1、 Product Principles
According to the insect toxicology principle that organophosphorus and carbamate pesticides can inhibit the activity of Acetylcholine enzyme in the central and Peripheral nervous system of insects, cause the accumulation of nerve conduction medium Acetylcholine, affect normal transmission, and make insects poisoned to death, it is used in the detection of pesticide residues. If the vegetable extract does not contain organophosphorus or carbamate pesticides or the residue is low, the enzyme activity will not be inhibited, the substrate added in the test will be hydrolyzed by Enzymatic hydrolysis, and the hydrolysate will react with the added developer to produce color. On the contrary, if the vegetable extract contains a certain amount of organic phosphorus or carbamate pesticide enzyme activity will be inhibited or partially inhibited, the substrate added in the test will not be hydrolyzed by Enzymatic hydrolysis or a small part will be hydrolyzed, so there will be no color development or little color change. Use a spectrophotometer to measure the change of absorbance value with time to calculate the inhibition rate, Then we can judge whether there are organophosphorus or carbamate pesticide residues in vegetables.
2、 Test items
Pesticide residues, nitrate, nitrite, heavy metals (chromium, cadmium, mercury, arsenic, lead), formaldehyde, sodium formaldehyde and sulfur dioxide in fruits and vegetables.
3、 Performance characteristics
1. Multi channel testing technology can simultaneously detect multiple samples.
2. Adopting large screen LCD backlight display and Chinese guided operation.
3. Communication.
4. Using LED lights as the light source and silicon semiconductors as the signal receiving system, the lifespan can reach up to 100000 hours.
5. Built in thermal printer for storing and printing test results.
6. It has the ability to automatically save detection results and query saved records.
7. With reaction time setting and qualification standard setting. The host can automatically determine whether the detection results are qualified.
8. It can be connected to a computer or used alone, and can share data and reports through a data cable. It also has functions such as storage, collection, processing, and evaluation.
9. Built in water bath pot, automatic control of cultivation time and temperature.
4、 Technical parameters
1. Sensitivity: Potassium dichromate solution ≥ 3.17 × 10 (A/ug. ml), Copper(II) sulfate solution ≥ 4.50 × 10 (A/ug. ml)
2. Stability: After preheating for 20 minutes, the drift (T) value of the photocurrent does not change by more than 1.0% within 3 minutes, and the linear error is ≤ ± 3%
3. Repeatability error: absorbance (A) ≤ 0.005
4. Wavelength range: 412nm, 505nm
5. Measurement range of inhibition rate: 0-100%
6. Transmission accuracy: ± 0.4%
7. Transmission specific gravity repeatability: ≤ 0.3%
8. Suppression rate indication error: ± 5%
9. Repeatability of inhibition rate: ≤ 3%
10. Channels: 6
11. Working environment: The room temperature is around 20 degrees Celsius, and the humidity is not more than 85%.
12. Instrument size: 380 × two hundred and thirty × 110mm
13. Seismic resistance: qualified
5、 Product configuration (two aluminum alloy password boxes: 490 × three hundred and five × 165mm, net weight 10Kg)
Instrument box: host, electronic balance, cuvette, communication software, communication line, Pipette, power line, etc.
Medicine box: triangle bottle, Volumetric flask, funnel, measuring cylinder, reaction bottle, aluminum box, bottle washing, 1 set of medicine, etc.
