Portable pesticide residue rapid testing instrument

The NC-120 pesticide residue rapid detection instrument is a specially designed rapid detection instrument based on the national standard method of rapid detection card method (paper method). Mainly used for rapid detection of organic phosphorus and carbamate pesticides in vegetables, fruits, tea, grains, water, and soil, especially suitable for field testing before picking in agricultural product testing stations, fruit and vegetable production bases, and professional households, on-site testing in agricultural wholesale sales markets, agricultural product procurement and distribution centers, and safety testing before processing in restaurants, canteens, and household fruit and vegetable tea.

1、 Technical indicators:
Number of measurement channels: 12
Standard temperature: 39 ℃ Temperature optional range: 30 ℃~50 ℃
Reaction time: 10 minutes Optional range: 0-60 minutes
Color rendering time: 3 minutes, optional range: 0-60 minutes
The power adapter: AC220V50HZ/DC5V 2A
Rechargeable lithium battery: 3.6V/2Ah, working time about 100-150 minutes, charging and discharging about 500-1500 times

2、 Detection principle:
The detection principle of the rapid testing instrument is to use the acetylcholinesterase (white tablet) in the rapid testing card to catalyze the hydrolysis of indophenol acetate (red tablet) into acetic acid and indophenol (blue). Due to the inhibitory effect of organic phosphorus and amino acid ester pesticides on acetylcholinesterase activity, the color development after catalytic hydrolysis changes. Based on the different color developments, the residual situation of organic phosphorus or amino acid ester pesticides in the sample can be determined.

3、 Instrument functions

Advanced microcomputer control technology with high precision in temperature and time control.

12 detection channels, capable of measuring 12 samples at a time.

LCD digital display, clear at a glance.

Heating, constant temperature, and timing functions.

Fast heating technology, fast measurement speed, reaction time of 10 minutes, color reaction time of 3 minutes to produce results.

Ultra high capacity rechargeable lithium battery with long battery life, convenient for on-site testing; Equipped with battery level indicator and low battery alarm function, timely grasp the battery level situation.

Provide car power interface.

Complete detection accessories, beautiful and sturdy aluminum alloy password box.

1. Select representative vegetables or fruit peels, wipe off the surface soil, cut them into a square size of about 1 centimeter, take 5 grams and put them into a covered bottle, add 10 milliliters of pure water or buffer solution, shake 50 times (if conditions permit, users can equip an ultrasonic cleaner to stir), and let them stand for more than 2 minutes.
Note:
(1) Generally, 11 test samples are made for each batch, and a blank control is made by adding purified water or buffer solution dropwise.
(2) After cutting each sample, the scissors should be cleaned before processing the other sample to avoid cross contamination.
If the testing is carried out at the sampling site or under simple conditions, 2-3 drops of eluent can be directly dropped on the tip of the vegetable leaves to be tested (the pesticide rapid testing card in the box comes with it), and another leaf tip can be gently rubbed at the drip point to fully dissolve the residual pesticides on the surface of the vegetable into the eluent.

2. Testing:

Take the sample liquid with a dropper and drip it2Drop left and right onto the white pill on the card;
After all the samples in this batch have been dripped, press Key, start reacting10Countdown in minutes, at this time, the upper cover should be in the open state. If the lid is accidentally closed, the instrument will emit a long peak sound until the lid is opened.
reaction10After minutes, the instrument will emit a prompt sound. At this time, you can close the cover and wait for it to proceed3The color reaction lasts for minutes. When the instrument emits a prompt sound, open the instrument cover and determine the result.

3. Result judgment
White pills that do not change color or have a slight light blue color are both positive results, indicating a high level of pesticide residue;
A light blue color indicates a weak positive result, suggesting a relatively low level of pesticide residue; If the white pill turns sky blue or matches the color of the blank control card, it is a negative result.
Preparation of standard color card (blank control): Each batch of determination should have a blank control card for the eluent, which does not contain pesticides. The blue color displayed on the control card can be used as a reference for the same batch of samples.