this concept is supported by the fact that the effectiveness of salts in increasing 2-p-toluidinonaphthalene-6-sulphonate fluorescence is as predicted by classical electrical double layer theory : governed mainly by the charge carried by the cation with an order of effectiveness c3+ greater than c2+ greater than c+ , and not by the chemical nature of the cation or by the nature of its co-ion .
C0007447
cation
C0022023
ion