The kinetics study of the reduction of Fast Green dye with cetylpyridinum chloride as cationic surfactant

The kinetics of the reaction of Fast Green dye(FG)with cetylpyridinum chloride was studied in alkaline medium by UV-Visible spectrophotometer.Reduction of Fast Green dye was carried out by varying the fast green dye concentration,cetylpyridinum chloride concentration and concentration of sodium hydroxide.In the present study the reduction of dye was carried out in order to reduce the color content.The interaction of dye was carried out with reducing analyte(cetylpyridinum chloride).The rate of the reaction was determined by varying the above parameters at different temperatures.It was observed that the reduction followed pseudo first-order kinetics with respect to dye,surfactant,OH–ion concentration according to the following reaction pathway.reaction like entropy of activation(ΔS)and free energy of activation(ΔG)showed the extremely solvated states of transient complex which was less disorderly arranged than the oxidized form of dye,whereas Ea values reflects a high amount of energy required for the reduction of dye with cetylpyridinum chloride.

铋(Ⅲ)-间硝基偶氮氯膦-溴化十六烷基吡啶-Triton X-100-乙醇显色体系的研究及其应用

本文研究了铋(Ⅲ)—间硝基偶氮氯膦—溴化十六烷基吡啶—Triton X-100—乙醇显色体系的光度特性,并确定了该体系中以铋配合物进行测定的最佳条件。该体系与相应的二元体系相比,灵敏度、稳定性和选择性均有显著提高,据此提出了测定铋的新方法。用于铅基合成试样中铋的测定,结果满意。