uv/vis Articles

77 Results found
  • Keyword: uv/vis ×

L Series Split Beam UV-VIS Spectrophotometer

The L series of spectrophotometers adopt proportion double beam survey optical system, and blazed holographic gratings. They have outstanding test precision and very competitive prices. ...

Heterogeneous photocatalytic degradation of 4-nitrophenol by visible light responsive TiO2-polyaniline nanocomposites

by IWA Publishing  (Jan. 23, 2015)

Different compositions of TiO2-polyaniline composites were prepared via chemical oxidative polymerisation of aniline over TiO2 nanoparticles followed by hydrothermal treatment. The prepared composites were characterised by various physicochemical techniques. From UV-VIS digital replay system (DRS) analysis, the shifts of the absorption maximum ...

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

by B&W Tek, Inc  (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 ...

Influence of local calibration on the quality of online wet weather discharge monitoring: feedback from five international case studies

by IWA Publishing  (Jan. 21, 2015)

This paper reports about experiences gathered from five online monitoring campaigns in the sewer systems of Berlin (Germany), Graz (Austria), Lyon (France) and Bogota (Colombia) using ultraviolet–visible (UV–VIS) spectrometers and turbidimeters. Online probes are useful for the measurement of highly dynamic processes, e.g. combined ...

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 ...

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 ...

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 ...

A pump-less discrete opto-fluidic chemical spectrophotometry system (DOCSS) for online in situ monitoring of dissolved contaminants in aqueous media

by IWA Publishing  (Nov. 6, 2014)

This paper presents the fabrication of a discrete chemical analyzer system for online monitoring of dissolved ions in water using UV-VIS absorption spectrophotometry. The device is composed of three main components: fluidic, optical, and control. The test cell was designed to also function as a non-invasive volume sensor, and the volume sensing ...

Need help finding the right suppliers?

Let the XPRTs do the work for you