Product category:
Liquid Analysis: Titration, HPLC, IC
News Release from: Metrohm UK | Subject: 797 VA Computrace Voltammetry
Edited by the Processingtalk Editorial
Team on 05 March 2004
Trace metal analysis using Voltammetry
The 797 VA Computrace is a modern voltammetric measuring instrument that connects to a PC directly via an USB connection: Windows XP based PC software controls all measurement and records
The 797 VA Computrace is a modern voltammetric measuring instrument that connects to a PC directly via an USB connection The intuitive Windows XP based PC software controls the measurement, records the measuring data and allows full evaluation of the recorded information
This article was originally published on Processingtalk on 2 Jul 2008 at 8.00am (UK)
Related stories
Tighter process control in acid pickling baths
Online ion chromatography from Metrohm has enabled tighter process control of acid pickling baths, as the final cleaning stage prior to metal plating
The determination of acidity in soft drinks
Sparkling drinks are the main cause of increasing tooth erosion among teenagers: a study in the British Dental Journal found a strong link between fizzy drink consumption and tooth erosion
The software comes with over 220 methods pre-installed for quick, convenient analysis of heavy metals.
The 797 VA Computrace offers.
Low capital outlay.
Further reading
The new Metrohm 856 conductivity module
The 856 Conductivity Module introduces the new 5-ring conductivity sensors which are far superior to the classical conductivity sensor
pH measurement of ethanol using the Aquatrode Plus
Investigations into the use of the Metrohm Aquatrode Plus electrodes for ethanol pH measurements according to ASTM D 6423 - the pH value is an important quality criterion for bioethanol
Low running cost.
Part per billion limits of detection for most metal ions.
Speciation studies eg Cr6+.
Portability.
Trace metal analyses can be performed with better sensitivity for the fraction of the cost of acquiring an AAS or ICP instrument.
The low running costs are an additional bonus point for voltammetry requiring no expensive combustible gases or reconstruction of the laboratory infra-structure to accommodate specialist ducting and fume hoods.
Apart from the small amounts of reagents required for the analysis, only small volumes of pure nitrogen are required.
797 VA Computrace principle features include.
Automation option with autosamplers and Dosino dispensing instruments.
Calibration using standard addition to take the sample matrix into consideration.
Detection limits in the ppb range.
Two operational modes - Quantitative and Qualitative with many different measuring modes eg CV,CVS, DP, AC,DC, NP,SQW, and PSA.
Spectroscopic methods can only determine the total concentrations of metals but with voltammetry it is additionally possible to differentiate between the various oxidation states of metal.
This allows statements to be made about the biological availability and toxicity of heavy metals and makes the technique an essential element in environmental analysis.
Samples matrices with high ionic concentrations are not a problem for voltammetry meaning that voltammetry is ideal for trace metal analysis in the following matrices.
Water, wastewater and sea water.
Salts and pure chemicals.
Electroplating baths.
Foodstuffs.
Quality assurance is not a problem with the 797 VA Computrace and some of these features include.
Freely definable access rights for each user permitting user management.
GLP wizard that allows the validation intervals of the analysis system to be defined.
Built in diagnosis programs and electrode tests.
Voltammetry as an instrumental method can be used as an alternative to AAS or ICP and many institutions use VA, to compliment their spectroscopic techniques, to provide a complete quantitative solution across a diverse range of sample matrices.
Voltammetry is now an accepted technique and numerous standards that describe voltammetric methods for the determination of trace metals include ISO, EPA and DIN methods. Request a free brochure from Metrohm UK ...
• Metrohm UK: contact details and other news
• Email this article to a colleague
• Register for the free Processingtalk email newsletter
• Processingtalk Home Page
Search the Pro-Talk network of sites
