CHEMICAL OXYGEN DEMAND (COD)

Chemical Oxygen Demand

 COD

 

 

Hanna Instruments offers a variety of instrumentation for measuring Chemical Oxygen Demand (COD).  From benchtop meters and Photometers to certified reagents, Hanna has an accurate, affordable solution for nearly any COD application.  Choose a category above to learn more about our COD testing products. 

The HANNA COD method is based on the well established closed dichromate-reflux colorimetric method.

What is Chemical Oxygen Demand (COD)?

Chemical oxygen demand (COD) test is commonly used to indirectly measure the amount of organic compounds in water.Most applications of COD determine the amount of organic pollutants found in surface water.

How is COD measured?

It is expressed in milligrams per liter (mg/L), which indicates the mass of oxygen consumed per liter of solution. Older references may express the units as parts per million (ppm).

Why Measure COD?

COD is often measured as a rapid indicator of organic pollutant in water. It is normally measured in both municipal and industrial wastewater treatment plants and gives an indication of the efficiency of the treatment process. COD is measured on both influent and effluent water. The efficiency of the treatment process is normally expressed as COD Removal, measured as a percentage of the organic matter purified during the cycle.

What is Biochemical oxygen demand (B.O.D.)?

Biochemical oxygen demand or B.O.D. is the amount of dissolved oxygen needed by aerobic biological organisms in a body of water to break down organic material present in a given water sample at certain temperature over a specific time period.

B.O.D. and COD

Biochemical Oxygen Demand (BOD) is an empirical test that determines the relative oxygen requirements of wastewater, effluent and polluted waters. BOD tests measure the molecular oxygen utilized during a specified incubation duration for the biochemical degradation of organic material (carbonaceous demand) and the oxygen used to oxidize inorganic material such as ferrous iron and sulfides. The most common BOD test consists of a 5 day period in which a sample is placed in an airtight bottle under controlled conditions temperature (20ºC ± 1ºC), keeping any light from penetrating the sample to prevent photosynthesis. The Dissolved Oxygen (DO) in the sample is measured before and after the 5 day incubation period, and BOD is then calculated as the difference between initial and final DO measurements. BOD can be considered a more "natural" test in determining the oxygen required to oxidize organic matter, however it does not account for rapid changes in conditions. COD is often preferred for daily analysis since it is inherently more reproducible, accounts for changing conditions and takes a short time to complete

 

Chemical Oxygen Demand       Hanna Instruments offers a variety of instrumentation for measuring Chemical Oxygen Demand (COD).  From benchtop meters and... read more »
Close window
CHEMICAL OXYGEN DEMAND (COD)

Chemical Oxygen Demand

 COD

 

 

Hanna Instruments offers a variety of instrumentation for measuring Chemical Oxygen Demand (COD).  From benchtop meters and Photometers to certified reagents, Hanna has an accurate, affordable solution for nearly any COD application.  Choose a category above to learn more about our COD testing products. 

The HANNA COD method is based on the well established closed dichromate-reflux colorimetric method.

What is Chemical Oxygen Demand (COD)?

Chemical oxygen demand (COD) test is commonly used to indirectly measure the amount of organic compounds in water.Most applications of COD determine the amount of organic pollutants found in surface water.

How is COD measured?

It is expressed in milligrams per liter (mg/L), which indicates the mass of oxygen consumed per liter of solution. Older references may express the units as parts per million (ppm).

Why Measure COD?

COD is often measured as a rapid indicator of organic pollutant in water. It is normally measured in both municipal and industrial wastewater treatment plants and gives an indication of the efficiency of the treatment process. COD is measured on both influent and effluent water. The efficiency of the treatment process is normally expressed as COD Removal, measured as a percentage of the organic matter purified during the cycle.

What is Biochemical oxygen demand (B.O.D.)?

Biochemical oxygen demand or B.O.D. is the amount of dissolved oxygen needed by aerobic biological organisms in a body of water to break down organic material present in a given water sample at certain temperature over a specific time period.

