absorption spectroscopy Articles

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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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

Identification of forensic fabrics using a portable Raman spectrometer

by B&W Tek, Inc  (Oct. 28, 2014)

At a crime scene, a police officer collects a fiber sample that may prove to be invaluable evidence in identifying a criminal or exonerating an innocent person. While FTIR has been used for analysis in the past, the strong absorption of the fabric or the glass slide where it is mounted makes the spectrum very hard to interpret. In recent years, ...

Analysis of Automotive fluids case study

by Specac Limited  (Nov. 25, 2014)

Introduction The liquid sample is one of the most common types of samples submitted for analysis and comprises a vast array of pure compounds and solutions. As an example, several liquids are used in an automobile to sustain critical elements such as lubricating the engine or drive train and to supply mundane functions like washing the windows or ...

Analysis of Automotive Polymers - Case Study

by Specac Limited  (Nov. 25, 2014)

The above criteria are important to the professional scientist or laboratory chemist. Introduction Polymers are present in daily life. From the wrappings around the food we eat to the sacks used for the garbage, polymers are practically everywhere. The automobile is no exception. Polymers comprise greater than 40% of a modern automobile; the ...

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