Increasing the Congo Red concentration raised the amount
of immobilized dye on the membrane, as shown in Fig. 3.
High loadings, however, resulted in unacceptably decreasing
the transmittance of the membrane. Hence, a concentration of 10−5 mol L−1 with a maximum absorbance of about 0.4 may
be considered as optimum. Slightly lower concentrations were
used, however, in some preparations.
Increasing the Congo Red concentration raised the amount
of immobilized dye on the membrane, as shown in Fig. 3.
High loadings, however, resulted in unacceptably decreasing
the transmittance of the membrane. Hence, a concentration of 10−5 mol L−1 with a maximum absorbance of about 0.4 may
be considered as optimum. Slightly lower concentrations were
used, however, in some preparations.
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