Tm. Lapara et al., Miniaturized closed reflux, colorimetric method for the determination of chemical oxygen demand, WASTE MAN, 20(4), 2000, pp. 295-298
The standard technique for the closed reflux, colorimetric analysis of chem
ical oxygen demand (COD) utilizes several hazardous compounds, including me
rcury, silver, chromium, and sulfuric acid. A miniaturized version of this
analytical technique was developed, thereby reducing the use and disposal o
f these hazardous compounds by 84%. The miniaturized method demonstrated a
similar level of accuracy as the conventional technique for both synthetic
and actual wastewater samples. This method for closed reflux, colorimetric
analysis of COD therefore represents an excellent opportunity for hazardous
waste minimization in environmental water quality laboratories without com
promising analytical accuracy. (C) 2000 Elsevier Science Ltd. All rights re
served.