Product category:
Materials Testing
News Release from: Metrohm UK | Subject: Titrating electrode
Edited by the Manufacturingtalk Editorial
Team on 01 June 2007
Electrode for titrating low conducting
samples
Methrohm UK has released the iAquatrode Plus, an intelligent electrode for titrating low conducting samples where conventional glass bulb electrodes are inefficient.
Methrohm UK has introduced the iAquatrode Plus, an intelligent electrode for low conducting samples where conventional glass bulb electrodes are inefficient These samples include weakly buffered solutions and low conductivity/low ionic strength solutions such as river water, process purified water and infusion solutions
This article was originally published on Manufacturingtalk on 22 May 2008 at 8.00am (UK)
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The low electrical conductivity causes a higher electrical resistance across the glass membrane which is also influenced more by electrical fields.
The low proton concentrations cause a very slow electrode response and as weakly buffered solutions are prone to CO2 uptake, the slow response will result in increased changes in pH due to the CO2 combined with the slow electrode response.
Streaming potentials, which may occur in measurements in flowing or stirred solutions (which occur when using electrodes with ceramic pin diaphragms), are negligible when using the Aquatrode Plus.
Further reading
Metrohm electrodes - free storage DVD offered
Metrohm UK advised that companies ordering a new Metrohm electrode now will receive a free storage and maintenance DVD - offer expires on March 31, 2008.
Analysing electroless nickel plating baths
Automated on-line analysis system performs all liquid handling steps such as taking sample aliquots, dosing of reagents, titration and cleaning.
Analyse electroless nickel plating baths at line
An 'at line' analyser uses uses well established hardware and software to analyse nickel, hypophosphite and alkalinity in electroless nickel plating baths.
These properties are particularly important for SET endpoint titrations to define a pH or potential value.
For example, ISO 9963-2 is a widely used method for the analysis of drinking water.
It is the determination of carbonate alkalinity by titrating to pH 5.4.
The Aquatrode plus has a fixed sleeve diaphragm which produces a steady signal that is almost independent of sample flow conditions.
Other benefits of iAquatrode Plus (and Aquatrode Plus).
1/ Membrane glass: has an ideal membrane resistance for low ionic strength solutions.
Thin hydrated layer on membrane to allow quick response time.
2/ Double-Junction: Maintenance free inner reference system.
Adjustable outer reference electrolyte for samples with low ionic strength (can use weaker solutions than 3M KCl).
3/ Electrically shielded: no electrostatic influence.
4/ Storage solution: Aquatrode Plus is delivered in Metrohm Storage Solution for optimum response.
The iAquatrode Plus is part of the family of iTrodes: electrodes with brains.
The electrode used for the titration is really the most important component of any titration system, and until now it has been just this electrode that has formed the last gap in traceability.
The 857 Titrando with iConnect now closes this gap and therefore guarantees complete traceability of the analytical result to each component participating in the analysis.
iConnect and iTrode prevent the use of an incorrect electrode and the use of an electrode whose calibration period or working life has expired.
The 854 iConnect is an electrode cable and measuring amplifier in one.
The iTrodes of the intelligent electrode generation confirm Metrohm's leadership in the field of potentiometric titration.
The built-in memory chip allows the storage of such important sensor data as article and serial numbers, calibration data, calibration history, working life and calibration validity period.
All the sensor data are read in automatically when the iTrode is connected to the 857 Titrando.
Mix-ups or editing errors are therefore eliminated.
The electrode is identified automatically.
If the type of electrode is not the same as that defined in the method then the user is informed.
This means that it is not possible to use an incorrect electrode.
Monitoring functions allow the exclusion of electrodes whose calibration data lie outside the limits or whose calibration period has already expired.
If the sensor is used with different instruments or if you wish to prevent inexperienced users from having to calibrate the electrode on their own instruments then the electrode can be calibrated on a different instrument under defined conditions.
The calibration data stored in the chip make the electrode transferable; it does not need to be recalibrated each time that it is used with a different instrument.
Despite its new digital measuring interface and intelligent sensors, the 857 Titrando with combined analog and digital measuring amplifier (2.857.0020) also supports conventional sensors.
This means that you can continue to use all your sensors.
iAquatrode Plus and other intelligent electrodes are available now from Metrohm UK.
iAquatrode Plus with Pt 1000 (plug K) 6.0277.300.
iUnitrode with Pt 1000 (plug K) 6.0278.300.
iSolvotrode (plug K) 6.0279.300.
iAg Titrode (plug K) 6.0470.300.
iPt Titrode (plug K) 6.0471.300.
Aquatrode Plus without Pt1000 6.0253.100.
Aquatrode Plus with Pt1000 6.0257.000. Request a free brochure from Metrohm UK ...
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