Articles
Exploding the myths: an update on UV-visible spectrometry
Christopher Burgess
Burgess Analytical Consultancy Limited, “Rose Rae”, The Lendings, Startforth, Barnard Castle, Co. Durham, DL 12 9AB, UK
John Hammond
Starna Scientific Ltd, 52–54 Fowler Road, Hainault Business Park, Hainault, Essex, IG6 3UT, UK/p>
Standards for the 21st century; establishing trust in measurement
As the column title rightly suggests Quality does Matter. The authors look at the major changes that have taken place over the last 50 years in four key areas: The National Metrology Institutes (NMIs), the instrument manufacturers, the user base and the globalisation of regulation through international regulatory bodies.
Combined infrared and visible spectroscopic ellipsometry study of thin polymer layers
Thin polymer layers on solid substrates are of high technological importance due to their increasing potential for applications in electronics, sensors, nanotechnology and biotechnology. Appropriate characterisation methods are necessary for the design and analysis of devices made using such materials. This review article focuses upon presenting the many analytical possibilities for quantitative evaluation of the optical constants and thickness of polymer layers by combined application of spectroscopic ellipsometry (SE) in the visible (vis) and infrared (IR) spectral range.
UV/vis reflectance spectroscopy reveals the changes in fibre chemistry during ageing
UV/vis reflection spectroscopy is a practical method to investigate pulp ageing, especially when reflectance spectra are converted to absorbance (k/s) spectra. Even if detailed reaction paths cannot be solved with this technique alone, it provides a very fast and simple method to study the changes in the concentrations of certain important pulp components during ageing. In addition, the concentrations of these components have been studied also in other pulp processes, such as mechanical and chemical pulp bleaching.
Real-time detection of possible harmful events using UV/vis spectrometry
G. Langergraber,a J. van den Broeke,b,* W. Lettlb and A. Weingartnerb
aInstitute for Sanitary Engineering and Water Pollution Control, BOKU - University of Natural Resources and Applied Life Sciences, Vienna, Muthgasse 18, A-1190 Vienna, Austria. E-mail: [email protected]
On-line and in situ UV/vis spectroscopy for multi-parameter measurements: a brief review
As the first compact on-line instruments for use in the field have been on the market for several years, this article reviews their capabilities and applications.
Traceable certified reference materials (CRMs) in far-ultraviolet spectrophotometry
John P. Hammond
Analytical Products, Optiglass Ltd, Hainult, Essex, UK. E-mail: [email protected]
Vacuum-UV chemical physics in the gas phase using synchrotron radiation
This article highlights four areas of research where the use of tunable synchrotron radiation radiation in the vacuum-UV has led to important discoveries. These studies have exploited the tunability of such sources, albeit at moderate resolution.
Study of the evolution of colour during the maceration process of cherries in liquor: an application of visible spectroscopy
Gabriel Pinto and Isabel Paz
Departamento de Ingeniería Química Industrial y del Medio Ambiente, E.T.S.I. Industriales, Universidad Politécnica de Madrid, José Gutiérrez Abascal 2, 28006 Madrid, Spain
Port wine spectral monitoring
Luis Oliveira and Manuel Pais Clemente
CETO – Centro de Ciências e Tecnologias Ópticas, Rua Caldas Xavier, Nº38, 6º E, 4150 Porto, Portugal. E-mail: [email protected]
New certified reference materials for the determination of photometric accuracy in UV spectrophotometry
This article discusses the development of new Certified Reference Materials (CRMs) for use in determining the essential accuracy and linearity of the Transmission scale of a conventional UV/vis spectrophotometer.