chemical oxygen demand Things To Know Before You Buy
chemical oxygen demand Things To Know Before You Buy
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COD is the preferred alternate test to BOD for establishing the focus of natural and organic make a difference in wastewater samples.
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The COD test need to be viewed as an unbiased evaluate on the natural subject within a wastewater sample rather then a substitute for your BOD test.
COD Examination includes the use of a robust oxidizing agent to oxidize the natural and organic compounds from the sample, as well as the consumed oxidizing agent is then calculated to find out the COD benefit.
Do có nồng độ cao trong phần lớn các loại nước thải nên chloride thông thường là nguồn quan trọng nhất trong việc gây nhiễu. Phản ứng của nó với dicromat kali như sau:
Besides modifying the reagents of the original system, other authors have preferred to operate the detection method specifically or indirectly by measuring the percentage of organic and natural issue in water with specific sensors, approaching the COD. Many of these detection solutions consist of chemiluminescence (CL) and fluorescence; the main 1 is undoubtedly an environmentally check here friendly method than when making use of it, Cr3+ is produced all through COD reagents reaction, that's calculated get more info during the presence of the luminol-H2O2 mixture.
Other methods like thermal biosensors use sensors to observe COD on line at extensive-phrase in water samples. The biosensor measures the level of heat generated throughout the oxidation of natural matter.
The largest challenge with quite a few of the alternate options is their substantial Charge and time they require compared With all the standardized process.
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The ultimate DO reading is then subtracted in the First DO examining and The end result is the BOD concentration (mg/L). When the wastewater sample essential dilution, the BOD focus reading through is multiplied via the dilution aspect.
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