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Incomplete Oxidation of Ethylenediaminetetraacetic Acid in Chemical Oxygen Demand Analysis
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ABSTRACT:
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 o...
Related newspaper, magazine, and journal articles from HighBeam Research
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Incomplete Oxidation of Ethylenediaminetetraacetic Acid in Chemical Oxygen Demand Analysis
Water Environment Research
; ABSTRACT: 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
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PUBLIC NOTICES
The Journal Record
; (21965) (Published By The Journal Record April 6th, 1988.) LEGAL NOTICES TO THE PUBLIC The companies listed below are those industries identified by the Industrial Waste Code Enforcers of the Oklahoma City Water Resources Department as significantly violating industrial users of the Oklahoma City
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Chemical oxygen demand analysis of wastewater using trivalent manganese oxidant with chloride removal by sodium bismuthate pretreatment
Water Environment Research
; ABSTRACT: Current chemical oxygen demand (COD) analyses generate wastes containing hexavalent and trivalent chromium, mercury, and silver. Waste disposal is difficult, expensive, and poses environmental hazards. A new COD test is proposed that eliminates these metals and shortens analysis time,
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Oxygen demand analyser.(Ionics Inc.)(Brief Article)
Chemistry and Industry
; Ionics presents its on-line total oxygen demand analyser for the monitoring of oxygen demand in wastewaters. The system is said to be mechanically easy to use and low maintenance, suitable for remote locations where it can be left unattended for days on end.
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Oxygen mass-transfer coefficients for different sample containers used in the headspace biochemical oxygen demand test
Water Environment Research
; ABSTRACT: To accurately measure the oxygen demand of a wastewater sample in a headspace biochemical oxygen demand (HBOD) or other respirometric test, the rate of oxygen transfer to the aqueous phase must be greater than the oxygen exertion rate by the sample. Oxygen mass-transfer coefficients
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Test predicts WWTP upsets.(News & Views)
Public Works
; The chemical oxygen demand (COD) test by Bioscience Inc., Bethlehem, Pa., can predict possible plant upsets before they occur. A more rapid and mercury-free test now is available that measures contaminants that can be readily oxidized. High COD in the influent can signal an abnormal event such as
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BOD: the modern alchemy. (biochemical oxygen demand)
Public Works
; Despite our supposed belief in science, the age of alchemy is with us still. Anyone who doubts this has only to look in any wastewater laboratory. There, sandwiched between the latest high-tech computers and analytical instruments, at least one incubator will inevitably be devoted to a test better
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Hydrothermal Oxidation of Waste Lipids, Protein, and Starch from New Zealand Meat- and Vegetable-Processing Plants
Water Environment Research
; ABSTRACT: Disposal of organic waste materials from the meat- and vegetable-processing industries historically has been undertaken by dumping, drying followed by combustion, or biological oxidation. As a result of higher intensity processing rates and increasingly stringent legislation, these are no
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COD reagent vials: in expanded pack counts.(advertisement)(chemical oxygen demand)(Brief Article)(Product Announcement)
Laboratory Equipment
; Booth 1941. Reagent vials for performing chemical oxygen demand (COD) analysis are now available in 150-count packs for both the 0-150 and 0-1500 ppm ranges and 100-count packs for the 0-15,000 range vials. COD is a measure of the oxygen-consuming capacity of organic contamination present in
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Instruments offer ease of use for COD measurement.(chemical oxygen demand)(Brief Article)
Journal of Environmental Health
; To enhance its U.S. EPA--approved, cost-effective chemical oxygen demand (COD) product line, CHEMetrics now presents two COD photometers: a low-range (0-150 ppm) instrument (Catalog No. A-7320) and a high-range (0-1,500 and 0-15,000 ppm) instrument (Catalog No. A-7325). The new instruments provide
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