Results 241 to 250 of about 8,546,464 (293)

Chemical Oxygen Demand

Russian Journal of Applied Chemistry, 2005
New instrumental methods and tendencies of development of direct potentiometric determination of the chemical oxygen demand in the framework of the standard technique are considered.
A. M. Pisarevsky, I. P. Polozova, P. M. Hockridge   +2 more
exaly   +2 more sources

Downscaling the chemical oxygen demand test

Environmental Technology, 2014
The usefulness of the standard chemical oxygen demand (COD) test for water characterization is offset to some extent by its requirement for highly toxic or expensive Cr, Ag, and Hg species. In addition, oxidation of the target samples by chromate requires a 2-3 h heating step. We have downscaled this method to obtain a reduction of up to ca. 80% in the
Patricia, Carbajal-Palacios, Patricia, Balderas-Hernandez, Jorge G, Ibanez, Gabriela, Roa-Morales   +3 more
openaire   +2 more sources

Optimization of the determination of chemical oxygen demand in wastewaters

Analytica Chimica Acta, 2011
Chemical oxygen demand (COD) is one of the most relevant chemical parameters for the management of wastewater treatment facilities including the control of the quality of an effluent. The adequacy of decisions based on COD values relies on the quality of the measurements.
Alexandra M E Viana da, Silva, Ricardo J N Bettencourt da, Silva, M Filomena G F C, Camões   +2 more
openaire   +2 more sources

Relationship between theoretical oxygen demand and photocatalytic chemical oxygen demand for specific classes of organic chemicals

The Analyst, 2000
The oxidation behavior of twenty organic chemicals from four different classes (sugars, benzene derivatives, alcohols and carboxyl acids) were investigated using the official chemical oxygen demand (COD) methods (i.e., permanganate and dichromate methods) and their oxidation levels compared with the theoretical oxygen demand (ThOD) values.
Yoon-Chang Kim, Satoshi Sasaki, Kazuyoshi Yano, Kazunori Ikebukuro, Kazuhito Hashimoto, Isao Karube   +5 more
openaire   +1 more source

Hydrogen peroxide interference in chemical oxygen demand during ozone based advanced oxidation of anaerobically digested livestock wastewater [PDF]

International Journal of Environmental Science and Technology, 2011
It is known that hydrogen peroxide interferes with chemical oxygen demand analysis by consuming oxidation agents such as potassium dichromate, thus leading to overestimation of the chemical oxygen demand measurements.
Lee, H., Lee, K., Sohn, K., Kim, Y.K., Lee, E.   +4 more
exaly   +2 more sources

The coulometric determination of chemical oxygen demand

Electroanalysis, 1997
AbstractThe chemical oxygen demand (COD) of solutions containing various organic compounds is calculated from the net faradaic charge (Qnet) estimated for the total electrolytic oxidation of CrIII generated during oxidative degradation of the organic compounds in acidic media containing excess CrVI.
Kim L. Pamplin, Dennis C. Johnson
openaire   +1 more source

Photocatalytic Sensor for Chemical Oxygen Demand Determination Based on Oxygen Electrode

Analytical Chemistry, 2000
The construction and performance evaluation of a novel Chemical Oxygen Demand (COD) sensor is described. The sensor measures, using an oxygen electrode, a decrease of dissolved oxygen of a given sample resulting from photocatalytic oxidation of the organic compounds therein.
Y C, Kim, K H, Lee, S, Sasaki, K, Hashimoto, K, Ikebukuro, I, Karube   +5 more
openaire   +2 more sources

Ultrasound-assisted method for determination of chemical oxygen demand

Analytical and Bioanalytical Chemistry, 2002
A method for determination chemical oxygen demand (COD) assisted by use of ultrasound has been successfully evaluated for the first time. The method uses instrumentation simpler and cheaper and, in some instances, safer than that used by previous methods for the same purpose. The new device used for sonication is an all-glass cylindrical sonotrode that
Antonio, Canals, M, Del Remedio Hernández   +1 more
openaire   +2 more sources

Chemical oxygen demand: Historical perspectives and future challenges

Analytica Chimica Acta, 2017
Determining the chemical oxygen demand (COD) is challenging because of the chemicals that are used in the current methods. There is an urgent need to determine the pollution in surface waters from (heavy) industry via a simple, reliable and fast method.
René Bernard Geerdink, Ricardo Sebastiaan van den Hurk, Onno Jacob Epema   +2 more
openaire   +2 more sources

Dichromate method for the determination of chemical oxygen demand

Journal of Analytical Chemistry, 2000
The oxidizability of organic substances of different classes was studied under the conditions of an official procedure for the determination of chemical oxygen demand (COD) with and without using Ag2SO4 as a catalyst. Organic substances can be divided into three groups: easily oxidizable compounds that are oxidized by 80–100% without a catalyst; medium-
Yu. M. Dedkov, O. V. Elizarova, S. Yu. Kel’ina   +2 more
openaire   +1 more source