Conductivity of highly concentrated solution of reactive dye

Measurement of the conductivity of reactive dye solutions investigated their state and conglomeration in solutions,including the impact of dye concentration,medium temperature,and additives on the conductivity of dye solutions as well as the rule of influence.The results showed that the conductivity of reactive dye solution was directly proportional to the dye concentration and medium temperature.There existed certain critical ranges with respect to the change of conductivity of the tested dyes when the concentration range of dye solution was 30-40 mmol/L and the temperature was about50 ℃.The change rate of conductivity was different in front of or behind the range,and raising the temperature was conductive to the dye disaggregation.Adding sodium sulfate to Reactive Orange 13 solution with a mass concentration of 40 mmol/L aggravates the aggregation of dye due to the common ion effect.However,the ionigation of the dye increased when the concentration of sodium sulfate was less than 3 g/L.Anionic surfactant SDBS has significant effect on improving the stability of Reactive Orange 13 solution at 50 ℃.