uv/vis Articles

93 Results found
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Quantification of polymer concentration in water using UV-Vis spectroscopy

by IWA Publishing  (Jun. 25, 2013)

The goal of this study was to develop a method that uses UV-Vis spectroscopy for the determination of residual polymer concentration water and environmental samples. UV-Vis absorbance measurements are quick and simple and can be usefully applied in research and practice. Five different polymers exhibiting a wide range of polymer characteristics ...

Feed-forward coagulant control using online UV/Vis monitoring

by IWA Publishing  (Apr. 3, 2013)

Water quality from the Murray River, Australia, can vary considerably and is expected to become more challenging to treat due to recent drought followed by widespread flooding and future climate change impacts. Better tools are required to help plant operators maintain water quality. Morgan water treatment plant (WTP) operates overnight to take ...

Comparison of discrete Fourier transform (DFT) and principal component analysis/DFT as forecasting tools for absorbance time series received by UV-visible probes installed in urban sewer systems

by IWA Publishing  (Mar. 13, 2014)

The objective of this work is to introduce a forecasting method for UV-Vis spectrometry time series that combines principal component analysis (PCA) and discrete Fourier transform (DFT), and to compare the results obtained with those obtained by using DFT. Three time series for three different study sites were used: (i) Salitre wastewater ...

Interaction of silver doped carbon nanotubes-cyclodextrin nanocomposites with Escherichia coli bacteria during water purification

by IWA Publishing  (Jun. 12, 2014)

Silver doped multi-walled carbon nanotube/β-cyclodextrin (1% Ag-MWCNTs/β-CD) nanocomposite was prepared by reductive pre-treatment of Ag+ on MWCNTs, followed by binding with β-CD. Crystalline structure, morphology and crystallite size estimation were carried out by X-ray diffraction (XRD), Fourier transform ...

Support to Aviation Control Service (SACS): an online service for near-real-time satellite monitoring of volcanic plumes

by NILU - The Norwegian Institute for Air Research  (May 16, 2014)

Volcanic eruptions emit plumes of ash and gases into the atmosphere, potentially at very high altitudes. Ash-rich plumes are hazardous for airplanes as ash is very abrasive and easily melts inside their engines. With more than 50 active volcanoes per year and the ever-increasing number of commercial flights, the safety of airplanes is a real ...

Electrochemically synthesised polyaniline on marine grade aluminium

by Inderscience Publishers  (Apr. 21, 2014)

Polyaniline films were deposited on marine grade 5083 aluminium, and were examined and characterised with the use of cyclic voltammetry, UV–Vis spectroscopy and SEM imaging. The polyaniline films were electrochemically synthesised from 0.5 M oxalic acid solutions containing 0.1 M aniline, under potentiostatic control. The presence of polyaniline ...

Method for outlier detection: a tool to assess the consistency between laboratory data and ultraviolet–visible absorbance spectra in wastewater samples

by IWA Publishing  (Jun. 5, 2014)

Reliable estimations of the evolution of water quality parameters by using in situ technologies make it possible to follow the operation of a wastewater treatment plant (WWTP), as well as improving the understanding and control of the operation, especially in the detection of disturbances. However, ultraviolet (UV)–Vis sensors have to be ...

Preparation, characterisation and photocurrent study of sol–gel–derived Al, Mg–doped ZnO transparent thin films

by Inderscience Publishers  (Mar. 17, 2014)

In this work, sol–gel spin–coating was employed to prepare ZnO, Al–doped ZnO (AZO) and Mg–doped ZnO (MZO) thin films onto glass substrates. Structural properties and surface morphologies of as–prepared films were characterised by X–ray diffraction (XRD) and scanning electron microscope (SEM) while their optical properties were scrutinised from ...

Analysis of a complex produced in the Fenton oxidation process

by IWA Publishing  (Mar. 13, 2014)

The absorbances of different concentrations of Fe2+, Fe3+ and H2O2 were investigated by UV-visible spectrophotometry without separating the substances. The law of complex formation was studied by considering changes in the UV-vis spectra of mixtures of these three substances. The results show that upon eliminating the influence of ...

Water and environmental analysis according to US EPA regulations using the lambda 25/35/45 UV/Vis spectrophotometers

by PerkinElmer, Inc.  (Oct. 28, 2011)

UV/Vis spectroscopy is an important analytical technique used for the determination of many water constituents. Environmental regulations in many countries prescribe the use of UV/Vis spectroscopy. Depending on the method, UV/Vis determinations of metal and organic nonmetal analytes in water have a minimum detectability in the ppb-ppm range. The ...

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