ZDS-100 portable pesticide residue speed meter instruction manual

food safety

Quick test series product manual

ZDS-100 portable pesticide residue speed measuring instrument

First, the instrument overview

ZDS-100 portable pesticide residue speed measuring instrument is specially designed according to the national standard method---speed measuring card method (paper method). It is mainly used for rapid detection of organophosphorus and carbamate pesticides in fruits, vegetables, tea, grain, water and soil. It is especially suitable for on-site law enforcement use by food safety testing agencies at all levels. It can also be used in fruit and vegetable tea production bases and farmers. Wholesale sales market on-site speed measurement, restaurants, canteens, safe measurement of family fruits and vegetables before processing.

Second, the detection principle

The detection principle of the instrument is to control the parameters such as temperature and time by using single-chip microcomputer, and the total amount of organic phosphorus and carbamate pesticides in foods such as vegetables and fruits can be quickly and semi-quantitatively determined by the difference of color of biochemical reaction results with acetylcholinesterase rapid test card. Quantitative testing. The principle of biochemical reaction is: the cholinesterase (white tablet) in the rapid test card can catalyze the hydrolysis of indole phenol acetate (red tablets) to acetic acid and indophenol, due to the organophosphorus and carbamate pesticides to cholinesterase. The activity is inhibited, and the color development after catalytic hydrolysis is changed. Therefore, based on the depth of the resulting color, the residual of the organophosphorus or carbamate pesticide in the sample can be judged.

Third, the main performance parameters and specifications of the instrument

l Measurement channel: 10 channels

l Constant temperature: 40 °C Optional range: 30-50 ° C

l Reaction time: 10 minutes Optional range: 0-60 minutes

l Color development time: 3 minutes Optional range: 0-60 minutes

l Power adapter: Input 100-240VAC 50/60Hz 0.4A

l Rechargeable lithium battery: 3.6V/1400mAh, working time 60-150 minutes

Fourth, the instrument structure

Five, with the quick test box card supporting detection steps

1 , boot and card

l Press and hold the “On/Off” button on the panel for about two seconds, and the instrument will be turned on. At this time, the instrument will warm up and the highlight will flash. (At this time, press “Mode” to display the current temperature);

l During the preheating process of the instrument, the quick test card can be folded in half along the center line, and then the film is removed, and then inserted into the bottom plate of each channel under the bead (note that one end of the red pill is above and the end of the white pill is below).

l When the bright spot stops flashing, it indicates that the warm-up is completed.

l (When turned on, press and hold the “On/Off” button for about two seconds to turn it off.)

2 , sample processing

l Sample processing method 1 : 2-3 drops of eluate in the proximal tip of the tested leaf, and gently rub with the other leaf tip (the same batch) at the drip for about 1 minute, then the leaf Drop a drop of the liquid on the white pill;

l Sample processing method 2 : Take about 5 grams of vegetables or fruit samples, cut into the size of the fingernails with scissors, put them into plastic or glass beakers, add water according to 1:1 ratio (leaf vegetables add water in a ratio of 1:2). Stir with a glass rod and take a drop on a white pill after 10 minutes.

3 , heating, color development

l After the samples to be tested are dripped onto each tablet, press the “Start” button, the instrument will display 10:00, and count down to start the test. Note that the cover cannot be closed at this stage ;

l After 10 minutes, the instrument will give a prompt buzzer sound. At this time, please close the top cover, the LCD display heating countdown, the color development time (3 minutes) will arrive, the instrument will give a three-tone beep sound, then open. The upper cover of the instrument judges the result.

4 , the result of judgment: observe the color of the white pill on the quick test card, if displayed

l Significant blue is negative, indicating no pesticide residues or low concentrations;

l Light blue is weakly positive, indicating pesticide residues and high concentrations;

l White is strongly positive, indicating pesticide residues and high concentrations;

Blank control color:

A drop of eluate was dropped on the white plate of the one-speed test card, and the blue color after the reaction according to the above steps was the standard control color without pesticide.

Sixth, instrument maintenance

1. The place where the instrument is stored must be kept dry, dust-free and vibration-free.

2. The internal passage of the instrument should be kept clean and free of dust. If there is dirt, it can be wiped clean with cotton.

3. If the instrument is not used for a long time, the lithium battery should be taken out and stored in a dry place to prolong the service life of the instrument;

Seven, matters needing attention

1. When using the instrument for the first time, the lithium battery should be fully charged, which takes about 8 hours.

2. If the instrument prompt is not lit, it indicates that the current battery is low, it should be charged in time, otherwise the instrument will automatically shut down.

3. When preheating, the upper cover of the instrument is preferably covered to reduce the warm-up time;

4. When the instrument is not in use, it should be turned off to save power; after the instrument is turned off, if the power adapter is powered, the power indicator will be on, if it flashes, the lithium battery is charging.

5. It is forbidden to insert other DC0 power supplies not equipped with the company in the DC input hole of the instrument.

6. If the instrument does not respond when pressing the “On/Off” button, insert the small probe into the “RESET” hole at the bottom of the instrument and press the “Reset Switch” button to return the instrument to normal.

7. Onions, garlic, radish, leeks, celery, coriander, white peony, mushroom and tomato juice contain plant secondary biomass that has an effect on the enzyme, which is prone to false positives. When processing such samples, whole body (body) vegetable extraction or surface measurement may be employed.

8. The white pill and the red pill need to have enough water for the medium to react with each other. It is better to treat the samples in each batch and then add them together to avoid drying out.