Abstract
In this paper, apparent equivalent conductivities of Benzopurpurine 4B (C. I. Direct Red 2) and Direct Sky Blue 6B (C. I. Direct Blue 1) in presence of nonionic surface active agent (polyethylene glycol cetyl ether), anionic surface active agent (sodium lauryl sulfate), and sodium chloride are obtained respectively.
Apparent equivalent conductivities (Λa) are calculated from the following equation; where, KM is specific conductivity of dye solution in presence of surface active agent or sodium chloride, and KN the specific conductivity of surface active agent or sodium chloride solution in which dye is not contained, C the equivalent concentration of dye, Λa the same value as equivalent conductivity of dye in pure water where no dye interacts with surface active agent or sodium chloride.
As McBain effects are observed in equivalent conductivity_??_√c graphs of both Benzopurpurine and Sky Blue solutions, it is considered that dye ionic micells are formed in dye solutions.
The values of Λa of Benzopurpurine and Sky Blue are found to decrease in presence of PEG-cetyl ether as apparent concentration of dye decreases due to formation of complex with PEG-cetyl ether.
And, the values of Λa of Benzopurpurine and Sky Blue are found to decrease in presence of sodium lauryl sulfate and sodium chloride.
