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New Small and Compact Potentiostat for Training and R&D


Ion Chromatography and Voltammetry to Determine Chromium(VI)


High levels of toxic chromium(VI) in environmental samples have recently stirred up public attention in the US to focus on the impact of industrial pollution on humans and the environment. With ion chromatography and voltammetry, Metrohm provides state-of-the-art analytical techniques as well as the required instrumentation to help authorities to get a better picture of the hazards to public health. With ion chromatography, chromium(VI) is detected with high sensitivity as a violet chromium- diphenylcarbazone complex at 540 nm after separation on a polyalcohol anion-exchange column and subsequent post-column derivatisation with 1,5-diphenylcarbazide. When using a 1000 µL sample loop, the chromate detection limit determined in compliance with DIN 32654 is less than 10 ng/L. For the fully automated determination of chromium(VI) Metrohm recommends the combination of a Professional IC with the 887 Professional UV/VIS Detector and the 886 Professional Reactor.


Alternatively, chromium(VI) can be determined by voltammetry on the 797 VA Computrace. Unlike spectroscopic methods, voltammetry is able to distinguish between different oxidation states of metal ions (speciation) as well as between free and bound metal ions. This provides important information regarding the bioavailability and toxicity of heavy metals. When analyzing drinking or ground water samples, voltammetry enables direct determination of the target analytes without prior sample preparation. If organic compounds are present in the sample they are reliably removed by UV photolysis within 60 minutes using the 705 UV Digester.


Circle no. 327


Metrohm is pleased to introduce the 910 PSTAT mini, a PC-controlled, small and compact potentiostat ideally suited for training and simple applications in R&D. The PSTAT software is simple and intuitive to use enabling the main electrochemical measuring techniques, i.e. cyclic voltammetry (CV), differential pulse voltammetry (DP), square wave voltammetry (SWV) and chronoamperometric detection (AD).


The 910 PSTAT is highly economical, as it uses cost- effective disposable sensors that can be used without any conditioning required. It’s simply plug-and-play. Each sensor contains the three electrodes needed: the carbon, gold or platinum working electrode, a silver reference electrode and a carbon auxiliary electrode on a ceramic substrate.


While the 910 PSTAT is ideal for demonstration experiments and practical courses in universities, users in electrochemical R&D will find it a cost- efficient tool for sensor development and the study of reaction kinetics as well as the reversibility of electrochemical reactions.


Circle no. 328


Precision – It’s all about the right people


Titration: tiamo™ 2.2 Software Available in 12 Different Languages!


“What is unique is that Metrohm completely understand the challenges I face and the receptiveness and speed with which they respond to my inquiries.”


Metrohm speaks your language: So far, tiamo™ 2.2, the latest version of the world’s leading software for titration, has been available in German and English.


Now, updates for another 10 languages are available.


The new language updates are available from the software centre on www.metrohm.com.


Installation of tiamo™ 2.2 is required before the language updates can be downloaded in the user’s system. The new languages are:


• Chinese • French • Italian • Japanese • Polish


• Portuguese • Russian • Slovak • Spanish • Traditional Chinese


Circle no. 329 Circle no. 330 Dr. Dileep Wakankar, Clariant India Ltd.


While scouting for a suitable method to determine chromium(V), Dr. Dileep Wakankar came across ion chromatog- raphy and Metrohm. Supported by the experts from Metrohm India Ltd., Dr. Wakankar was able to prove that the dyestuff in a batch of several thou- sand pairs of shoes did not contain chromium(V). An important result for Clariant – and the beginning of a long- lasting relationship with Metrohm.


Metrohm. People you can trust. testimonials.metrohm.com


LAB ASIA - MARCH/APRIL 2011 - ADVERTORIAL


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