Improving analysis from second-derivative uv-absorption spectrometry

1978 ◽  
Vol 17 (5) ◽  
pp. 724 ◽  
Author(s):  
Alan R. Hawthorne ◽  
John H. Thorngate
Keyword(s):  
Absorption Spectrometry ◽  
Uv Absorption ◽  
Second Derivative

Application of Second-Derivative UV-Absorption Spectrometry to Polynuclear Aromatic Compound Analysis

1979 ◽  
Vol 33 (3) ◽  
pp. 301-305 ◽  
Author(s):  
Alan R. Hawthorne ◽  
John H. Thorngate
Keyword(s):  
Spectral Analysis ◽  
Least Squares ◽  
Aromatic Compound ◽  
Vapor Phase ◽  
Detection Limits ◽  
Absorption Spectrometry ◽  
Health Protection ◽  
Uv Absorption ◽  
Second Derivative

The increased awareness of the deleterious effects of polynuclear aromatic (PNA) compounds emphasizes the need for instruments that are capable of monitoring these compounds and also are suitable for use in health protection programs. Second-derivative UV-absorption spectrometry with least-squares spectral analysis shows promise as a method for analyzing vapor phase PNA's, as well as solutions containing these compounds. Detection limits of a few parts per billion are attainable for many PNA compounds. Examples are given showing the analytical capabilities of this procedure.

scholarly journals Gas Detection Using Portable Deep-UV Absorption Spectrophotometry: A Review

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5210 ◽  
Author(s):  
Sulaiman Khan ◽  
David Newport ◽  
Stéphane Le Calvé
Keyword(s):  
Gas Sensing ◽  
Low Cost ◽  
Absorption Spectrometry ◽  
Optical Filters ◽  
Uv Absorption ◽  
Uv Photodetectors ◽  
Absorption Spectrophotometry ◽  
Uv Emission ◽  
Selective Approach ◽  
Deep Uv

Several gas molecules of environmental and domestic significance exhibit a strong deep-UV absorption. Therefore, a sensitive and a selective gas detector based on this unique molecular property (i.e., absorption at a specific wavelength) can be developed using deep-UV absorption spectrophotometry. UV absorption spectrometry provides a highly sensitive, reliable, self-referenced, and selective approach for gas sensing. This review article addresses the recent progress in the application of deep-UV absorption for gas sensing owing to its inherent features and tremendous potentials. Applications, advancements, and challenges related to UV emission sources, gas cells, and UV photodetectors are assessed and compared. We present the relevant theoretical aspects and challenges associated with the development of portable sensitive spectrophotometer. Finally, the applications of UV absorption spectrometry for ozone, NO2, SO2, and aromatic organic compounds during the last decades are discussed and compared. A portable UV absorption spectrophotometer can be developed by using LEDs, hollow core waveguides (HCW), and UV photodetectors (i.e., photodiodes). LED provides a portable UV emission source with low power input, low-intensity drifts, low cost, and ease of alignment. It is a quasi-chromatic UV source and covers the absorption band of molecules without optical filters for absorbance measurement of a target analyte. HCWs can be applied as a miniature gas cell for guiding UV radiation for measurement of low gas concentrations. Photodiodes, on the other hand, offer a portable UV photodetector with excellent spectral selectivity with visible rejection, minimal dark current, linearity, and resistance against UV-aging.

Heterochromatic stray light in UV absorption spectrometry: a new test method

1982 ◽  
Vol 21 (18) ◽  
pp. 3354 ◽  
Author(s):  
K. D. Mielenz ◽  
V. R. Weidner ◽  
R. W. Burke
Keyword(s):  
Absorption Spectrometry ◽  
Test Method ◽  
Uv Absorption ◽  
Stray Light

scholarly journals Quantitative detection of H2S and CS2 mixed gases based on UV absorption spectrometry

RSC Advances ◽  
2017 ◽  
Vol 7 (80) ◽  
pp. 50889-50898 ◽  
Author(s):  
Xiaoxing Zhang ◽  
Zhaolun Cui ◽  
Zheng Cheng ◽  
Yalong Li ◽  
Hai Xiao
Keyword(s):  
Absorption Spectrometry ◽  
Uv Absorption ◽  
Quantitative Detection ◽  
Mixed Gases

H2S and CS2 can be quantitatively detected, as the decomposition components of insulating gas SF6.

scholarly journals Time-resolved, broadband UV-absorption spectrometry measurements of Criegee intermediate kinetics using a new photolytic precursor: unimolecular decomposition of CH2OO and its reaction with formic acid

2020 ◽  
Vol 22 (21) ◽  
pp. 11797-11808 ◽  
Author(s):  
Jari Peltola ◽  
Prasenjit Seal ◽  
Anni Inkilä ◽  
Arkke Eskola
Keyword(s):  
Formic Acid ◽  
Absorption Spectrometry ◽  
Uv Absorption ◽  
Unimolecular Decomposition ◽  
Kinetic Measurements ◽  
Time Resolved ◽  
Temperature And Pressure ◽  
Absorption Spectrometer

We present a time-resolved broadband cavity-enhanced UV-absorption spectrometer apparatus that we have constructed and utilized for temperature- and pressure-dependent kinetic measurements of formaldehyde oxide (CH2OO) reactions.

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