absorption spectroscopy Articles

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Comparison of atomic absorption and fluorescence spectroscopic methods for the routine determination of urinary arsenic

by Springer  (Feb. 1, 2005)

Objective: Interpretation of urinary arsenic measurements is sometimes difficult because of the absorption of seafood that contains trimethylated arsenic forms (arsenobetaine and arsenocholine). The objective of this study was to develop a rapid and robust technique for the measurement of the sum of inorganic arsenic metabolites. Methods: ...

Measurement of a Doubly Substituted Methane Isotopologue, 13CH3D

by Aerodyne Research, Inc.  (Oct. 14, 2014)

ABSTRACT: Methane is an important energy resource and significant long-lived greenhouse gas. Carbon and hydrogen isotope ratios have been used to better constrain the sources of methane but interpretations based on these two parameters alone can often be inconclusive. The precise measurement of a doubly substituted methane isotopologue, 13CH3D, is ...

Spectroscopic analysis of boron porphyrin complexes

by Inderscience Publishers  (Apr. 21, 2014)

Spectroscopic analyses of diboron porphyrin complexes have been performed using femtosecond transient absorption spectroscopy, fluorescence spectroscopy measurements, IR and Raman spectroscopy as well as DFT and TDDFT calculations. Transient absorption spectroscopy was used to study the dynamics of the transient species by exciting the molecule ...

Characterizing natural dissolved organic matter in a freshly submerged catchment (Three Gorges Dam, China) using UV absorption, fluorescence spectroscopy and PARAFAC

by IWA Publishing  (Feb. 1, 2012)

This study applied parallel factor analysis (PARAFAC) to fluorescence excitation–emission matrices (EEMs) of natural water samples in a freshly submerged catchment in the upper reach of Three Gorges Dam (China). Two fluorescent natural dissolved organic matter (NDOM) components (humic/fulvic-like) were uncovered and were positively correlated with ...

Spectroscopic study of the interaction of heavy metals with organic acids

by Inderscience Publishers  (Nov. 6, 2008)

The ongoing progress in spectroscopic methods of analysis has resulted in a growing interest in the nature of pollutants and hence the possibility of controlling their levels in the environment. This paper describes a study of the fate of some pollutants in both soil and water at two selected areas in the north of Cairo, Egypt. Samples were ...

Validation and calibration of a spectroscopic technique for determination of gas plume temperature

by D&P Instruments  (Jan. 1, 2003)

Abstract Results are reported from a continuing program of research into the physics and spectroscopy of heated stack plumes. Simultaneous thermocouple and spectrometer measurements are used to study sideways—directed plumes from an internal combustion engine and a propane-burning plume generator. A previously-reported result, that the ratio ...

Spectroscopic investigation of II–VI core-shell nanoparticles: CdSe/CdS

by Inderscience Publishers  (Feb. 3, 2004)

CdSe and CdSe/CdS core/shell nanoparticles were prepared by a one-pot synthesis process. The CdSe/CdS core/shell nanoparticles showed red-shift absorption and emission spectra compared to the CdSe core. An optimal reaction time for CdS to form on the CdSe nanoparticles was evaluated and the highest photoluminescence yield of approximately equal to ...

Spectroscopic tools for remote sensing of greenhouse gases CH 4, CF 4 and SF 6

by Springer  (Feb. 7, 2003)

Abstract Highly symmetrical molecules such as CH 4, CF 4 or SF 6 are known to be atmospheric pollutants and greenhouse gases. High-resolution spectroscopy in the infrared is particularly suitable for the monitoring of gas concentration and radiative transfers in the earth's atmosphere. This technique requires extensive theoretical studies for the ...

FTIR Spectroscopy

by CIC Photonics, Inc.  (Aug. 9, 2011)

Fourier Transform Infrared (FTIR) Spectroscopy bases its functionality on the principle that almost all molecules absorb infrared light. Only the monatomic (He, Ne, Ar, etc) and homopolar diatomic (H2, N2, O2, etc) molecules do not absorb infrared light. Molecules only absorb infrared light at those frequencies where the infrared light affects the ...

Beginners Guide to Spectroscopy - Transmission

by Specac Limited  (Feb. 28, 2014)

This is the first part of our introduction to Spectroscopy, more can be found on our blog (http://specac.blogspot.co.uk). Introduction Transmission spectroscopy is the oldest and simplest technique for analysing samples in infrared. This ...

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