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Determination of chemical oxygen demand in aqueous environmental samples by segmented flow-injection analysis

✍ Scribed by Li-Ching Tian; Sao-Ming Wu

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 356 KB
Volume: 261
Category: Article
ISSN: 0003-2670
DOI: 10.1016/0003-2670(92)80206-m

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✦ Synopsis

A method IS described for the determmatlon of chemxal oxygen demand (COD) m aqueous envIronmenta samples by segmented flow-mjectlon analysis KMnO, solution IS used as both an oxidant and a spectrophotometrlc reagent and o-glucose as a standard When the reaction temperature IS 95"C, the residence time IS about 8 mm and a sample throughput of 80 h-' can be achieved The detection hrmt and relative standard devlatlon are 2 mg 1-l and 0 7%, respectwely, and the recovery 1s 85-95% Chloride ton up to levels of 1500 mg I-' does not Interfere COD values for aqueous environmental samples are compared with those obtained usmg the Japanese Industrial Standard method and agreed wthm an error range of rt 10% &vwords Flow system, Spectrophotometry, Chemical oxygen demand, Waters

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