22 Automated Thermometric Titrimetry
Minimum operator involvement and high analytical productivity – these are key benefits of automated thermometric titration. The method is ideal for monitoring the quality of fats and oils, namely to determine crucial parameters such as free fatty acid content and iodine value.
Thermometric titration means that there is no electrical contact with titrating solutions, so samples can be titrated in a totally non-aqueous environment. The endpoint is determined automatically, not prone to operator bias and can be detected in highly colored or turbid solutions, or even in media containing suspended solids. Moreover, the thermometric sensing probe requires no maintenance, special preparation, regeneration or calibration and can be stored dry between titrations.
Two determinations common in the analysis of fats and oils illustrate the versatility of the technique, namely the free fatty acid content and the iodine value. In both analyses, excellent agreement can be achieved with results obtained by official methods of analysis. The titrations are very fast, typically less than a minute in duration and can be easily automated by using a sample changer. Application Notes with the details on the determination of free fatty acid content and iodine value in vegetable fats and oils can be downloaded from the Metrohm webpage.
Circle no. 49 Informatics System Includes New Tool for Spectral Interpretation
Bio-Rad's KnowItAll Informatics System is a fully integrated software and database package that provides scientific researchers multiple tools, including database building and management, search, analysis, structure drawing, and reporting all within a single user interface. Bio-Rad offers specialised editions of its KnowItAll system specifically customised for spectroscopy and other areas of research. The latest KnowItAll release highlights a major addition to the AnalyzeIt˙ IR spectral interpretation application. AnalyzeIt IR helps chemists interpret spectra by generating a list of all functional groups possible at specific peak positions in a spectrum. With this release, users can now link to additional reference information for each functional group in the Sadtler Handbook of Reference Spectra - IR.
This release also includes a series of new report templates for more efficient output and improved design and a function to preview spectra and chromatograms to be used for searching, interpretation, or database creation before the file is actually opened. "We continue to expand our spectral reference databases by addressing application areas and analytical techniques of interest to our customers," said Gregory M. Banik, Ph.D, General Manager, Bio-Rad Informatics. "The combination of this ever-growing data collection with increasingly advanced yet easy-to-use software tools brings the analysis of spectral samples to a new level, turning data into solutions."
Circle no. 50 Certified Standards for ICP Spectroscopy
Horiba Scientific is proud to present the Précis line of certified standards dedicated to ICP-AES and AAS. These high quality standards feature extended expiration dates and are a reasonably priced alternative to others available today. Précis standards are offered as both single and multi-element at a concentration of 1000 µg/ml. Each standard comes with a Certificate of Analysis. This official document lists impurities measured via ICP-AES with the uncertainty of measurement.
Specific multi-element standards for ICP analysis are available which correspond to environmental protocol calibration, QC verification, interference checks, and instrument control and diagnostics. These solutions are available in 100 or 500ml bottles.
Circle no. 51
CHROMATOGRAPHY & SPECTROSCOPY
Innovative Microspectroscopy Solutions
Andor Technology PLC announced its new flexible range of microspectroscopy solutions. Combined with Andor’s world-leading CCD, ICCD and EMCCD cameras and spectrographs, the modular microspectroscopy set-ups allow a unique combination of ultra-fast yet highly sensitive microscopy imaging and spectroscopy.
One of the key enabling components is the Andor Shamrock spectrograph wide-aperture slit which opens new doors to a flexible and modular approach to microspectroscopy. Only one detection setup with a single camera is required to image samples whilst allowing spectral information collection through the same optical path from a microscope.
This new modular range is especially performing with Andor’s fast and extremely sensitive Newton and iXon+ EMCCD cameras, allowing weak Raman or Photoluminescence signal collection, down to single photon sensitivity.
This Andor solution offers the unique benefits of an all-in-one imaging and spectroscopy setup, including C-mount interfacing to all major microscopes, seamless kinematic mounting of a wide range of accessories and endless configurations with dedicated ThorlabsTM cage systems interfaces.
Dr Andrew Dennis, Director of Product Management within Andor Technology, said: "The increasing demand amongst the Research community for adding spectral analysis to microscopy imaging of bio-samples, has led us to combine our highly sensitive and high performing cameras and spectroscopes with market-leading microscopes.”
He added: “Scientists can now rely on our innovation of the past decade to make their research efforts even more productive and greatly increase the analytical power of their detection set-ups.”
Circle no. 52
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INTERNATIONAL LABMATE - APRIL/MAY 2010 - CHROMATOGRAPHY & SPECTROSCOPY
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