-term stability. The studies of homogeneity and long-term stability indicated that the batch of VOCs spiking solution was homogeneous and stable at room temperature for at least 15 months. Moreover, the water MCRM of 28 VOCs was certified by a network of nine competent laboratories, and the certified values and expanded uncertainties of 28 VOCs ranged from 6.2 to 17 μg/L and 0.5 to 5.3 μg/L, respectively.

A long-term stable paper-based glucose sensor using a glucose oxidase-loaded, Mn2BPMP-conjugated nanocarrier with a smartphone readout

Nanoscale ◽  
2021 ◽  
Author(s):  
Soyeon Yoo ◽  
Kiyoon Min ◽  
Giyoong Tae ◽  
Min Su Han
Keyword(s):  
Glucose Oxidase ◽  
Glucose Sensor ◽  
Sensor System ◽  
Term Stability ◽  
Long Term Stability

A paper-type sensor system was devised using an enzyme-loaded, artificial peroxidase-conjugated nanocarrier to maintain long-term stability with smartphone readout.

In Situ Sensing of Volatile Organic Compounds in Groundwater: First Field Tests of a Mid-Infrared Fiber-Optic Sensing System

2003 ◽  
Vol 57 (6) ◽  
pp. 607-613 ◽  
Author(s):  
H. Steiner ◽  
M. Jakusch ◽  
M. Kraft ◽  
M. Karlowatz ◽  
T. Baumann ◽  
...  
Keyword(s):  
Real World ◽  
Fiber Optic ◽  
Silver Halide ◽  
Field Tests ◽  
Reference Analysis ◽  
Mid Infrared ◽  
Sensor Head ◽  
Aquifer System ◽  
Volatile Organic

A prototype mid-infrared sensor system for the determination of volatile organic pollutants in groundwater was developed and tested under real-world conditions. The sensor comprises a portable Fourier transform infrared spectrometer, coupled to the sensor head via mid-infrared transparent silver halide fiber-optic cables. A 10 cm unclad middle section of the 6-m-long fiber is coated with ethylene propylene copolymer in order to enrich the analytes within the penetration depth of the evanescent field protruding from the fiber sensor head. A mixture of tetrachloroethylene, dichlorobenzene, diethyl phthalate, and xylene isomers at concentrations in the low ppm region was investigated qualitatively and quantitatively in an artificial aquifer system filled with Munich gravel. This simulated real-world site at a pilot scale enables in situ studies of the sensor response and spreading of the pollutants injected into the system with controlled groundwater flow. The sensor head was immersed into a monitoring well of the aquifer system at a distance of 1 m downstream of the sample inlet and at a depth of 30 cm. Within one hour, the analytes were clearly identified in the fingerprint region of the IR spectrum (1300 to 700 cm−1). The results have been validated by head-space gas chromatography, using samples collected during the field measurement. Five out of six analytes could be discriminated simultaneously; for two of the analytes the quantitative results are in agreement with the reference analysis.

scholarly journals Mid-IR evanescent-field fiber sensor with enhanced sensitivity for volatile organic compounds

RSC Advances ◽  
2019 ◽  
Vol 9 (37) ◽  
pp. 21186-21191 ◽  
Author(s):  
Farah Alimagham ◽  
Max Platkov ◽  
Joshua Prestage ◽  
Svetlana Basov ◽  
Gregory Izakson ◽  
...  
Keyword(s):  
Organic Compound ◽  
Gas Phase ◽  
Organic Compounds ◽  
Volatile Organic Compound ◽  
Evanescent Field ◽  
Fiber Sensor ◽  
Porous Coating ◽  
Enhanced Sensitivity ◽  
Volatile Organic ◽  
Increased Sensitivity

Increased sensitivity of mid-IR evanescent field sensing for gas-phase volatile organic compound detection using a nano-porous coating of an optical-fibre.

A Wearable and Wireless Sensor System for Real-Time Monitoring of Toxic Environmental Volatile Organic Compounds

2009 ◽  
Vol 9 (12) ◽  
pp. 1734-1740 ◽  
Author(s):  
Francis Tsow ◽  
Erica Forzani ◽  
Anant Rai ◽  
Rui Wang ◽  
Ray Tsui ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Real Time ◽  
Organic Compounds ◽  
Sensor System ◽  
Wireless Sensor ◽  
Real Time Monitoring ◽  
Volatile Organic

A Review on Volatile Organic Compounds (VOCs) as Environmental Pollutants: Fate and Distribution

2018 ◽  
Vol 4 (02) ◽  
pp. 14-26 ◽  
Author(s):  
Puneeta Pandey ◽  
Radheshyam Yadav
Keyword(s):  
Health Effects ◽  
Organic Compounds ◽  
Health Risks ◽  
Environmental Pollutants ◽  
Contaminated Groundwater ◽  
Human Beings ◽  
Adverse Health Effects ◽  
Household Products ◽  
Volatile Organic ◽  
Concentration Levels

VOCs include a variety of organic chemicals emitted as gases from certain solids and liquids. The nature and extent of these health effects depend on the concentration levels of these VOCs and the duration of their exposure and pose adverse health effects to humans. Although VOCs are found in a variety of industrial, commercial and household products; it is their concentration in wells and groundwater that has gained attention in recent years. When VOCs are spilled or improperly disposed of, a portion of it after evaporation are soaked on the ground, which eventually reaches wells and groundwater. Drinking of inadequately treated VOCs contaminated groundwater is potentially harmful to human beings. Trichloroethylene and vinyl chloride are most toxic and carcinogenic among all VOCs. The present paper reviews the sources, health risks, transport and fate of these VOCs in groundwater. Besides, analytical methods for the detection of VOCs in groundwater and techniques for mitigation of VOCs from groundwater have also been discussed.

Silicon Carbide Field Effect Transistors for Detection of Ultra-Low Concentrations of Hazardous Volatile Organic Compounds

2014 ◽  
Vol 778-780 ◽  
pp. 1067-1070 ◽  
Author(s):  
Donatella Puglisi ◽  
Jens Eriksson ◽  
Christian Bur ◽  
Andreas Schütze ◽  
Anita Lloyd Spetz ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Volatile Organic Compounds ◽  
Relative Humidity ◽  
Organic Compounds ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Long Term Stability ◽  
Volatile Organic ◽  
Recovery Times ◽  
Response And Recovery

Gas sensitive silicon carbide field effect transistors with nanostructured Ir gate layers have been used for the first time for sensitive detection of volatile organic compounds (VOCs) at part per billion level for indoor air quality applications. Formaldehyde, naphthalene, and benzene have been used as typical VOCs in dry air and under 10% and 20% relative humidity. A single VOC was used at a time to study long-term stability, repeatability, temperature dependence, effect of relative humidity, sensitivity, response and recovery times of the sensors.

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