8
equip
| vwr.com | 1.800.932.5000
Formore informationon specificationsand
accessories, simplyenter theCat.No. on
vwr.com.
ELECTROCHEMISTRY
TitrationTheoryandPractice
operatorandof the reactionbeing
usedduring the titration
• Correctmeasurementof the
electrode signal regardlessof the
methodemployed
• Reliableand reproducible
mathematical treatmentof the
titrationcurves, stored in thememory
of the titratoras couplesofpotential
or currentmeasuredagainst volume
of titrant, leads to the securityof
the result
• Secure transmissionof thefinal results
and rawdata for future followup
as required
Amodernautomated titrator isnot just
simplyan instrument for realizingany
titration. It isan indispensable tool for
analytical laboratories concernedwith
thequalityof traceabilityand recording
of results thatneed toworkaccording
to the rulesofGoodLaboratory
Practice (GLP).
To read the full articlevisit vwr.com/hach
Inmostmanufacturingorprocessing
industries, it is essential toknow the
exact concentrationof aproduct,
speciesor chemical function inorder to
ensure theefficiencyof aprocessor the
qualityof afinishedproduct. This is
achievedby:
Findinga characteristicof theproduct
directly related to its concentration. The
analystuses eitherphysical (colorimetry,
UV IR spectrophotometry, flame
spectrophotometry, atomicabsorption,
etc.) or electrochemicalmethods like
polarography. Thesemethods areoften
longand costly, and requirededicated
instruments and skilledoperators.
Dissolving theanalyteandmaking it
reactwithanother species in solution
(titrant)
of known concentration. This is
what is knownas titrationand it canbe
performedmanuallyor automatically.A
titrationmademanually, even ifusing
thepossibilitiesof electrochemical
methods todetect theequivalence
points, poses a certainnumberof
difficulties for theoperator,
which canbe time consuming
to solve.Among the limitations
ofmanual titration, themost
difficult toovercomeare:
• Difficulty in interpretinga
curvemadepointbypoint
thatdescribesoneormore
poorlydefined inflection
points
• Irreproducibilityof results
thatdependon factors
that cannotbe
controlled
• Riskofhuman
transcriptionerrors
Anautomated titrator
isable to relieve the
operatorofall repetitiveand
fastidious tasks, inparticular:
• Controlof the titrantperfectly
adapted to the requirementsof the
