uv/vis Articles

76 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 ...

Determination of formaldehyde content in toys using UV/Vis Spectrometry

by PerkinElmer, Inc.  (Oct. 28, 2009)

As product safety regulations for industry are becoming stricter, more testing at lower levels is required for toxic elements or hazardous organic chemicals such as formaldehyde in children’s toys/clothing. Formaldehyde resins are used in fabrics to bind pigments to the cloth, as a fire retardant and to provide stiffness. In cotton and cottonblend ...

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 ...

Determination of hexavalent chromium in toys by using UV/Vis Spectrometry

by PerkinElmer, Inc.  (Oct. 28, 2009)

Toy safety is a joint responsibility among governments, the toy industries, regulatory bodies and parents. The toy safety regulations are intended to reduce potential risks children could be exposed to when playing with toys. Enforcement of the regulations aims to identify those toys that do not comply with the legislation and remove them from the ...

The structure and origin of dissolved organic matter studied by UV-vis spectroscopy and fluorescence spectroscopy in lake in arid and semi-arid region

by IWA Publishing  (Mar. 1, 2011)

To develop a proper indicator which could predict water quality and trace pollution sources is critically important for the management of sustainable aquatic ecosystem. In our study, seven water samples collected from Wuliangsuhai Lake in Inner Mongolia were used. UV-visible spectra and synchronous fluorescence spectra were applied to investigate ...

A real-time control strategy for separation of highly polluted storm water based on UV–Vis online measurements – from theory to operation

by IWA Publishing  (Jan. 1, 2011)

‘Classical’ real-time control (RTC) strategies in sewer systems are based on water level and flow measurements with the goal of activation of retention volume. The control system rule of ‘clean (storm water) runoff into the receiving water – polluted runoff into the treatment plant’ has been thwarted by rough operating conditions and lack of ...

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 ...

Evaluation of an On-Line UV/VIS Spectrophotometer and On-Line Luminescent Bacteria Monitor for Water Security Applications

by microLAN On-line Biomonitoring Systems  (Sep. 10, 2006)

Background: In 2004 RIVM and Kiwa Water Research performed desktop study on ‘Early Warning Systems’ in the drinking water supply 1. prioritisation of threat agents was performed2. overview of available online monitoring systems was prepared3. matching techniques with threats, five systems were shortlisted for testing with live agents Only rapid ...

Photodegradation of Pb-3,4-dihydroxybenzoic acid complex under UV light illumination

by IWA Publishing  (Feb. 1, 2012)

The degradation of 3,4-dihydroxybenzoic acid (3,4-DHBA) in the presence and absence of Pb2+ under UV illumination was studied. Addition of Pb2+ caused the formation of precipitate during photoreaction when the solution pH was higher than 6. The presence of Pb2+ remarkably inhibited the degradation of 3,4-DHBA and its photodegradation ...

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