application 1 voltammetric trace analysis analysis of heavy metals total concentration for a fraction of the purchase price of an aas or icp instrument it is possible to carry out metal analyses with the same or improved sensitivity the only thing required apart from small amounts of reagents is a small amount of pure nitrogen no expensive flammable gases no specially constructed fume hoods in the laboratory no costly metal vapor lamps and speciation spectroscopic methods can only determine the total concentration of the metals with voltammetry it is additionally possible to differentiate between various oxidation states of metal ions or between free and bound metal ions this allows statements to be made about the biological availability and toxicity of heavy metals and makes this technique an essential element in environmental analysis with spectroscopy it is only possible to make comparable statements after the complicated separation of the metal species high ionic concentrat
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application 2 cvs for the determination of organic additives in electroplating baths cyclic voltammetric stripping analysis cvs and cyclic pulse voltammetric stripping analysis cpvs are widespread methods in the electroplating industry for the determination of organic additives in electroplating baths for many technical coatings particularly in the manufacture of pcbs and semiconductor components this method forms an essential part of production control the quantitative determination of the additive is carried out indirectly via its influence on the deposition of the main components of the electroplating bath as the measurement is based on an electrode reaction that corresponds to the production process the activity of the additive and thus its effectiveness in the galvanization process can be measured directly the most important fields of application for the method are · acidic copper baths · tin-lead baths and tin baths · alkaline zinc baths quantification of the various types of a
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application 3 797 va computrace as a training tool exploratory is the program part of the 797 va computrace specially designed for training purposes it is characterized by its extremely clear layout and intuitive operation the experimental parameters and the associated voltammograms can be seen at a single glance its user interface means that the instrument is ideal for practice-oriented voltammetry training in universities technical colleges vocational schools and production facilities in the exploratory mode the following current measuring techniques are available sampled dc dp sqw ac cv np psa ccpsa cvs cpvs direct current differential pulse square wave according to osteryoung alternating current 1st and 2nd harmonic phase-selective cyclic voltammetry normal pulse potentiometric stripping analysis stripping chronopotentiometry with chemical oxidation constant current potentiometric stripping analysis stripping chronopotentiometry with oxidation/reduction by constant current cyclic
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these possibilities mean that this program part is highly useful in developing and optimizing methods for the quantitative determination of substances the optimized voltammetric parameters can be accepted directly in the determination method in the program part determination transfer from determination to exploratory is also possible the shown curves can also be exported to other programs e.g spreadsheet programs via the windows clipboard the curves can also be stored as a file and the list of measuring points can be exported in ascii format practical voltammetry metrohm offers the two monographs «practical voltammetry» and «introduction to polarography and voltammetry» for the use of the 797 va computrace in vocational training the «introduction to polarography and voltammetry» is presented in compact form on less than 60 pages the most important current measuring techniques and the different working methods used in polarography and stripping voltammetry are explained the monograph «p
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automatic addition of auxiliary solutions with 800 dosinos the voltammetric determination takes place by standard addition or calibration curve und and can be carried out automatically if 800 dosinos are used connections are available for a maximum of three 800 dosinos of course all other auxiliary solutions such as buffers or complexing agents can also be added automatically fully automatic analysis of small series of samples with the 813 compact autosampler the 813 compact autosampler enables fully automatic trace analyses it is suitable for the precise and reproducible investigation of several samples the sample rack accommodates a maximum of 18 samples the built-in peristaltic pump of the 813 compact autosampler transfers them from the turntable into the measuring cell of the 797 va computrace where they are analyzed 838 advanced va sample processor fully automated cvs analysis in combination with the 838 advanced va sample processor it is possible to carry out fully automated de
