摘要
为了探讨表面活性剂对催化动力学法测定痕量铁的影响 ,应用分光光度法 ,对不同类型表面活性剂及混合表面活性剂胶束增溶、增敏行为进行了考察 ,提出了以过氧化氢为氧化剂 ,甲基紫为显色剂 ,硫酸为酸性介质 ,在非离子表面活性剂吐温 -80增敏作用下 ,痕量铁能强烈催化过氧化氢氧化甲基紫褪色 ,使其灵敏度得到提高 ,并研究了该反应动力学条件 ,测定其反应活化能及表观速率常数 ,建立了催化动力学光度法测定痕量铁 (III)的新体系。方法灵敏度高 ,选择性、重现性好 ,一定量的常见离子不干扰测定 ,检出限为 2 .2 4 7× 1 0 - 10 g/mL ,测定线性范围为 0～ 0 .8μg/2 5mL。用于人发、豆样和水样中铁的测定 ,回收率均在 96%以上 ,结果满意。
In order to research the effects of the surface active agent on catalytic kinetics measuring trace Fe(Ⅲ), the studies have been made as to the phenomenon of increasing solution and sensitivity of the different types surface active agent and the mixed surface active agent capsule with spectrometer, and a new method has been put forward. That is, under the increasing sensitivity effects of nonionic surface active agent Tween-80, with H 2O 2 as the oxide, methyl purple as indicator and sulphuric acid as acid medium, trace Fe(Ⅲ) can greatly catalyze H 2O 2 to oxidize methyl purple, which can increase the sensitility.The kinetic equation of the reaction and the kinetic parameter were established. Activation energy and rate constant of reaction were determined. The present method has high selectivity and good repeatability. The detection limit for Fe(III) is 2.247×10 -10 g/mL. The linear range of determination is 0～0.8 μg/25mL. Rate of recovery exceeds 96%. Satisfactory results were obtained for the determination of trace Fe(III) in human hair, bean and water samples.
出处
《抚顺石油学院学报》
2000年第4期16-18,30,共4页
Journal of Fushun Petroleum Institute
