HZJY880 Biochemical Oxygen Demａnd Meter BOD Analyzer

I. Instrument brief introduction and scope of use

Biochemical oxygen demａnd is BOD5 It is a necessary test project for water quality evaluation and an important quality index to measure organic water quality pollution.

Computer BOD5 Demeter microcomputer treatment, liquid crystal display, a new instrument of BOD measurement using air differential pressure method, can accurately provide the measurement results comparable with the chemical dilution method, directly display the BOD value, biochemical reaction curve is clear at a glance, is the most ideal instrument in the internal BOD measurement.It can be widely used in environmental monitoring, petrochemical, medical and health, teaching and research to monitoring water quality.

II. Working principle

1, B0D5 Basic principles

Definition

Biochemical oxygen demａnd (BOD5) Definition as aerobic microbial consumption and dissolution in water

The amount of oxygen, when samples in the incubator, was 20℃

At five days of culture, the amount of dissolved oxygen consumed was determined to determine the water sample

BOD values

Biochemical oxygen demａnd refers to the amount of dissolved oxygen consumed or needed to decompose organic substances in water through the reproduction and respiration of oxygen demａnd microorganisms in water under specific conditions.BOD in water5Values are usually expressed by the amount of dissolved oxygen consumed by the sample for 5 days at 20℃, noted as " BOD5"。

2, Determination principle

The mixer is placed in the incubator and pours the water sample of quantitative volume according to the preselected range and the measurement range and stirring continuously on the mixer.The temperature in the incubator was controlled at 20℃± 1℃ for five days after constant water temperature.Sufficient dissolved oxygen must be guaranteed in the culture bottle.The organic matter in the sample is biooxidized into oxides of nitrogen, carbon and sulfur, during which the only gas running from the water sample is absorbed by sodium hydroxide (or potassium hydroxide).Thus, the air pressure in the bottle decreases, equivalent to the amount of dissolved oxygen consumed by the microorganism, so that, the sample BOD5The value is proportional to the extent of air pressure reduction in the bottle, and BOD can be obtained by measuring the change in air pressure5Value.Increasing or decreasing the amount of samples taken can increase or decrease the pressure reduction value.This allows the operator to accurately measure a wide range of BOD without complicated dilution steps5Value.The change in air pressure in the culture bottle is detected by a semiconductor pressure sensor with the LCD display cycle showing the BOD of each sample5Values and biochemical reaction curves.

III. Main technical indicators

1, measurement range: 0 ~ 1,000 mg/L (BOD5Dildilution when values exceed the measurement range)

2, simultaneously determined the number of samples: 6 samples or 8 samples per time

3, accuracy: comply with the national standard "GB7488-87" provisions

(Glucose glutamate standard solution BOD5Value in the 180 mg/L~230 mg/L range)

4, display: The LCD display cycle displays the BOD of each sample5Values and biochemical reaction curves.

5, culture temperature: 20℃±, 1℃

6, power supply: AC 220V± 22V 50Hz±0.5Hz

7, power consumption: Instrument ≤ 50W, incubator ≤ 300W

8, instrument holds the BOD of the eight samples last analyzed5Values and biochemical reaction curves

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