Mn(Ⅱ)-OP-5-Br-PADAP分光光度法研究

THE CALORIMETRY AND POTENTIAL STUDY OF CHEMICAL OSCILLATING REACTION

研究了在ｐＨ９．４的硼砂介质中，Ｍｎ（Ⅱ）－ＯＰ－５－Ｂｒ－ＰＡＤＡＰ红色络合物形成的适宜条件和络合物的稳定性等．锰含量在（０～１）ｍｇ／Ｌ范围内服从Ｂｅｅｒ定律．其回归方程为：Ａ＝０．０５９９２Ｃ＋３．４×１０－２，（ｒ＝０．９９８６）．摩尔吸光系数ε＝１．０６×１０５．测定６次相对偏差小于３．０％．加标回收率在９６％～９８％．该法用于茶叶中锰的测定，结果令人满意．

The calormetric and potential oscillating curves of classic B Z reaction [KBrO 3 Malonic Acid(MA) H 2SO 4 Ce(NO 3) 3] are determined simultaneously in a self assemble device.The experimental curves showed that a endothermal and exothermal process occured in turn accompaning with the periodic changes of [Ce 4+ ]/[Ce 3+ ].This result is in agreement with the theoretic analysis based on FKN mechanism.The endothermal effect is chiefly concerned with dissociation of Br 2O 4 into BrO 2 radical and the exothermal effect,with the bromization of MA and the oxidization of BrMA or HOMA.