uv/vis Articles

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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 ...

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 ...

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 ...

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 ...

Use of multivariate calibration models based on UV-Vis spectra for seawater quality monitoring in Tianjin Bohai Bay, China

by IWA Publishing  (May 18, 2015)

A series of ultraviolet-visible (UV-Vis) spectra from seawater samples collected from sites along the coastline of Tianjin Bohai Bay in China were subjected to multivariate partial least squares (PLS) regression analysis. Calibration models were developed for monitoring chemical oxygen demand (COD) and concentrations of total organic carbon ...

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 ...

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 ...

Combined SAXS/UV−vis/Raman as a diagnostic and structure resolving tool in materials and life sciences applications

by B&W Tek  (Jan. 31, 2014)

Abstract: In order to diagnose and fully correlate structural, chemical, and functional features of macromolecules and particles in solution, we propose the integration of spectroscopy and scattering on the same measuring volume and at the same time in a dedicated sample environment with multiple probes. Combined SAXS/UV−vis and SAXS/Raman ...

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 ...

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 ...

Photocatalytic reduction of Cr(VI) in a fully illuminated fluidized bed reactor

by IWA Publishing  (Dec. 1, 2011)

The potential of a fluidized bed reactor for the UV-A photocatalytic reduction of Cr(VI), a priority water pollutant, by utilizing a TiO2/quartz sand composite, was explored. The effects of oxalic acid (OA) as a sacrificial agent in the heterogeneous system was also investigated and compared with the homogeneous photoreduction by the same ...

Ferrate(VI): a novel oxidant for degradation of cationic surfactant – cetylpyridinium bromide

by IWA Publishing  (May 16, 2013)

Ferrate(VI) is an efficient multi-functional water treatment reagent that has several novel properties, such as strong oxidation, absorption, flocculation, disinfection and deodorization. The removal of cationic surfactants based on ferrate (K2FeO4) was performed in the case of cetylpyridinium bromide (CPB). The influence of operating ...

Ibuprofen removal from aqueous solution by in situ electrochemically generated ferrate(VI): proof-of-principle

by IWA Publishing  (Sep. 29, 2015)

The possibility of removing pharmaceuticals from aqueous solutions was examined using ibuprofen (Ibu) oxidation as an example, using in situ electrochemically synthesized ferrate(VI), a strong oxidant and coagulant, with forming of non-harmful byproducts. A solution of ibuprofen of 206 mg/L in 0.1 M phosphate buffer solution was treated with ...

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 ...

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 ...

Reduction of hexavalent chromium: photocatalysis and photochemistry and their application in wastewater remediation

by IWA Publishing  (Jul. 16, 2014)

Hexavalent chromium present in wastewater discharge of galvanic industries is toxic to most microorganisms and potentially harmful to human health. This work examines the photochemical reduction of Cr(VI) with ethanol under ultraviolet (UV) and visible radiation, and photocatalytic reduction of Cr(VI) with TiO2 in the presence of ethanol under ...

Removal of methylene blue from water by γ-MnO2

by IWA Publishing  (Jan. 1, 2011)

Methylene blue (MB) is a cationic dyestuff, which is particularly resistant to biodegradation. The molecular sieved γ-MnO2 was used as an adsorbent/oxidant to remove the MB at room temperature and in visible light. The removal efficiency was mainly evaluated by X-ray diffractometer (XRD), UV–Vis spectrometer (UV–Vis), total organic carbon (TOC). ...

On the use of non-negative matrix factorisation to characterise wastewater from dairy processing plants

by IWA Publishing  (Jan. 1, 2011)

A portable field spectrometer was used to record the time-resolved ultraviolet/visible (UV/Vis) spectrum of the effluent stream at two different dairy processing plants (a Drier Plant and Cheese Factory). The spectra exhibited significant variability. As an alternative to the partial least squares regression methods usually used in the online ...

Determination of Trace Lead, Poly-Phenols and Tannins in Wines Using a Single Analytical Instrument

by Buck Scientific Inc  (Jan. 1, 2006)

The manufacturing of wine and other fermented beverages has typically been a fairly simple process. Historically, the expertise of the sage wine-master was used to gauge the quality of the product. Today, many environmental concerns, health factors, and government rules, prompt the producers of fine wines to monitor several important ...

Identification of industrial wastewater by clustering wastewater treatment plant influent ultraviolet visible spectra

by IWA Publishing  (Mar. 1, 2011)

A procedure is proposed which allows the detection of industrial discharge events at the inlet of a wastewater treatment plant without the need for measurements performed at the industry, for special equipment and for exact knowledge of the industrial sewage. By performing UV/Vis measurements at the inlet of a plant and analyzing them with a ...

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