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Title: A modified method for the determination of chemical oxygen demand (COD) for samples with high salinity and low organics
Authors: Stuckey, David C. 
Vyrides, Ioannis 
Keywords: Oxygen;Salinity;Sewage
Issue Date: 2009
Publisher: Elsevier
Source: Bioresource Technology, 2009, Volume 100, Issue 2, Pages 979-982
Abstract: This study proposes a modification to the standard method for the determination of the chemical oxygen demand of samples with a salinity up to 40 g NaCl/L and low organic concentrations (20-230 mg COD/L). The masking of chloride by the use of a HgSO4:Cl ratio of 20:1 prior to digestion, and the use of 3 g K2Cr2O7/L in the digestion solution resulted in an error of less than 10% and 12% for samples containing 40 g NaCl/L at 20-190 mg COD/L and 230 mg COD/L, respectively. Comparison of the standard method with the new proposed method using a synthetic sewage highlights the large errors (50-85%) of the standard method in contrast to an error of less than 10% for the proposed modified method.
ISSN: 09608524
Rights: © 2008 Elsevier Ltd. All rights reserved
Type: Article
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