铬(Ⅵ)-过氧化氢-中性红体系催化荧光光度法测定工业废水中铬(Ⅵ)  

Determination of chromium (Ⅵ) in industry wastewater by catalytic fluorescence spectrophotometry in Cr(Ⅵ)-hydrogen peroxide-neutral red system

作　　者：刘卫洁[1] 王胜利[1] 高玉红[1] 冯存霞[1] 

机构地区：[1]邯郸学院化学系,河北邯郸056003

出　　处：《冶金分析》2012年第5期49-52,共4页Metallurgical Analysis

摘　　要：在稀硫酸介质中,痕量Cr(Ⅵ)对过氧化氢-中性红的反应体系具有催化作用,使体系的荧光强度增强,且Cr(Ⅵ)的质量浓度在8.0～48.0μg/L范围内与荧光强度的改变值(△F)呈线性关系,据此建立了催化荧光光度法测定Cr(Ⅵ)的新方法。该体系的激发和发射波长(λex和λem)分别为547nm和648nm。通过实验测得催化反应的表观速率常数k和反应活化能Ea分别为8.05×10-2s-1和31.47kJ.mol-1,Cr(Ⅵ)的检出限为4μg/L。将本方法用于合成水样和冶金工业废水中Cr(Ⅵ)的测定,所得结果与二苯碳酰二肼分光光度法测得值吻合,相对标准偏差(RSD,n=5)小于4%。Trace chromium （VD had catalytic effect on hydrogen peroxide - neutral red reaction system in diluted sulfuric acid medium, enhancing the fluorescence intensity. Moreover, the mass concontration of Cr （Ⅵ） in the range of 8.0-48. 0μg/L showed linearity to the change of fluorescence intensity （AF）. Based on this, a new determination method of Cr （Ⅵ） by catalytic fluorescence spectrophotome- try was established. The excitation wavelength （λex） and emission wavelength （λem） of this system was 547 nm and 648 nm, respectively. The apparent rate constant （k） and reaction activation energy （Ea） of catalytic reaction was 8.05×10-2s-1 and 31.47 kJ.mol-1, respectively. The detection limit of Cr （Ⅵ） was 4 μg/L. The method was applied to the determination of Cr （Ⅵ） in synthetic water sample and metallurgical industry wastewater. The found results were consistent with those obtained by diphenylcarbazide spectrophotometry. The relative standard deviation （RSD, n = 5） was smaller than 4%.

关 键 词：催化荧光光度法 中性红 过氧化氢 铬(Ⅵ) 

分 类 号：O657.32[理学—分析化学]