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Metrohm Info 2003-2

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Contents797 VA Computrace the all-round instrument for voltammetry .............................................................3 Titropackage provides economical access to automated titration .......................................................10 MATi the customer-specific system solution in titration.....................................................................13 The Titrando system has been successfully audited......14 Wine PAC know-how package for the titrimetric/ potentiometric analysis of wine and must .....................15 New in our electrode range: the 6.0150.100 separate pH glass electrode.................17 Alterations in the reagents sector..................................17 The customer application: fully automatic water analyses at Ondeo Nalco Pte Ltd, Singapore .................19 New Metrohm Application Notes...................................21 New Metrohm publications...........................................23 Book corner .................................................................24 Literature references ....................................................26 The 2nd Conference on Ion Analysis in retrospect ..........28 Metrohm worldwide .....................................................29

EditorialMetrohm Ltd. CH-9101 Herisau Switzerland Phone Fax E-Mail Internet +41 71 353 85 85 +41 71 353 89 01 [email protected] www.metrohm.com Dear Readers, Special birthdays are there to give us time to reflect, to pause and think about things, to remember our experiences and, at the same time, to build up the necessary momentum to meet new challenges. Metrohm is 60 years old. In 1943 the founder of the company, Bertold Suhner who at an age of more than 70 obtained a doctorate with a scientific thesis started with the following basic principles: Stay totally independent of the banks. Keep a hold on the market and do not become a subcontractor to other companies. Use the most modern technology as a means to an end. Leave the profits in the company to finance its expansion. Employ no more than 50 people. Well, apart from the number of employees all these principles still apply today, 60 years later. They have secured Metrohm an important position on the world market. Metrohm has established itself in the hard-fought analytical instruments sector and has continually extended its position. We are the market leader in the fields of titration and voltammetry, in the ion chromatography sector we are a very strong number two with a high growth rate. Today Metrohm is active in more than 120 countries throughout the world, with subsidiaries or joint ventures in the 43 most important of them. We are involved in the major world markets, either directly or indirectly, in order to provide our customers with the greatest benefits. We have only infringed one of the basic principles: the size of the company. The success of our products and the demand for new instruments have resulted in the number of staff at our headquarters increasing to about 350. In the distribution companies mentioned above, in which Metrohm has a majority or strong minority participation, a total of more than 700 persons are employed. They are all active in the interests of the customer. We have particularly respected one of the basic principles: We are independent, have no indebtedness to banks, are not listed on the stock exchange and cannot be bought. Our resources are primarily concentrated on the continuous expansion of our product range, the further optimization of our analytical instruments and their production as well as on increasing our market penetration in order to provide our customers with the best possible support. This brings us to the future. We will stick to our basic principles, with the exception that our growth will continue, particularly on the market. Being large itself means nothing to us, it is only helpful in enabling us to supply a growing number of customers with products and services in an optimal way. This is why we wish to remain mobile in our headquarters, set up no bureaucracy and continue to employ about 30% of our staff in developing new and powerful analytical instruments that will either strengthen our position as market leader or, where we are not yet the market leader, enable us to reach this goal. Best regards, Metrohm Ltd.

ImprintMetrohm Information is a customer magazine from Metrohm Ltd. and is published three times a year in English and German. Please contact us if you wish to receive your own copy regularly. Published by: Metrohm Ltd., CH-9101 Herisau, Switzerland Editor: Printed by: Claudia Dengler [email protected] Metrohm Ltd.

Adrian Dteindre President & CEO Delegate of the Board of Directors

ISSN 1424-0904

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Metrohm Information Issue 2/2003

797 VA Computrace

797 VA Computrace the all-round instrument for voltammetry

The new 797 VA Computrace.

With the 797 VA Computrace Metrohm presents a completely new voltammetry instrument that opens up a novel field of application in addition to the classical voltammetric and polarographic analysis methods used for the determination of metal traces. The newly implemented Cyclic Voltammetric Stripping technique (CVS) allows the determination of organic additives in electroplating baths by means of cyclic voltammetry. In addition, 797 VA Computrace is also eminently suitable for use in research and teaching, particularly for practice-oriented training in electrochemistry and for analyses in applied research.

One instrument three application fields Stripping voltammetry Voltammetric trace analysis plus speciation of metal ions and other substances CVS Determination of organic additives in electroplating baths with Cyclic Voltammetric Stripping Exploratory The Metrohm concept for electrochemistry training

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797 VA Computrace The instrument797 VA Computrace is a modern voltammetric measuring stand that is connected to the PC via a USB port. The newly designed built-in potentiostat with galvanostat guarantees the highest degree of sensitivity with reduced noise. As working electrodes the unique Multi-Mode Electrode MME and rotating disk electrodes (RDE) made of various materials are available.

Measuring cell with Multi-Mode Electrode MME for the determination of metal traces.

Measuring cell with rotating platinum disk electrode for the analysis of electroplating baths.

The softwareThe 797 PC software controls the measurement, records the measuring data and evaluates them. The data can be archived using the Autodatabase software supplied with the instrument. Standard formats are available for printing out the results but you can also use the report generator to create individually designed analysis reports. The clear structure of the 797 PC software grants unparalleled ease of operation. Validation made easy with the GLP Wizard The software automatically checks the validation intervals of the analysis system and keeps the user informed. Each report shows whether the measurements were carried out within the validation interval. The GLP Wizard guides the user step by step through the different tests and automatically checks their validity.

Easy validation with the GLP Wizard.

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Metrohm Information Issue 2/2003

797 VA Computrace Application field 1 Voltammetric trace analysis

VA Computrace system with automatic standard addition for routine 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 even higher sensitivity. The only thing required apart from small quantities 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 voltammetry an essential method in environmental analysis. High ion concentrations? No problem with VA! Samples with high ion concentrations are no problem for voltammetry. This means that voltammetry is predestined for the analysis of: Water, waste water and sea water Salts and pure chemicals Electroplating baths Foodstuffs

Detection limits Antimony Arsenic Bismuth Cadmium Chromium Cobalt Copper Iron Lead Mercury Molybdenum Nickel Platinum Rhodium Selenium Thallium Tungsten Uranium Zinc 1 ppt = 1 ng/kg Sb(III)/Sb(V) As(III)/As(V) Bi Cd Cr(III)/Cr(VI) Co Cu Fe(II)/Fe(III) Pb Hg Mo(IV)/Mo(VI) Ni Pt Rh Se(IV)/Se(VI) Tl W U Zn 200 ppt 100 ppt 500 ppt 50 ppt 25 ppt 50 ppt 50 ppt 50 ppt 50 ppt 100 ppt 50 ppt 50 ppt 0.1 ppt 0.1 ppt 300 ppt 50 ppt 200 ppt 25 ppt 50 ppt

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797 VA ComputraceSpecific analysis of organic compounds Not only heavy metals, but many different organic compounds can also be determined by voltammetry. Examples of important applications: 4-Carboxybenzaldehyde in terephthalic acid Free styrene in polystyrene Vitamins in juices and vitamin preparations Determination of anions Some special anions can also be determined voltammetrically. Of particular interest is the analysis of the environmentally relevant species cyanide and sulfide or nitrite and nitrate.

Application field 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 or