Product Description 1. Instrument Introduction
Biochemical oxygen demand D is a must-measure item for water quality evaluation and an important quality indicator for measuring water pollution caused by organic matter. The traditional determination method of D adopts the chemical dilution method. This method is cumbersome to operate and requires high experimental skills of analysts. The large dispersion of experimental data often results in the inability to obtain accurate experimental results.
The direct-reading D meter is a new type of instrument that uses the air pressure difference method to measure biochemical oxygen demand. It is simple to operate and can provide accurate measurement results comparable to the chemical dilution method. It is intuitive to use and maintain, and is widely used. The monitoring of water quality in environmental monitoring, petrochemical industry, medical and health, teaching and scientific research and other departments is a powerful tool for the majority of analysts.
Inject the water sample or pretreated water sample into the culture bottle and put the carbon dioxide absorber () into the absorption cup at the mouth of the bottle. Then seal the culture bottle and place it in the biochemical incubator. When the sample to be tested is at ℃ After five days of incubation at a constant temperature, the water sample in the bottle undergoes a biological oxidation reaction at a certain stirring speed. Organic matter is converted into nitrogen, carbon and sulfur oxides and produces carbon dioxide gas, which is absorbed by sodium hydroxide. The oxygen in the upper space of the culture bottle continuously supplies the oxygen demand of the microorganisms in the water sample. A pressure difference is generated in the culture bottle and passes through the detection glass tube. The height of mercury in the water sample can be used to calculate the D value of the water sample within the specified measurement period.
2. Technical indicators:
, Ambient temperature: ℃ ~ ℃
, Measurement method: Differential pressure method
, Measuring range: /~/(required when the D value exceeds the measuring range dilution)
, batch processing volume: one water sample per time
, accuracy: in line with the national standard-standard regulations (the D value of glucose glutamate standard solution is within the range of /~/)
Display: The sample D value (/) can be read directly from the pressure gauge scale
, culture temperature: ℃℃
, power supply: AC
, host size:
, host Weight:
, Power consumption: Instrument
3. Preparation list:
D host machine, culture bottles, stirrers, absorption cups, mercury bottles, rubber transmission belts (large and small) strip), a sealing ring support, a fuse, and a power AC/DC converter.
), a sealing ring support, a fuse, and a power AC/DC converter.
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