What Does chemical oxygen demand Mean?
What Does chemical oxygen demand Mean?
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Prepare the reagent blank by removing the COD vial cap and pipetting deionized h2o rather then sample into the vial.
This oxidation is catalyzed by silver sulfate. The catalyst is necessary, especially to oxidize very low molecular body weight fatty acids. The oxidation because of the acidified dichromate could be represented by the following equation:
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BOD and COD are important in wastewater for identifying the amount of waste while in the water. Waste that's high in organic make a difference calls for remedy to lower the amount of natural and organic squander before discharging into receiving waters.
Protected the cap onto Every single COD vial. Ensure never to overtighten the cap because it could problems the closure.
The 5-day completion window is surely an inherent drawback of your test for the reason that wastewater remedy procedure staff can not use it for making actual-time operational changes.
The colorimeter or spectrophotometer will be the machine that is going to study the absorbance from the samples right after digestion so that you can correlate it for the COD focus. Colorimeters use filters to evaluate gentle as precise wavelengths, but spectrophotometers use a tool that enables measurement throughout a wide spectrum.
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:
Electrodes: Electrodes are necessary factors of electrochemical measurements. They are usually fabricated from conductive components, for check here example metals or metallic oxides, and therefore are designed to connect with the analyte of desire.
An prolonged UBOD (ultimate BOD) test that steps oxygen intake right after 60 days or even more is usually necessary in wastewater permits.
It will involve the oxidation of organic and inorganic carbon compounds existing inside a water sample at superior temperatures.
Assure all caps are secured tightly, then invert Each and every vial a number of times. Bear in mind that scorching vials may perhaps shatter if dropped or cooled speedily.
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When COD is current, the chemical oxidation of natural and organic make any difference is accelerated with no require for added products.