Results 251 to 260 of about 440,588 (304)

Recent Developments in Cellulose/Chitosan Biopolymer Composites for Winery Wastewater Treatment and Reuse: A Review. [PDF]

Materials (Basel)
Kumalo FI, Mugudamani I, Atangana E, Gumede TP.   +3 more
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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
openaire   +1 more source

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
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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
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Chemical Oxygen Demand Using Closed Microwave Digestion System

Environmental Science & Technology, 2005
A new approach to determine the chemical oxygen demand (COD) using a closed microwave digestion (CMD) system to replace the conventional, time-consuming open reflux (OR) method is proposed. The procedure uses a laboratory-grade closed microwave digestion system (one magnetron) for the digestion of small volume of samples (3.0 mL) in a completely closed
Dattatray M, Dharmadhikari, Atul P, Vanerkar, Nivedita M, Barhate   +2 more
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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
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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
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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
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Chemical oxygen demand (COD) using microwave digestion

Water Research, 1989
Abstract A new approach to determine the Chemical Oxygen Demand (COD) using a microwave digestion to replace the conventional time consuming reflux method is proposed. The procedure uses a microwave oven for the digestion of small volumes of sample (from 500 up to 2000 μ1), in a completely closed 60 ml Teflon vessel. For samples showing COD values up
Wilson F. Jardim, Jarbas J.R. Rohwedder
openaire   +1 more source