Yadav Asheesh Kumar, Sreekrishnan T R, Satya Santosh, Kohli Sangeeta
Centre for Rural Development and Technology, Indian Institute of Technology, Delhi 110016, India.
Bioresour Technol. 2006 Mar;97(5):721-6. doi: 10.1016/j.biortech.2005.04.013. Epub 2005 Sep 21.
Determination of chemical oxygen demand (COD) of samples having high suspended solids concentration such as cattle dung slurry with open reflux method of APHA-AWWA-WPCF did not give consistent results. This study presents a modification of the open reflux method (APHA-AWWA-WPCF) to make it suitable for samples with high percentage of suspended solids. The new method is based on a different technique of sample preparation, modified quantities of reagents and higher reflux time as compared to the existing open reflux method. For samples having solids contents of 14.0 g/l or higher, the modified method was found to give higher value of COD with much higher consistency and accuracy as compared to the existing open reflux method.
