溴酸钾催化氧化结晶紫-茜素红光度法测定废水中痕量铬(Ⅵ)  

Determination of trace chromium (Ⅵ) in waste water by crystal violet-alizarin red spectrophotometry with potassium bromate catalytic oxidiation

作　　者：贾华丽[1] 李艳霞[1] 王丽品[1] 

机构地区：[1]周口师范学院化学系,河南周口466000

出　　处：《冶金分析》2010年第12期74-76,共3页Metallurgical Analysis

摘　　要：在H2SO4介质中,痕量铬(Ⅵ)能催化溴酸钾氧化结晶紫和茜素红褪色的指示反应,通过测量627 nm和423 nm处催化反应体系和非催化反应体系吸光度的变化,建立了双波长双指示剂催化动力学光度法测定痕量铬(Ⅵ)的新方法。方法的线性范围为0.04～0.16μg/mL,检出限为11.41 ng/mL。该方法用于电镀废液中铬(Ⅵ)的测定,测定值与原子吸收分光光度法测得结果一致,加标回收率为98%～102%。Trace chromium（Ⅵ） could catalyze the oxidation reaction of crystal violet-alizarin red by potassium bromate in H2SO4 medium.A new determination method of trace chromium（Ⅵ） by double-wavelength double-indicator catalytic kinetic spectrophotometry was established through studying the absorbance change of catalytic reaction system and non-catalytic reaction system at 627 nm and 423 nm.Linear range of this method was 0.04-0.16 μg/mL for chromium,and detection limit was 11.41 ng/mL.The proposed method has been applied to the determination of chromium（Ⅵ） in electroplating effluent.The results were in coincidence with those obtained by atomic absorption spectrometry with recoveries of 98 %-102 %.

关 键 词：铬(Ⅵ) 催化光度法 双波长 双指示剂 结晶紫 茜素红 

分 类 号：X832[环境科学与工程—环境工程]