Detection of sulfur dioxide at low parts-per-million concentrations using low-cost planar electrodes with ionic liquid electrolytes.
Sign Up to like & getrecommendations! Published in 2020 at "Analytica chimica acta"
DOI: 10.1016/j.aca.2020.05.037
Abstract: Sulfur dioxide (SO2) is a toxic gas at low parts-per-million (ppm) concentrations, with a permissible exposure limit (PEL) of 2 ppm. Its detection is mandatory, particularly in the fields of occupational health and safety, and environmental… read more here.
Keywords: detection; parts per; sulfur dioxide; low parts ... See more keywords
Parts-per-Million Detection of Trace Crystal Forms Using AF-PTIR Microscopy.
Sign Up to like & getrecommendations! Published in 2022 at "Analytical chemistry"
DOI: 10.1021/acs.analchem.2c02358
Abstract: Autofluorescence-detected photothermal mid-infrared (AF-PTIR) microscopy was shown to enable parts-per-million detection of α-indomethacin impurity in γ-indomethacin samples. Subtle differences in the photothermal response of the UV-autofluorescence of two indomethacin crystal polymorphs were used for sub-micron… read more here.
Keywords: ptir microscopy; million detection; microscopy; per million ... See more keywords
Nanoplasmonic NO2 Sensor with a Sub-10 Parts per Billion Limit of Detection in Urban Air
Sign Up to like & getrecommendations! Published in 2022 at "ACS Sensors"
DOI: 10.1021/acssensors.1c02463
Abstract: Urban air pollution is a critical health problem in cities all around the world. Therefore, spatially highly resolved real-time monitoring of airborne pollutants, in general, and of nitrogen dioxide, NO2, in particular, is of utmost… read more here.
Keywords: urban air; air; no2 sensor; parts per ... See more keywords
Highly sensitive optical waveguide sensor for SO2 and H2S detection in the parts-per-trillion regime using tetraaminophenyl porphyrin
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Modern Optics"
DOI: 10.1080/09500340.2020.1758817
Abstract: ABSTRACT Optical waveguide (OWG) sensors present great potential for detecting trace levels of harmful gases because of their high sensitivity and anti-electromagnetic interference. However, OWG-based SO2 and H2S-detecting sensors in the parts-per-trillion (ppt) range are… read more here.
Keywords: detection; so2; parts per; so2 h2s ... See more keywords
A limit on variations in the fine-structure constant from spectra of nearby Sun-like stars
Sign Up to like & getrecommendations! Published in 2022 at "Science"
DOI: 10.1126/science.abi9232
Abstract: The fine structure constant α sets the strength of the electromagnetic force. The Standard Model of particle physics provides no explanation for its value, which could potentially vary. The wavelengths of stellar absorption lines depend… read more here.
Keywords: per billion; structure constant; fine structure; spectra nearby ... See more keywords
Parts per trillion (ppt) gold in groundwater: can we believe it, what is anomalous and how do we use it?
Sign Up to like & getrecommendations! Published in 2019 at "Geochemistry: Exploration, Environment, Analysis"
DOI: 10.1144/geochem2019-032
Abstract: There is a pressing need for new exploration tools to target and vector towards mineralization in covered terrains. Groundwater provides a valuable and under-utilized geochemical sampling medium, and represents an important and cost-effective tool to… read more here.
Keywords: hydrogeochemistry; groundwater; parts per; exploration ... See more keywords
Quantification of Rare Earth Elements in the Parts Per Million Range: A Novel Approach in the Application of Laser-Induced Breakdown Spectroscopy
Sign Up to like & getrecommendations! Published in 2022 at "Applied Spectroscopy"
DOI: 10.1177/00037028221092051
Abstract: This work extends a previous percentage level concentration study of the optical emission spectra for six rare earth elements, europium (Eu), gadolinium (Gd), lanthanum (La), praseodymium (Pr), neodymium (Nd), and samarium (Sm), along with the… read more here.
Keywords: earth elements; spectroscopy; rare earth; per million ... See more keywords
High-Precision Trace Hydrogen Sensing by Multipass Raman Scattering
Sign Up to like & getrecommendations! Published in 2023 at "Sensors"
DOI: 10.3390/s23115171
Abstract: Despite its growing importance in the energy generation and storage industry, the detection of hydrogen in trace concentrations remains challenging, as established optical absorption methods are ineffective in probing homonuclear diatomics. Besides indirect detection approaches… read more here.
Keywords: multipass; per billion; raman scattering; hydrogen ... See more keywords