The 2-Minute Rule for chemical oxygen demand test
The 2-Minute Rule for chemical oxygen demand test
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There are lots of methods for measuring COD, Every with its advantages and disadvantages. The most common techniques incorporate the dichromate strategy, the permanganate strategy, as well as the shut reflux technique.
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As a result, COD tests supply a extra precise estimate of the whole level of organic and natural compounds in h2o.
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It is inaccurate and it has a small Restrict of detection. Consequently, it truly is inapplicable to river samples which are clear and uncontaminated.
Most pre-well prepared COD vial distributors could have a return coverage for employed COD vials to ensure applied vials is usually returned to The seller sealed in the original containers for appropriate disposal.
In case the wastewater sample is tested at whole energy, then two ml is added towards the corresponding vial. If dilution is required, then serial dilutions are performed and 2 ml website from the diluted sample are added towards the corresponding vial.
A substantial amount of COD within a wastewater remedy plant implies that the wastewater includes too much material that may be oxidised and reduce the DO of your waterbody, When the effluent is discharged.
Large COD degrees signify a significant volume of oxidizable organic and natural content in the answer, which often can decrease the amount of dissolved oxygen accessible for aquatic lifestyle.
Normal technique scaling utilizes exactly the same highly poisonous reagents; Nonetheless, a diminishing of volumes of reagent essential as well as the processing time of standardized technique make it possible for minimizing the influence of squander era. Also, expenses are lessened even though getting statistically similar success.
Then again, only modifications while in the detection programs are mentioned within the analysis of TOC. These systems are costly, but they have superior sensitivity, so it had been needless to execute even further modifications.
Chemical oxygen demand, or COD, implies the level of oxygen that could be employed by processes in the measured Option. It is frequently get more info expressed as the mass of oxygen utilised for each unit of Alternative quantity, or milligrammes for each litre (mg/L) in SI units.
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