フローインジェクション分析法に基づく化学的酸素要求量測定装置

概要

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A simple apparatus was developed for the rapid and continuous determination of chemical oxygen demand (COD) in environmental water samples based on the principle of flow injection-spectrophotometric analysis. A solution of 2.7×10^<-4> M potassium permanganate in 3.3 % sulfuric acid was pumped with a reciprocating pump into the manifold to which 20μl of sample (i.e. sodium oxalate solution) was also introduced by manual injection. After reaction, the mixture went through a quartz flow cell (10mm light path, 18μl volume) placed in a spectrophotometer operated at a wavelength of 525 nm. The manifold was made entirely of polytetrafluoroethylene tubing (0.5mm inner diameter, 10 m length) . The signal from the spectrophotometer was continuously recorded. When a pumping rate was chosen to be 1.9 ml min^<-1> a residence time was 1 min. A sampling rate of 120 samples per hour was achieved and the apparent COD at a concentration range of (21-170)mg COD 1^<-1> was measured reproducibly. Chloride at 10mg 1^<-l> level was suppressed by adding 0.1 % silver nitrate in the flow injection system.
社団法人日本分析化学会の論文
1980-03-05