COD Digestor Manufacturer,Supplier and Exporter in India
Product Code : EL-RE-3999
Jlab Export is a leading COD Digestor Manufacturer,and suppliers in India
This COD digestor is a thermoreactor for the digestion step of the chemical oxygen demand test. It heats closed tubes of water sample with a strong chemical oxidant at the temperature and for the time the method sets. Labs use it on wastewater and on natural water polluted by domestic or industrial waste.
Specifications
| Type | Thermoreactor for chemical oxygen demand (COD) digestion |
| Method | Closed sample incubated with a strong chemical oxidant |
| Samples | Wastewater and natural water contaminated by domestic or industrial waste |
| Minimum order quantity | 1 unit |
| Dispatch time | Usually 7–10 working days |
| Manufacturer | JLab (Jain Laboratory Instruments Pvt Ltd), Ambala, India |
How the COD Test Works
COD measures the oxygen a water sample would consume as its organic matter breaks down. Oxidisable inorganic matter such as nitrite adds to the result. A measured sample is closed in a tube with the dichromate digestion reagent and held hot under set conditions. The oxidant left over is then measured, and the amount used is expressed as oxygen.
COD Practicals for Environmental Engineering Students
Students collect raw and treated wastewater from a treatment plant or a college drain and measure each sample with Bulb Pipettes, Class B Soda Glass, One Mark JLab. Distilled water from a Water Still Table Model is used for dilutions and for the blank, which goes through every step with the samples.
After digestion and cooling, the leftover dichromate is titrated from a Burette, Borosilicate Glass, with PTFE Stopcock. The COD follows from the difference between the sample and blank titrations. Comparing inlet and outlet samples shows how much of the organic load the plant removes.
Frequently Asked Questions
Why are the sample tubes closed during digestion?
A closed tube keeps volatile organic compounds in the sample, where the oxidant can reach them, and stops the liquid boiling away. It also allows small sample and reagent volumes, which cuts the amount of dichromate and acid waste the lab produces.
How does chloride affect the result?
Chloride is oxidised by dichromate as well, so salty samples such as sea water or some industrial effluents read higher than their real organic load. Standard methods include a step that ties up chloride before digestion, so follow the method your lab uses.
Can the result be read on a colorimeter instead of by titration?
Yes. In the closed-tube colorimetric method, the colour of the digested tube is read on a colorimeter or spectrophotometer against standards. Titration needs only glassware and a burette, so many college labs start with it.
How should wastewater samples be handled before the test?
Mix the sample well so settled solids are included, and test it soon after collection. If it has to wait, keep it cold and preserve it the way your method describes, and note the time it was collected.
Why does a digested tube sometimes turn green?
Dichromate is orange, and as it oxidises organic matter it is reduced to green chromium(III). A tube that turns fully green has used up its oxidant, so the sample is diluted and run again.
Other Water and Wastewater Test Equipment
- COD Digester (block digester with air condensers)
- COD Digestion Apparatus (block-heated, with glass vessels)
- B.O.D. Incubator
- Flocculator Jar Test Apparatus
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Last updated: 6 November 2026
