The CSY series pesticide residue detector adopts the latest national standard method and quantitatively analyzes the unknown concentration sample and the known concentration standard substance according to the principle of Lambert-Beer law. The expression of Lambert-Beer law is as follows: A=-logτ= abc
Where: A - the absorbance of the substance; Ï„ - the transmittance of the substance; a - the absorption coefficient of the substance; b - the length of the optical path c - the concentration of the substance.
The instrument consists of LED cold light source, colorimetric pool, photodetector, photoelectric sensor, microprocessor and micro printer. It can directly display the content of harmful substances in the sample to be tested on the LCD screen, and print out the analysis results. It is connected to the computer through the USB interface and is monitored, summarized, analyzed and monitored through the monitoring network system.
. Instrument functions and features
3.1, a multi-purpose machine, rapid quantitative detection of pesticide residues in food.
3.2. Ten-channel optical path system, simultaneous detection of ten samples.
3.3. Adopt new instrument structure design, no mechanical moving parts, anti-interference, anti-vibration, high detection precision and long instrument life.
3.4, large-screen color LCD Chinese display, user-friendly operation interface, accurate and intuitive reading.
3.5. It adopts USB interface design to facilitate the storage and movement of data, and can be directly connected with the computer at any time to realize data query, browsing, analysis, statistics, printing and publishing information.
3.6. High degree of intelligence: The instrument can automatically diagnose system faults.
3.7. Automatically save the test results, the data storage is large, and the built-in micro printer can print the test results in real time.
3.8. Provide complete accessory configuration, adopt beautiful and durable aluminum alloy packaging box.
3.9. Built-in large-capacity rechargeable battery can work continuously for 4 hours without external power supply.
3.10, convenient sample preparation
4. CSY-N8 pesticide residue detector instrument main technical indicators
4.1, absorbance accuracy: ± 2.0%
4.2, linearity error: ±1.0%
4.3, absorbance repeatability: ± 0.005
4.4, communication interface: USB
4.5, power: power adapter (input 120 ~ 240VAC, frequency: 50 ~ 60HZ; output DC5V / 3A)
4.6, instrument working environment:
4.7. Detection range and detection limit:
Detection range 0-100%
Lower detection limit 0.2-3.0mg/L (organophosphorus and carbamate)
1. Blank preparation: extract 2.5 ml of extract + 100 μl of enzyme + 100 μl of color developer (for 15 minutes at 30 ° C), then pour 100 μl of the substrate into a cuvette and place In the first channel of the instrument (blank must be operated in the first channel) Note: The instrument should be re-created with a blank value after rebooting.
2. Sample detection Take 1g sample and cut it, soak it with 5ml extract for 10 minutes (if there is oscillator, the ultrasonic time can be shortened to about 2 minutes)... Take 2.5ml soaking solution + 100μl enzyme + 100μl The toner (cultured at 30 ° C for 15 minutes), shake 100 μl of the substrate into a cuvette and place it in the instrument.
When the inhibition rate is ≥50%, it means that the organophosphorus or carbamate pesticide in vegetables exceeds the national standard, and the sample with inhibition rate ≥50% needs to be repeatedly tested twice or more.
Blank control test:
Step 1: Press the "Calibrate" button.
Step 2: Open the instrument door, place the cuvette containing the control solution into the designated channel, cover the instrument cover, press the “blank†button, and the instrument will perform a blank detection countdown.
Step 3: After the blank control test is finished, the instrument automatically displays the blank sample control test result Ao, and opens the instrument cover to take out the control.
test sample;
Step 1: Press the "Calibrate" button.
Step 2: Open the instrument door, place the cuvette containing the sample solution into the designated channel, cover the instrument cover, press the “Test†button, and the instrument will count down the sample test.
Step 3: After the test is finished, the instrument automatically displays the test result Ai of the pesticide test sample in the designated channel. The instrument automatically saves the control value and the test result, and opens the instrument cover to take out the sample.
[Note] The inhibition rate of the sample is between 40% and 50%. It is a suspected pesticide residue exceeding the standard. If the inhibition rate is still greater than 50% after repeated several times, the pesticide residue exceeds the standard, indicating that the pesticide residue of the sample may exceed the safety. The definition of the standard, it is recommended to use gas chromatography and other instruments for further testing.
Test result printing: On the screen showing the results of the pesticide residue detector , press the “Print†button and the instrument starts printing.
2. The result of the determination was expressed by the degree of inhibition of the enzyme (inhibition rate).
When the vegetable sample extract inhibits the enzyme by ≥ 50%, it means that the vegetable contains organic phosphorus or carbamate pesticide. Samples with an inhibition rate of ≥ 50% need to be repeatedly tested more than 2 times.
For samples with inhibition rate ≥50%, other methods can be used to further determine the specific pesticide variety and content.
3. Technical indicators of enzyme inhibition method (1) Sensitivity index The minimum detection limit of enzyme inhibition rate method should reach the following indicators: methylamine phosphate 0.8mg/L, trichlorfon 0.25mg/L, carbofuran 0.002mg/L.
(2) The coincidence rate is more than 80% in the samples of 10 or more samples with the detected inhibition rate ≥ 50%, verified by gas chromatography.
Special Note:
1. After the pesticide residue detector is turned back on, the blank value must be recreated.
2. Reagent preservation and precautions [blank preparation] Extract 2.5 ml of extract + 100 μl of enzyme + 100 μl of color developer (for 15 minutes at 30 ° C), then pour 100 μl of the substrate into the mixture. The cuvette can be placed in the first channel of the instrument (the blank must be operated in the first channel). Note: Re-create the blank value after the instrument is restarted.
[Sample test] Take 1g sample and cut it with 5ml extract for 10 minutes (if there is oscillator, the ultrasonic time can be shortened to about 2 minutes)... Take 2.5ml soaking solution + 100μl enzyme + 100μl The toner (cultured at 30 ° C for 15 minutes), shake 100 μl of the substrate into a cuvette and place it in the instrument.
When the inhibition rate is ≥50%, it means that the organophosphorus or carbamate pesticide in vegetables exceeds the national standard, and the sample with inhibition rate ≥50% needs to be repeatedly tested twice or more.
The company's products have passed ISO9001 quality system certification.
The company passed ISO14001 environmental system certification
The company's products have obtained a number of national patent certificates.
Company products obtained computer software copyright
Core Technology: own brand deep Fen instrument, made in China, patented products, technical support
Transportation guarantee : high quality EPE pearl cotton cushioning material, cowhide corrugated paper, and fumigation-free wooden box meet the requirements of export and domestic transportation.
Warranty: one year instrument warranty and lifetime maintenance trustworthy!
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