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Water Science & Technology Vol 66 No 5 pp 1069–1073 © IWA Publishing 2012 doi:10.2166/wst.2012.288 Replacing dichromate with hydrogen peroxide in the chemical oxygen demand (COD) testPatricia Carbajal-Palacios, Patricia Balderas-Hernández, Jorge G. Ibanez and Gabriela Roa-MoralesCentro Conjunto de Investigacion en Quimica Sustentable UAEMex-UNAM, Carretera Toluca-Atlacomulco Km 14.5, 50200 Toluca, MexicoCentro Mexicano de Quimica Verde y Microescala, Depto. de Ing. y C. Quimicas, Universidad Iberoamericana. Prol. Reforma 880, 01219 Mexico D.F., Mexico E-mail: jorge.ibanez@uia.mx ABSTRACT The widely used standard method for chemical oxygen demand (COD) involves hazardous chromium species, and its two-hour heating protocol entails a substantial amount of energy expenditure. In the present work we report a proof of concept for a major modification of this method in the range 10–800 mgCOD/L, whereby H2O2 is proposed as a replacement oxidizer. This modification not only reduces the use of unsafe chromium species but also allows for the use of milder conditions that decrease the total energy outlay. The results are comparable with those obtained either with the standard method or with a commercial Hach® kit. Keywords: chemical oxygen demand; dichromate; green chemistry; hydrogen peroxide; oxidation eProduct: Buy this article for £24.00 (IWA MEMBER PRICE: £18.00) All prices include VAT. For customers where VAT should not be applied, the VAT amount will be removed upon payment |
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