氯溴碘连续电位滴定研究

STUDY ON SIMULTANEOUS POTENTIOMETRIC TITRATION OF CHLORIDE BROMIDE AND IODIDE

本文对Cl^-,Br^-,I离子的连续电位滴定进行了详细研究,着重解决了Cl^-,Br^-离子高摩尔比连测的难题。采用Gran作图法并严格控制操作条件,Cl^-,Br^-,I^-摩尔比从1:1:1至100:1:1均能准确测定。方法操作简单、快速、准确。

Simultaneous potentiometric titration of chloride, bromide and iodide is investigated in detail. The concentration range determined for chloride, bromide and iodide is widened, and the determination of high molar rate of Cl^-/Br^- has been successfully carried out by controlling condition of titration and with Gran plot method. The results of ana lysis for chloride, bromide and iodide with different molar rate from 1: 1: 1 to 100: 1: 1 were accurate. The detection range of Cl^-, Br^-and I^- is from 1 mol/L to 2×10^(-4) mol/L at the molar rate of 1: 1: 1. Cl^-: 1—2×10^(-3)mol/L, Br^-, I^-: 10^(-1)—2×10^(-4)mol/L at the molar rate of 10: 1: 1. Cl^-: 1—2×10^(-3)mol/L, Br^-, I^-: 10^(-2)-2×10^(-5)mol/L at the molar rate of 100: 1: 1. The experiments show that simultaneous potentiometric titration of Cl^-, Br^- and I^- by this method is accurate, simple, rapid and practical.