Method and equipment for measuring chemical oxygen demand by photocatalytic oxidation process
A chemical oxygen demand and catalytic oxidation technology, applied in the direction of electrochemical variables of materials, etc., can solve the problems of large influence, poor correlation, poor adaptability of water samples, etc., and achieves less reagent consumption, low detection limit, and reliable operation. Effect
Inactive Publication Date: 2012-01-25
HEBEI SAILHERO ENVIRONMENTAL PROTECTION HIGH TECH
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However, the correlation with the standard method is poor, the water sample adaptability is poor, and it is greatly affected by the suspended matter in the water sample
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[0023] The invention is based on the electrochemical three-electrode principle and adopts the photoelectric catalytic oxidation method for rapid measurement. The specific method is to determine the chemically determined oxygen demand based on the measurement basis that the output current of the nanometer working electrode is proportional to the content of the organic matter concentration. The method for measuring chemical oxygen demand with photocatalytic oxidation of the present invention takes the following steps:
[0024] 1. Turn on the pump 5, inject the blank solution 1 into the dilution pool 11, turn off the pump 5 after 20s-40s, turn on the pump 6, and clean the measuring pool 14;
[0025] 2. Turn on pump 4, valve 8, and valve 9, inject blank solution 1 into dilution tank 11, turn off pump 4, valve 8, and valve 9 after 30s-150s, turn on pump 6, make blank solution 1 fill measuring tank 14, and record Current signal I 0 . After the measurement, turn on the pump 7 to di...
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The invention relates to a method and equipment for measuring the chemical oxygen demand by a photocatalytic oxidation process and belongs to the technical field of a method and equipment for monitoring the water quality. The method and the equipment are used for carrying out pollution monitoring on the water quality. The invention adopts the technical scheme that blank solution and liquid to be measured are respectively rapidly measured by three electrodes through the photocatalytic oxidation process, and current data differences of the blank solution and the liquid to be measured and the concentration of organic matter in the range of 0 to 200mg / L have a linear relation, so that the real-time detection of the concentration of the organic matter in water is realized; the measuring equipment consists of a liquid injection device, a measuring device and a data processing device; the measuring device comprises an ultraviolet lamp and a measuring tank; a working electrode, a reference electrode and a counter electrode are arranged in the measuring tank; and a tank side wall between the measuring tank and the ultraviolet lamp is a light window. The method adopted in the invention accords with the international standards, the measurement is rapid and accurate, the method has no pollution, a small using amount of a reagent and low detection limit, and is suitable for on-line measurement of a low-concentration sample. The equipment disclosed by the invention has a simple and reasonable structure, reliably operates and has high application value.
Description
technical field [0001] The invention relates to a monitoring method and equipment for measuring chemical oxygen demand in water by a photocatalytic oxidation method, and belongs to the technical field of water quality monitoring methods and equipment. Background technique [0002] Chemical oxygen demand (COD) is one of the important indicators for evaluating water pollution. At present, the main methods for online determination of COD include potassium dichromate oxidation method, permanganate index method and ultraviolet absorption method. The potassium dichromate method meets the requirements of the national standard, and the measurement results are accurate and reproducible. However, the online COD automatic monitoring instrument based on this method will consume expensive silver sulfate and toxic mercury sulfate and chromium ions in practical applications. , causing secondary pollution, and the heating and digestion time is long, the process is cumbersome, and the sensi...
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IPC IPC(8): G01N27/26
Inventor 马培羚安胜波贾晓亮李闯卢艳青李少华曹黎霞
Owner HEBEI SAILHERO ENVIRONMENTAL PROTECTION HIGH TECH