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J. Technology and Education, Vol.18, No.2, pp.71-78, 2011

マイクロ波を利用した簡易で迅速なＣＯＤ測定法の開発

荒川豊^*1，栗田惠子¹，杉森博和¹，田熊保彦¹，安藤恵理¹，山田明文²

¹地方独立行政法人東京都立産業技術研究センター
（〒115-8586 東京都北区西が丘3-13-10）
²国立大学法人長岡技術科学大学テクノインキュベーションセンター
（〒940-2188 長岡市上富岡町1603-1）

^* arakawa.yutaka@iri-tokyo.jp

Development of a Simple and Quick COD Measuring Method with a Microwave

Yutaka ARAKAWA,¹ Keiko KURITA,¹ Hirokazu SUGIMORI,¹
Yasuhiro TAKUMA,¹ Eri ANDO,¹ and Akifumi YAMADA²

¹Tokyo Metropolitan Industrial Technology Research Institute
(3-13-10 Nishigaoka，Kita-ku，Tokyo 115-8586)
²Nagaoka University of Technology，Techno-Incubation Center
(1603-1 Kamitomioka，Nagaoka，Niigata 940-2188)

(Received July 14, 2011; Accepted August 12, 2011)

A simple and quick COD (Chemical Oxygen Demand) measuring method which reduces environmental impact and analysis costs was developed. The COD - sewer alkalinity test was chosen as a method which does not use an expensive silver reagent or toxic substance. A commercial electric pipette was applied to a micro-titration operation required to make a 1/10 scale analysis. The microwave oven used to shorten the analysis time reduced the heating time from 30 to 5 minutes. The stirrer bar made from PTFE solved a bumping problem during heating, and the uneven heating problem was overcome through the design and manufacture of the exclusive vial rack. Furthermore, the reaction stop process was simplified by using a mixed reagent; 12.5 mM (mM = mol m^-3) -sodium oxalate and sulfuric acid (1+2). The time required for the analysis was 1/5 shorter than that of the official method (COD_Mn), and the amounts of reagents consumed and waste fluid produced were 1/10 or less. The measurement reproducibility of this method was 5 % or less, and, compared with the official method, the correlation coefficient for varied organic matter was 0.9 or more.

Keywords: COD, microwave oven, electronic pipette, vial rack