抄録
The displacements of Orange II anion on silk by Cl-, Br-, and SCN- are investigated.
In this experiment, Orange II dyed silk is allowed to come to an equilibrium with 1.0×10-2mol/l HCl solutions containing inorganic electrolytes, NaX, such as NaCl, NaBr and NaSCN. The amounts of Orange II displaced from dyed silk in HCl solution containing NaCl, NaBr or NaSCN are the most in the solution NaCl containmg, and the least in the solution containing NaSCN at any temperature. Assuming that Orange II anion on the silk is only displaced by X- and Cl-, and at a given temperature the dye concentration displaced from the dyed silk by Cl- in solution containing other electrolyte is the same as the concentration displaced from the dyed silk in 1.0×10-2mol/l HCl solution in which no other electrolyte is contained, and the total basic sites for anion on the fiber do not vary at any temperature, the relative affinities on Orange II for silk are calculated.
The relative affinity of Orange II for silk in the solution containing NaCl is larger in kcal/mol of 0.6-1.0 and 2.2-2.5 than in the solution containing NaBr and NaSCN respectively. These mean that the order of affinities of inorganic anion for silk is as follow: SCN->Br->Cl-. The affinities of SCN- for silk is larger in kcal/mol of 1.3-1.7 and 2.2-2.5 than in Br- and Cl- respectively. The order of affinities of inorganic anions for silk in so far as these three anions are concerned is contrary to the Hofmeister series.
