Document Detail

Incomplete oxidation of ethylenediaminetetraacetic acid in chemical oxygen demand analysis.
MedLine Citation:
PMID:  17910374     Owner:  NLM     Status:  MEDLINE    
Ethylenediaminetetraacetic acid (EDTA) was found to incompletely oxidize in chemical oxygen demand (COD) analysis, leading to incorrect COD values for water samples containing relatively large amounts of EDTA. The degree of oxidation depended on the oxidant used, its concentration, and the length of digestion. The COD concentrations measured using COD vials with a potassium dichromate concentration of 0.10 N (after dilution by sample and sulfuric acid) were near theoretical oxygen demand values. However, COD measured with dichromate concentrations of 0.010 N and 0.0022 N were 30 to 40% lower than theoretical oxygen demand values. Similarly, lower COD values were observed with manganic sulfate as oxidant at 0.011 N. Extended digestion yielded somewhat higher COD values, suggesting incomplete and slower oxidation of EDTA, as a result of lower oxidant concentrations. For wastewater in which EDTA is a large fraction of COD, accurate COD measurement may not be achieved with methods using dichromate concentrations less than 0.1 N.
James E Anderson; Sherry A Mueller; Byung R Kim
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Water environment research : a research publication of the Water Environment Federation     Volume:  79     ISSN:  1061-4303     ISO Abbreviation:  Water Environ. Res.     Publication Date:  2007 Sep 
Date Detail:
Created Date:  2007-10-03     Completed Date:  2008-01-04     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9886167     Medline TA:  Water Environ Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1043-9     Citation Subset:  IM    
Systems Analyses and Environmental Sciences Department of Research and Advanced Engineering, Ford Motor Company, Dearborn, Michigan, USA.
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MeSH Terms
Chelating Agents / chemistry*
Edetic Acid / chemistry*
Environmental Monitoring / methods*
Oxygen / analysis*,  chemistry,  metabolism*
Spectrophotometry, Atomic / methods
Time Factors
Reg. No./Substance:
0/Chelating Agents; 60-00-4/Edetic Acid; 7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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