Chemistry Reference
In-Depth Information
This result shows clearly that the developed sensor system is useful in the
textile dyeing industry.
Finally, the long-term stability of the sensor system was tested during a
dyeing process where the concentrations of indigo and dithionite were con-
trolled at a fixed value of 1.0 ¥ 10
-3
and 4.0 ¥ 10
-3
mol l
-1
, respectively. Simul-
taneously, aliquots were taken from the bath solution and titrated according
to the established method. The results are shown in Fig. 6.19, and it can be
seen that the concentration of indigo and dithionite is constant in the bath
due to the good long-term stability of the sensor. A poor long-term stabil-
ity would have resulted in a shift of the concentration of these compounds,
which in turn would have resulted in a deviation between indigo and
dithionite concentration obtained by the sensor and by titration. This is not
the case.
6.8
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