Adsorption material testing

This standard specifies the method for determining the chemical oxygen demand in water. This standard is applicable to various types of water samples with COD values greater than 30mg/L. The upper limit for the determination of undiluted water samples is 700mg/L. This standard is not applicable to chloride concentrations greater than 1000mg/ L. Diluted saline water. 2. Define the mass concentration of oxygen in the water sample corresponding to the dissolved substance and suspended substance consumed by the dichromate salt under certain conditions when subjected to potassium dichromate oxidation treatment. Principle 3: Add a known amount of potassium dichromate solution to the water sample, and use silver salt as a catalyst in a strong acid medium. After boiling and refluxing, titrate the unreacted potassium dichromate in the water sample with ammonium ferrous sulfate as an indicator, and calculate the mass concentration of oxygen consumption from the amount of ammonium ferrous sulfate consumed. Under acidic potassium dichromate conditions, aryl and pyridine are difficult to oxidize, and their oxidation rate is relatively low. Under the catalysis of silver sulfate, linear aliphatic compounds can be effectively oxidized

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