title: A modified method for estimation of chemical oxygen demand for samples having high suspended solids.
abstract: 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.
authors.affiliation: Centre for Rural Development and Technology, Indian Institute of Technology, Delhi 110016, India.
authors.lastname: Yadvika
authors.forename: Asheesh Kumar
authors.initials: AK
authors.lastname: Yadav
authors.forename: T R
authors.initials: TR
authors.lastname: Sreekrishnan
authors.forename: Santosh
authors.initials: S
authors.lastname: Satya
authors.forename: Sangeeta
authors.initials: S
authors.lastname: Kohli
mesh_terms: D000818:Animals; D019149:Bioreactors; D002417:Cattle; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D008372:Manure / Q000032:analysis*; D010100:Oxygen / Q000032:analysis*
chemical_list: D008372:Manure; D010100:Oxygen