B.O.D. and COD

Biochemical Oxygen Demand (BOD) is an empirical test that determines the relative oxygen requirements of wastewater, effluent and polluted waters. BOD tests measure the molecular oxygen utilized during a specified incubation duration for the biochemical degradation of organic material (carbonaceous demand) and the oxygen used to oxidize inorganic material such as ferrous iron and sulfides. The most common BOD test consists of a 5 day period in which a sample is placed in an airtight bottle under controlled conditions temperature (20ºC ± 1ºC), keeping any light from penetrating the sample to prevent photosynthesis. The Dissolved Oxygen (DO) in the sample is measured before and after the 5 day incubation period, and BOD is then calculated as the difference between initial and final DO measurements. BOD can be considered a more "natural" test in determining the oxygen required to oxidize organic matter, however it does not account for rapid changes in conditions. COD is often preferred for daily analysis since it is inherently more reproducible, accounts for changing conditions and takes a short time to complete

 

Close filters
  •  
from to
1 From 2
No results were found for the filter!
Water & Wastewater Multiparameter (with COD) Photometer and pH meter | HI83399-02
Water & Wastewater Multiparameter (with COD)...
HI83399 is a compact, multiparameter photometer for measuring key water and wastewater quality parameters. The meter is one of the most advanced photometers available with a innovative optical design that utilizes a reference detector...
R 29,436.00 *
HI 740235 COD Adapter for HI 83099
HI 740235 COD Adapter for HI 83099
HI 740235 COD Adapter for HI 83099
R 202.00 *
HI 83224-02 COD/multiparameter photometer w/bar code recognition of sample vials
HI 83224-02 COD/multiparameter photometer w/bar...
COD/multiparameter photometer w/bar code recognition of sample vials; Range: Ammonia LR 0.00 to 3.00 mg/L (as NH3 -N), Ammonia HR 0 to 100 mg/L (as NH3 -N), Chlorine, free 0.00 to 5.00 mg/L , Chlorine, total 0.00 to 5.00 mg/L, Chemical...
R 34,342.00 *
HI93754H-25  COD Reagents, Low Range
HI93754H-25 COD Reagents, Low Range
HI 93754H-25 COD Reagents, Low Range
R 1,382.00 *
HI93754G-25  COD Reagents, Medium Range, ISO
HI93754G-25 COD Reagents, Medium Range, ISO
COD Reagents, Medium Range, ISO
R 1,382.00 *
HI93754F-25  COD Reagents, Low Range, ISO
HI93754F-25 COD Reagents, Low Range, ISO
HI 93754F-25 COD Reagents, Low Range, ISO
R 1,382.00 *
HI93754E-25  COD Reagents, Medium Range, Mercury Free
HI93754E-25 COD Reagents, Medium Range,...
Reagents for COD, Medium Range, mercury free* *This method is recommended for general purpose analysis with no chloride interference. Order Information: Reagent kit for 25 test vials (O2) SpecificationsMSDSDownloads Range 0 to 1500 mg/L...
R 1,128.00 *
HI93754D-25  COD Reagents, Low Range, Mercury Free
HI93754D-25 COD Reagents, Low Range, Mercury Free
Reagents for COD, LR, mercury-free* *This method is recommended for general purpose analysis with no chloride interference. Order Information: Reagent kit for 25 test vials (O 2 ) ?SPECIFICATIONS : Range 0 to 150 mg/L (ppm) Sample qty....
R 1,128.00 *
HI93754B-25 Medium Range COD Reagent (0 to 1500 mg/L)
HI93754B-25 Medium Range COD Reagent (0 to 1500...
COD Reagent kit for 25 test vials (O2)
R 1,382.00 *
HI93754A-25 Low Range COD Reagent (0 to 150 mg/L)
HI93754A-25 Low Range COD Reagent (0 to 150 mg/L)
COD Reagent kit for 25 test vials (O2)
R 1,382.00 *
H93754C-25 High Range COD Reagent (0 to 15000 mg/L)
H93754C-25 High Range COD Reagent (0 to 15000...
COD Reagent kit for 25 test vials (O2)
R 1,382.00 *
HI740217 Lab Safety Shield
HI740217 Lab Safety Shield
Laboratory bench safety shield for COD measurement
R 1,742.00 *
1 From 2
Viewed