关键词: 锌, 硫酸亚铁, 铁, 离子选择电极, 痕量分析, 过氧化氢, 动力学分析, 铊离子, 电位测定, 水质水析

Fe(II) induces the reaction between Tl3+ and H2O2. The rate of reaction is linearly proportional to the concentration of Fe2+ in the range 2.5 ?10-9-2.5 ?10-8 mol dm-3 (20? and 5 ?10-9-5 ?10-8 mol dm-3 (15?. The standard deviation is less than 0.071 ?10-8. A 1000-fold excess of Zn2+, Cd2+, Mg2+, Ni2+, Pb2+, Ba2+, Ca2+, Li+, Na+, Ag+, NO3-, SO42-, AcO-, HPO42-, 500-fold excess of Al3+, Fe3+, Co2+, Hg2+ and 100-fold excess of Ti4+, Cr3+, Cu2+, Br-, Cl- can be tolerated, but reducing agents such as (NH2)2SO4, NH2OH.HCl interfered. This kinetic method was applied to determine Fe(II) in standard zinc sample and fountain water, with satisfactory results.

Key words: ZINC, FERROUS SULFATE, IRON, ION SELECTIVE ELECTRODE, TRACE ANALYSIS, HYDROGEN PEROXIDE, KINETIC ANALYSIS, THALLIUM ION, POTENTIOMETRIC DETERMINATION, WATER QUALITY ANALYSIS