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mva metrohm va systems complete voltammetry systems the right system for each application the mva systems are ready-to-use complete packages custom-made to suit particular applications all you have to do is connect your package to a pc and off you go each mva system is supplied with all the necessary accessories mva accessory kits extend the possibilities of the mva basic system to suit special applications mva systems for voltammetric trace analysis mva-2 partly automated routine trace analysis automatic addition of auxiliary solutions mva-2 is an easy-to-use va system for the routine analysis of traces of heavy metals in environmentally relevant samples or in production control just add the sample to the measuring cell from a pipet and start the analysis the rest of the determination takes place automatically this system is intended for users who require elegant and comfortable operation at an attractive price without having to use a sample changer mva-3 fully automatic analy
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quality assurance no problem with the 797 va computrace rights of access to each program part can be freely defined for each user this permits comfortable user management validation with the glp wizard the software automatically checks the validation intervals of the analysis system and informs the user each report shows whether the validation is still valid the glp wizard guides the user stepby-step through the various validation tests and automatically evaluates their validity diagnosis the built-in diagnosis program allows the individual components of the instrument to be checked this diagnosis is a part of the glp wizard but it can also be carried out on its own electrode test the electrodes used are automatically checked before each determination if problems occur then the faulty electrode is identified and the fault shown on the screen this test can of course be triggered manually to check the system curve evaluation the software of the 797 va computrace automatically evaluates
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standards numerous standards describe voltammetric methods for the determination of traces of metal and organic compounds a small selection is given below iso 713 iso 3856-4 zinc determination of lead and cadmium contents polarographic method paints and varnishes determination of «soluble» metal content part 4 determination of cadmium content flame atomic absorption spectrometric method and polarographic method fruits vegetables and derived products determination of zinc content part 1 polarographic method arsenic in aqueous samples and extracts by anodic stripping voltammetry asv mercury in aqueous samples and extracts by anodic stripping voltammetry asv crvi in water by polarography standard test methods for cadmium in water standard test methods for lead in water fumaric acid in food polarographic method lead in fish polarographic method bismuth compounds in drugs lead in evaporated milk and fruit juice determination of 7 metals by voltammetric methods zn cd pb cu tl ni co water
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technical specifications 797 va computrace materials voltammetric measuring stand with built-in potentiostat and galvanostat housing polyurethane hard foam pur with flame protection for fire class ul94vo cfc-free base plate and measuring head arm metal stove-enameled 6.1246.020 multi-mode electrode mme pneumatically operated as dme hmde or smde requires mercury 99.9999 and nitrogen 99.999 whose pressure must be reduced with a reduction valve to 1.0 ±0.2 bar 100 ±20 kpa rotating disk electrodes rde with exchangeable electrode tips made from various materials «ultra trace» graphite glassy carbon gold silver platinum 6.0728.020 ag/agcl/kcl 3 mol/l with 6.1245.010 electrolyte vessel 6.0343.000 platinum auxiliary electrode with plastic shaft 6.1241.020 6.1247.000 glassy carbon auxiliary electrode option speed speed stability material 200 bis 3000 min1 ±5 pet working electrodes reference electrode auxiliary electrodes stirrer measuring cell working volume 10 70 ml 50 150 ml option 5 ml
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accessories for rotating disk electrodes rde 6.5327.000 mva-hg accessory kit for the determination of mercury for 2.797.0010 2.797.0020 and 2.797.0030 complete equipment with gold rde ag/agcl reference electrode glassy carbon auxiliary electrode measuring cell mva-as accessory kit for the determination of arsenic for 2.797.0010 2.797.0020 and 2.797.0030 complete equipment with side-mounted gold rde ag/agcl reference electrode glassy carbon auxiliary electrode measuring cell mva-cvs accessory kit for the determination of additives in electroplating baths by cvs cyclic voltammetric stripping for 2.797.0010 and 2.797.0020 complete equipment with platinum rde 6.1204.160 ag/agcl reference electrode platinum auxiliary electrode measuring cell electrode tips for rotating disk electrode rde the shaft of the rde tips consists of peek polyetheretherketone the following applies to all the rde tips listed below shaft diameter 7 mm diameter of the active zone 2.0 ±0.1 mm exceptions diameter of the
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i onanalysis metrohm ltd ch-9101 herisau/switzerland phone +41 71 353 85 85 fax +41 71 353 89 01 www.metrohm.com info@metrohm.com subject to modifications layout by ecknauer+schoch asw printed in switzerland by metrohm ltd herisau 8.797.6013 2005-01
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