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铬(Ⅵ)-结晶紫-过氧化氢体系催化动力学光谱法测定痕量铬(Ⅵ)
Catalytic Kinetic Spectrometric Determination of Trace- Chromium（Ⅵ） Cation Using Oxidation of Crystal Violet with H2O2
【Author】 Kuang Hai-yan~1 Jin Yan~2 Li Shi-rong~2 Song Zhong-rong~(2*) 1.Chemistry and Chemical Engineering College,Chongqing University,Chongqing 400030,China; 2.Chemical and Environmental Engineering College,Chongqing University of Arts and sciences,Yongchuan 402168,China
【机构】 重庆大学化学化工学院； 重庆文理学院化学与环境工程学院；
【摘要】 75℃温度下,在硫酸介质中,铬（Ⅵ）能显著催化过氧化氢氧化结晶紫褪色反应,铬（Ⅵ）浓度在一定范围内与催化和非催化反应的吸光度差值（ΔA）成线性关系,且ΔA在较长时间内稳定。以此建立起动力学光度法测定痕量铬（Ⅵ）的新方法。实验研究了该反应的动力学行为,确定了最佳反应条件。方法线性范围为0～96μg·L-1,其线性回归方程为ΔA=0.0033+0.1401C（Ⅵ）(μg·25mL-1)（r=0.9985）检出限为6.91μg·L-1。本方法操作简单,选择性好,可用于电镀废水、工业废水和湖水样品中有毒金属铬（Ⅵ）含量的分析测定。
【Abstract】 A new catalytic kinetic-spectrohpotometric method for the determination of trace chromium（Ⅵ） has been proposed.It was based on the chromium（Ⅵ） cation which could catalyze the redox reaction between H202 and crystal viole in H2SO4 aqueous solution edium at 75℃.The absorbance difference（ΔA）between catalytic reaction and non-catalytic reaction was linear with the concentration of chromium（Ⅵ） in a certain range.On optimum conditions, calibration curve was linear in the range of 0-96μg·mL-1,with the detection limit as low as 6.91μg·mL-1（regression coefficient was 0.9985）.The regression equations wasΔA=0.0033+0.1401C（μg/25mL）.The method was simple and selective.It has been applied satisfactorily to the determination of chromium（Ⅵ） in wastewater samples.
【Key words】 Catalytic kinetic spectrophotometry； crystal violet； Peroxide； Trace Chromium； Determination；
- 【会议录名称】 重庆市化学化工学会2009学术年会论文集
- 【会议名称】重庆市化学化工学会2009学术年会
- 【会议时间】2009-09-19
- 【会议地点】中国重庆
- 【分类号】O657.3;O614.611
- 【主办单位】重庆市化学化工学会(Chongqing Chemistry and Chemical Engineering Society)