过氧化氢-茜素红s体系催化动力学分光光度法测量痕量钴(Ⅱ)  

Catalytic Kinetic Determination of Trace Cobalt(Ⅱ) Based on Oxidation of Alizarin Red s by Hydrogen Peroxide

作　　者：张皓爽 姬泓巍[1] 宰敬喆 韩婷婷 ZHANG Hao-Shuang JI Hong-Wei ZAI Jing-Zhe HAN Ting-Ting(The Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemical Engineering, Ocean University of China, Qingdao 266100,China)

机构地区：[1]中国海洋大学化学化工学院,海洋化学理论与工程技术教育部重点实验室,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2017年第11期61-69,共9页Periodical of Ocean University of China

摘　　要：本文利用催化动力学原理,建立了新的测定痕量钴(Ⅱ)的分析方法。研究体系为:钴(Ⅱ)-茜素红s-过氧化氢-碳酸钠。所得的最佳反应条件为:pH=11.00,反应时间t=7.50min,反应温度θ=35.0℃,ρ(C_(14)H_7O_7SNa·H_2O)=6.400×10^(-2) g·L^(-1),Φ(H_2O_2)=7.200×10-2%。在该反应条件下,此分析方法的相对标准偏差为1.85%~2.96%,检出限为4.21×10^(-2)ng/mL。在淡水体系中相对标准偏差在1.93%~2.79%之间,而加标回收率在98.7%~101.3%之间。相较于其他测量方法,本文所建立的分析方法具有操作简单,分析温度低,准确度高,检出限低,分析时间短等优点。Based on catalytic kinetic theory,a new spectrophotometric method to analyze cobalt（Ⅱ） is established.The new reaction system is put forward for the determination of trace cobalt（Ⅱ） using alizarin red s as indicator and hydrogen peroxide as oxidant.The optimal reaction conditions are as follows：pH=11.00,reaction time t = 7.50 min,reaction temperatureθ = 35.0℃,ρ（C（14）H7O7SNa·H2O）=6.400 ×10^-2g·L^-1,Φ（H2O2）= 7.200 ×10-^2%.Under the optimal reaction conditions,the relative standard deviation of the proposed method is in the range of 1.85% ～2.96%,and the detection limit is4.21 ×10^-2 ng·mL^-1.The new method can be successfully applied to the measurement of cobalt（II）in the Yellow River from Lijin district and Haibo river.Compared with other measurement methods,the proposed method has low detection limit,simple operation,and can be used at low temperature.

关 键 词：钴(Ⅱ)的测定 催化动力学分光光度法 茜素红S 过氧化氢 

分 类 号：P734.4[天文地球—海洋化学]