【摘要】 在浓度为0.5mmol/L,流速为2.26mL/min的HNO₃截流下,以活性Al₂O₃微型柱在线分离工业废水中的Cr（Ⅲ）和Cr（Ⅳ）,吸附的Cr（Ⅳ）用0.1mol/LNH₃ H₂O从柱上洗脱,用分光光度法测定。将试样经碱性KMnO₄法氧化处理后,在相同条件和系统中测定总铬,用差减法得到Cr（Ⅲ）含量。本法分析速度为36样/h,回收率100％～110％,相对标准偏差为0.8％（2mg/L）和5.3％（0.1mg/L）。更多还原

【Abstract】 A rapid and sensitive method for using a microcolumn of activated alumina in FIA manifold to separate and preconcntration Cr(Ⅵ) from Cr(Ⅲ) in the sample of industrial waste water and to determine with sepctrophotometric detection has been developed.The total Cr was determinated under same conditions after the sample was treated with basic KMnO4,and the concentration of Cr(Ⅲ) was finally obtained by taking a difference.The sampling rate was 36 samples/h,the range of the recoveries was 100% ~ 200% and the relative standard deviation at 2 and 0.1mg/L were 0.8 and 5.3%,respectively.更多还原