显色法测定环境样品中的纳米二氧化钛  

Determination of TiO_2 nanoparticles with spectrometer

作　　者：张学治[1] 孙红文[1] 

机构地区：[1]南开大学环境科学与工程学院,天津300071

出　　处：《安全与环境学报》2006年第2期36-38,共3页Journal of Safety and Environment

摘　　要：水环境中纳米二氧化钛分析方法的建立是研究其环境行为的基础。以钛离子与H2O2的显色反应为基础,建立了用分光光度计测定含纳米二氧化钛水样、鱼样的方法。该方法简便可行,不需要复杂仪器设备,测定结果与ICPAES测定方法相比无显著差异。This paper intends to present the author＇s analysis method for TiO2 nanoparticles in water and fish samples by using a spectrometer, The actual process of the analysis can be done by heating sulphuric acid - ammonium sulphate solution, and then TiO2 nanoparticles would be decomposed into titanium （IV） ion. Decomposed titanium （IV） ions can then react with hydrogen peroxide to form a chromogenic complex. In this situation, the concentration of the TiO2 nanoparticles can be found by determining the amount of the chromogenic complex in 410 nm. Since there exists a positive correlation between absorbency （A） and TiO2 nanoparticles concentration, it is easy to find the cowelation coefficient of the two, which is greater than 0.999, and the regression equation is A = 0.00836C ＋ 0.01353. With water samples of 5.0, 10,0, 20.0, 40.0, 60.0, 80.0, 100.0 mg/L TiO2 nanopartieles will be accurately measured with the recovery raging from 94% to 108% . For the water sample of 20.0 mg/L TiO2, the relative standard deviation （RSD） is 3.84% （ n = 5）. The proposed method has been applied successfully to the analysis of biologic samples. The digestion with a microwave testing, TiO2 nanoparticles in fish samples have been successfully released. Then the released TiO2 nanoparticles were then decomposed, reacted with hydrogen peroxide and last of all determined by the spectrome- ter. Experimental results show that the recovery of fish sample is rag- ing from 90% to 104%. The dissolved titanium ions in the samples （both water samples and fish samples） were also determined by ICP- AES and there was no significant difference between the results of this simple, effective method and ICP-AES method.

关 键 词：环境化学 纳米二氧化钛 测定 显色法 ICP-AES 

分 类 号：X132[环境科学与工程—环境科学]