IGCAR : Annual Report - Indira Gandhi Centre for Atomic Research

IGC
Annual Report 2007
derivation of parameter values
using the pre-established
calibration relationships, (iii)
real time graphic display of
volume dispensed and progress
of reaction in time domain till
termination, (iv) unfolding of
data in volume domain at the
close, and (v) display of the
titration plot with numerically
fitted regions before and after
the end point which is
automatically derived from the
intersections
for
conductometric titrations, or
display of titration plot with first
derivative for locating the end
point for potentiometric and pH
titrations . A reservoir of
titrating solution is placed
above with another solenoid
valve which automatically
opens at the beginning of the
next titration to fill the aqueous
solution in the left arm up to a
preset level before
commencement of the fresh
titration. The unit has also a
built in feature for protection
against drainage and overflow
of liquid.
screen captures are the titration
plots for a typical REDOX and a
pH titration respectively.
Any titration can be
completed with generation of
reportable data in less than five
minutes with this intelligent
unit, and it is ready for next
titration with the same titrating
solution immediately. Thus it
makes the job of repetitive
analysis easy with minimum
strain on the operator. The unit
can also be used in batch mode
for assay of different chemicals
when each batch is specific for
a given chemical species. It
takes maximum of about half
an hour for setting up the same
unit for titrations requiring a
different titrating agent for a
different batch, permitting
multiple chemical species assay
with one unit only, if necessary.
However, when the need for
analysis is too frequent and
urgent for a given chemical
species, such a unit can be a
dedicated one for that
particular requirement.
Partial screen views of three
typical titrations carried out
with this laboratory set up are
shown together in Fig. 2. The
first one is for determination of
chloride in service water by
conductometric titration
following the precipitation
reaction with dilute AgNO 3
solution. The second and third
Fig.2 Typical examples of displayed titration plots for different titrations
in dilute solutions: I. Cl - Vs. A g NO 3 by conductometric titration;
II. Fe +2 vs. Ce +4 by potentiometric titration; and III. An
acid-base reaction by pH titration.
ENABLING TECHNOLOGIES 139