论文部分内容阅读
示波滴定至今主要用于常量或半微量分析。示波滴定终点指示技术能否在微量和痕量分析中发挥作用是一个需要探索的新课题。本文报道用零电流示波双电位指示技术与动力学分析相法相结合的方法测定微量还原性物质。 在反应BrO_3~_+5Br~-+6H~+=3Br_2+3H_2O中,Br_2的生成速率受动力学控制,在一定条件下d[Br_2]/dt=k。若生成的Br_2达某一特定浓度(终点可用某一方法指示)的时间为t_0,则当该溶液中存在能与Br_2快速反应而与KBrO_3的反应可忽略的还原剂时Br_2达到该浓度的时
Oscillometric titration is mainly used for constant or semi-trace analysis. Whether the end-point technique of oscillometric titration can play a role in trace and trace analysis is a new topic to be explored. This paper reports the determination of trace reducing substances by the combination of zero-current oscillographic bipotential-indicating technique and kinetic analysis phase method. In the reaction of BrO_3 ~ _ + 5Br ~ - + 6H ~ + = 3Br_2 + 3H_2O, the formation rate of Br_2 is controlled by the kinetics. Under certain conditions, d [Br_2] / dt = k. If the generated Br2 reaches a certain concentration (the endpoint can be indicated by a certain method) for time t_0, when there is a reducing agent capable of reacting rapidly with Br2 and negligible reaction with KBrO3 in the solution, when Br2 reaches the concentration