Fascination About chemical oxygen demand
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Presently, most COD tests use potassium dichromate as being the oxidant. Potassium dichromate is usually a hexavalent chromium salt that is certainly vibrant orange in colour and is incredibly sturdy.
For its part, COT has long been the only real system that's been in the position to be perfected after some time, having said that, there was no transform inside the initial procedure, only modifications emerged during the detection technique.
Digest your samples and also a reagent blank. (The reagent blank is simply a sample of deionized water that’s handled click here similar to your genuine samples. You can also reuse the blank for as long as your reagent batch lasts.)
Khối lượng oxy cần thiết để oxy hóa một hợp chất hữu cơ thành dioxide cacbon, amonia và nước được thể hiện dưới dạng tổng quát là:
A fairly easy-to-use printout of our Directions includes each pack of vials and is chemical oxygen demand out there on our Web page.
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Method Summary – An aliquot with the sample is digested for two hours at one hundred fifty°C inside the existence of dichromate and sulfuric acid. The resulting solution is titrated to a coloured endpoint with ferroin indicator or read on a spectrophotometer at an acceptable wavelength.
However, only modifications from the detection devices are reviewed within the Evaluation of TOC. These systems are highly-priced, but they've got significant sensitivity, so it was pointless to execute more modifications.
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Nagel et al. [sixty two] outline BOD5 for a measure with the natural contamination from the water that may be biologically degraded. It corresponds to the level of oxygen present divided in between the system's volume; it is normally expressed in milligrams of O2 for every liter.