E-mail: michael@shboqu.com   |   Expert in Water Quality Measurement and Water Treatment Project

What principles and methods does the rapid total phosphorus detector use for detection?

by:BOQU     2021-12-01

The rapid total phosphorus detector adopts a large-size touch color screen design, which is easy to operate, beautiful in appearance, and longer service life; the detection process adopts a digestion colorimetric integrated tube, after the reaction, no need to transfer the liquid, the measurement is directly performed, and the detection process is simpler. The instrument can be widely used in emergency monitoring, sewage treatment, chemical medicine, third-party testing, food, printing and dyeing, and other industries, scientific research units, universities, colleges, and other institutions for wastewater testing.

Detection principle:

Digest the sample with potassium persulfate (or nitric acid-perchloric acid), and oxidize all the phosphorus contained in it to orthophosphate. In an acidic medium, orthophosphate reacts with ammonium molybdate to generate heteropoly acid in the presence of antimony salt, which is immediately reduced by ascorbic acid to form a blue complex. Determine the content of total phosphorus by detecting the absorbance of the sample.

The detection steps of the total phosphorus rapid detector:

1. Standard curve drawing:
a. Digestion: Prepare phosphate standard solutions of different concentrations in accordance with relevant requirements, add the corresponding digestion solution, and complete the digestion under the specified digestion conditions.
b. Color development: Add corresponding reagents to develop color.
c. Curve drawing: Measure the absorbance of each standard solution and draw the standard curve of total phosphorus. The special total phosphorus testing equipment has a built-in standard curve when it leaves the factory, so there is no need to make it yourself.

Sample testing:

a. Digestion: Take a certain amount of water sample as required, add the corresponding digestion solution, and complete the digestion under the specified digestion conditions.
b. Color development: Add corresponding reagents to develop color.
c. Detection: Use pure water as a reference to measure the absorbance of the sample, and find out the content of total phosphorus on the total phosphorus standard curve. The dedicated total phosphorus detection equipment will directly display the total phosphorus detection result after pressing the detection button, without conversion.

Performance characteristics of total phosphorus rapid detector:

1. Less reagent consumption, low operating cost, and strong anti-interference ability;

2. The measurement range is wide, and the range can be switched according to the actual situation of the water sample;

3. The intelligent design of fault self-diagnosis makes the management and maintenance of the instrument simple and convenient;

4. With a data output interface, it can be connected to a computer, and the measurement data can be transmitted to the computer;

5. The instrument comes with a thermal printer, which can directly print measurement data and historical data;

6. The measurement and digestion systems are designed separately, and the operation process can be carried out separately without affecting each other;

7. Automatic constant temperature control system. PID adjustment technology, constant temperature in the digestion process. High precision;

8.1 point to 7 point correction mode, automatic calculation of slope, intercept and correlation coefficient, high measurement accuracy;

9. Strong anti-interference ability, suitable for industrial sites, and can be used for monitoring of surface water and pollution sources;

10. The instrument has a built-in real-time clock, and each measurement record has a measurement time stamp, which is convenient for statistics and queries;

11. Large-capacity data storage, power-off protection design, to ensure that the instrument is not damaged and data records are not lost;

12. Double LCD display, large-screen LCD backlight display, 240*128 dot matrix, Chinese operation interface, humanized programming;

13. The instrument adopts a semiconductor cold light source illuminator, optical circuit design, strong anti-interference ability, high measurement data accuracy, and good stability.

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