摘要
首次将镀铜锌粒作成优良的还原柱,在线还原Cr(Ⅵ)成 Cr(Ⅲ),以鲁米诺-H～2O～2(KBr)体系流动注射化学发光同时测定废水中两种价态的铬.分析速率为 60试样/h;线性范围为1.0×10～(-5)～1.0×10～(-9)mol/L;测Cr(Ⅲ)及Cr(Ⅵ)的相对标准偏差(n=6)分别为0.37％～4.0％及1.2％～4.4％;测定Cr(Ⅲ)的检出限2.3×10～(-11)mol/L.测定结果与标准方法无显著差异.还原柱至少可供2200次进样使用.
Two valence types of Cr in waste water were determined simultaneously with flow injection analysis monitored by chemiluminescence from luminol-H2O2(KBr) system based on the in-site reduction of Cr( Ⅵ ) to Cr( Ⅲ ) by an excellent reduction column made of zinc coated with copper. The shunt divided the sample into two portions. The analysis rate was 60 samples/h, and the dynamic range of the analysis 1 × 10-5- 1 × 10-9mol/L. The relative standard deviation(n - 6) was 0. 37%-4. 0% for Cr( Ⅲ ) and 1. 2%-4. 4% for Cr( Ⅵ ). The detection limit for Cr( Ⅲ ) was 2. 3×10-11mol/L. and the determination results for waste water samples were in good agreement with those of ,he standard method. The reduction column can be used for 2200 samples at least.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1995年第10期1148-1150,共3页
Chinese Journal of Analytical Chemistry
关键词
流动注射
化学发光
铬
废水
Flow injection analysis, cherailumir.csce.fco. fhrorpium. waste water, simultaneous determination
