absorption spectroscopy Articles

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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 ...

Indirect Determination of Gold Purity by Measurement of Impurities with Flame Atomic Absorption Spectroscopy

by Buck Scientific Inc  (Jan. 1, 2006)

The determination of the purity of scrap and refined gold is a very important procedure for the financial markets, the jewelry business and the electronics industry. Over the years, the classical fire assay technique has been used for gold determination but this is a very labor-intensive procedure, and prone to many operator errors. ...

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 ...

Determination of Major Electrolytes, Minor Minerals, and Trace Heavy Metals in Physiological Fluids by Flame and Graphite Furnace Atomic Absorption Spectroscopy

by Buck Scientific Inc  (Jan. 1, 2006)

Accurate measurements of specific metals in various biological systems is extremely important. These metals can be classified into several groups: the high level major electrolytes (Na, K, Ca, Mg), which are crucial to normal primary physiological processes like cellular activity and metabolism; the minor minerals (Fe, Mn, Zn, Co, Cu), which ...

Effects of maturity on chlorophyll-related absorption in nectarines, measured by non-destructive time-resolved reflectance spectroscopy

by Inderscience Publishers  (Dec. 12, 2006)

The ripening of fruits like nectarines and peaches is characterised by the decrease in chlorophyll content or colour of the fruit flesh. However, measuring the colour of fruit flesh is usually not conducted, as there is a lack of suitable techniques. Time-Resolved Reflectance Spectroscopy (TRS) is a novel technique that can measure the light ...

Nanoparticles and nanowires: synchrotron spectroscopy studies

by Inderscience Publishers  (Aug. 22, 2008)

This paper reviews the research in nanomaterials conducted in our laboratory in the last decade using conventional and synchrotron radiation techniques. While preparative and conventional characterisation techniques are described, emphasis is placed on the analysis of nanomaterials using synchrotron radiation. Materials of primary interests are ...

Determination of macro, micro nutrient and trace element concentrations in Indian medicinal plants using instrumental neutron activation analysis and atomic absorption spectroscopy techniques

by Inderscience Publishers  (Mar. 5, 2010)

Specific parts (fruits and seeds) of different medicinal plants often used in Indian Ayurvedic system were analysed for 18 elements (K, Mn, Na, Fe, Zn, Cu, Co, Br, Sm, Cl, La, Al, Cr, Ca Cd, Ni, Pb and Hg) by employing instrumental neutron activation analysis (INAA) and atomic absorption spectroscopy (AAS) techniques. The samples were irradiated ...

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 ...

Low level moisture measurement in Natural gas using a Lunable diode laser absorption spectroscopy (tdlas) based laser case study

by Ametek Process Instruments - THERMOX  (Nov. 24, 2014)

Introduction The measurement of water vapor in natural gas has long been of industrial importance, and has been addressed by a variety of analytical techniques over the years. Chief among these techniques has been the quartz crystal microbalance (QCM) based analyzers. The QCM technology is still the workhorse for production and pipeline ...

Wastewater salinity assessment using near infrared spectroscopy

by IWA Publishing  (Aug. 29, 2013)

The visible and near infrared spectroscopy is a fast and inexpensive non-destructive technique for the prediction of concentrations of salts in wastewater. Conventional chemical methods are usually used, which are very accurate, take more time and require special techniques for sampling, storing and pretreatment of wastewater. In this work we ...

Synchrotron radiation, soft-X-ray spectroscopy and nanomaterials

by Inderscience Publishers  (Feb. 3, 2004)

Both synchrotron radiation based soft-X-ray absorption spectroscopy (XAS) and resonant soft-X-ray emission spectroscopy (XES) on a variety of nano-structured systems has yielded characteristic fingerprints. With high-resolution monochromatized synchrotron radiation excitation, resonant inelastic X-ray scattering (RIXS) has emerged as a new source ...

PyTrA: ultra–fast transient absorption data analysis software

by Inderscience Publishers  (Apr. 21, 2014)

Ultra–fast transient absorption spectra are inherently complex data sets to process. PyTrA is a new software system that has been written to bring together many of the most well–known techniques of analysis into one easy–to–use package. Figure of publishable quality can be generated, and advanced 3D graphs can be used to view the transient data in ...

Measurement of Cesium in Tap Water and Soil by Atomic Absorption Spectrometry

by Shimadzu Scientific Instruments Inc  (Nov. 19, 2012)

Recently, technologies that can efficiently remove radioactive cesium (chiefly Cs-137) from water and soil have been actively researched. The study and evaluation of these removal technologies can be conducted using Cs-133, an easy-to-handle, stable substance, yet chemically similar to Cs-137. Cesium can be analyzed using atomic absorption ...

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: ...

Preparation of cationic starch microspheres and study on their absorption to anionic-type substance

by IWA Publishing  (May 18, 2015)

Cationic starch microspheres (CSMs) were prepared from lab-made neutral starch-based microspheres using a cationic adsorbent, namely 3-chloro-2-hydroxypropyltrimethyl ammonium chloride, as the cationic etherifying agent. Detection by scanning electron microscopy, Fourier transform infrared spectroscopy (FTIR), and laser diffraction techniques ...

Alteration of hydration absorption features in reflectance spectra of selected sulfates in a low pressure environment: 0.45-4.3 μm

by D&P Instruments  (Jan. 1, 2006)

Introduction: Spectral reflectance properties from. 0.45 to 4.3 μm have been investigated for a number of. mineral samples. Eight mineral samples were placed. in one of the environmental simulation chambers in the. University of Winnipeg’s spectroscopy lab [1,2]. The. eight samples and two standards spent 38 days in the. chamber. Of the ...

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 ...

Covalently-bound organic monolayers for biosensor applications

by Inderscience Publishers  (Aug. 10, 2009)

In this paper, we present a detailed investigation on monolayer formation with thicknesses amounting 1 nm to 3 nm on silicon and silicon nitride surfaces. Thermal and photochemical methods are successfully used to form such stable and densely backed monolayers. Further, functionalisation of these surfaces with activated esters, amine groups are ...

Catalyst characterisation of Fe-doped-titanium dioxide

by Inderscience Publishers  (Apr. 5, 2010)

Fe (5 wt. %) doped TiO2 was synthesised using a hydrothermal method. This material was characterised by X-Ray diffraction (XRD), Raman spectroscopy, scanning electron microscope (SEM) imaging, BET surface area, X-Ray photoelectron spectroscopy (XPS) and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS). The BET surface area was 136 ...

Characterisation of the recalcitrant organic compounds in leachates formed during the anaerobic biodegradation of waste

by IWA Publishing  (Jan. 1, 2011)

This study investigates the use of UV absorption and fluorescence spectroscopy to assess the early development of recalcitrant organic compounds in leachates formed during the anaerobic biodegradation of municipal solid waste. Biochemical methane potential tests were carried out on fresh waste (FW) and composted waste (CW) over a period of 150 ...

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