CN203132995U - Rapid pesticide residue tester - Google Patents

Abstract

The utility model relates to the field of detection of pesticide residues in agricultural products, in particular to a rapid detector for pesticide residues. It includes a housing, an optical signal generating device inside the housing for generating an optical signal passing through the sample to be detected, a photoelectric signal conversion device for converting the optical signal generated by the optical signal generating device into an electrical signal, and The chip is used to obtain the pesticide residue concentration according to the electrical signal; the optical signal generating device includes a light source and a cuvette mounting hole for containing the sample to be detected; the light source, the cuvette mounting hole and the photoelectric signal conversion The devices are arranged sequentially in a straight line. The rapid pesticide residue detector is small in size, easy to carry, and can detect pesticide residues in agricultural products in real time.

Description

A rapid pesticide residue tester

technical field

The utility model relates to the field of detection of pesticide residues in agricultural products, in particular to a rapid detector for pesticide residues.

Background technique

During the growth process of agricultural products, pesticides need to be used to kill insects, weeds, and sterilize, etc. After the agricultural products are picked and distributed to the market, it is very important to test the agricultural products for pesticide residues.

At present, the detection equipment used for the detection of pesticide residues in agricultural products is a chromatograph. The chromatograph is a large-scale analytical instrument. In addition to detecting pesticide residues, it can also be used for atmospheric water pollutant analysis and drug analysis. Therefore, the chromatograph is relatively large and is often placed in the laboratory.

However, before agricultural products enter the market, pesticide residue detection needs to be carried out in real time to reduce the time consumed before the agricultural products go on the market. However, the chromatograph is large in size and inconvenient to carry. Detect pesticide residues in agricultural products.

Utility model content

The purpose of the utility model is to provide a quick measuring instrument for pesticide residues, which is easy to carry.

In order to achieve the above object, the technical solution of the utility model is achieved in that:

A pesticide residue rapid detector, comprising a housing, an optical signal generating device located in the housing for generating an optical signal passing through a sample to be detected, and converting the optical signal generated by the optical signal generating device into an electrical signal A photoelectric signal conversion device and a chip for obtaining the pesticide residue concentration according to the electrical signal;

The optical signal generating device includes a light source and a cuvette installation hole; the light source, the cuvette installation hole and the photoelectric signal conversion device are arranged sequentially in a straight line.

Compared with the prior art, the utility model has the advantage that: the pesticide residue rapid detector includes a casing and the following devices located in the casing: an optical signal generating device, a photoelectric signal conversion device and a chip. Wherein the optical signal generating device comprises a light source and a cuvette installation hole, and the light source cuvette installation hole and the photoelectric signal conversion device are arranged in a straight line, and the reasonable arrangement makes the pesticide residue speed detector small in size and convenient to use. carry.

Description of drawings

Fig. 1 is the schematic diagram of the pesticide residue quick measuring instrument that the utility model embodiment provides;

2 is a schematic diagram of an optical signal generating device provided by an embodiment of the present invention;

Fig. 3 is the external structural diagram of the pesticide residue quick measuring instrument provided by the embodiment of the present invention;

Fig. 4 is the exterior view of the pesticide residue quick measuring instrument provided by the embodiment of the present invention;

Fig. 5 is a structural diagram of an optical signal generating device provided by an embodiment of the present invention;

6 is a schematic diagram of an optical signal generating device provided by an embodiment of the present invention;

Fig. 7 is a top view of the optical signal generating device provided by the embodiment of the present invention.

Detailed ways

The technical solutions of the various embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example 1

Before the pesticide residue rapid detector provided in this example detects the sample to be tested, first take 2 g of the fruit and vegetable agricultural product to be tested, add phosphate buffer solution with a pH of 7.4, ultrasonically extract for 7 minutes, and then let it stand for 1 minute. Take 2ml of the above sample extract and inject it into a cuvette, add 100ul of enzyme and substrate each, and let it stand for 3 minutes under temperature control at 25°C, then add 100ul of chromogenic agent, stand at temperature at 36-37°C for 3 minutes to obtain the test sample solution. The cuvette containing the sample solution to be tested is put into the cuvette mounting hole of the pesticide residue rapid tester, and then measured.

The detection method adopted by the rapid pesticide residue detector provided in this example is the enzyme inhibition rate method. The use of organophosphate and carbamate pesticides can specifically inhibit the activity of acetylcholinesterase in the central and peripheral nervous systems of insects, destroying the normal conduction of nerves and poisoning insects to death. If the sample extract does not contain the corresponding pesticide or the residual amount is extremely low, and the enzyme activity is not inhibited, the substrate will be hydrolyzed under the action of acetylcholinesterase (AChE), and the hydrolyzed product will react with the chromogenic agent to make the measured solution It is yellow in color and has a maximum absorption at 410nm. Conversely, if the sample extract contains a relatively high amount of corresponding pesticide residues, the enzyme activity will be inhibited, and the substrate will not be hydrolyzed or hydrolyzed very little, making the absorption of the measured solution weak at 410nm. The enzyme activity of different test solutions at 410nm is inhibited (indicated by inhibition rate) by using the pesticide residue rapid tester. The level of organophosphorus or carbamate pesticide content in the sample to be tested can be judged by the level of inhibition rate.

Specifically, as shown in FIG. 1 , the pesticide residue rapid detector of this embodiment includes a housing, an optical signal generating device 101 located in the housing for generating an optical signal passing through the sample to be detected, and a A photoelectric signal conversion device 102 for converting the optical signal generated by the optical signal generating device 101 into an electrical signal, and a chip 103 for obtaining the pesticide residue concentration according to the electrical signal.

As shown in FIG. 2 , the optical signal generating device 101 includes a light source 201 and a cuvette mounting hole 203 ; the light source 201 , the cuvette mounting hole 203 and the photoelectric signal conversion device 102 are sequentially arranged in a straight line.

The pesticide residue rapid detector includes a housing and the following devices located in the housing: an optical signal generating device 101 , a photoelectric signal converting device 102 and a chip 103 . Wherein the optical signal generating device 101 includes a light source 201 and a cuvette mounting hole 203, the light source 201, the cuvette mounting hole 203 and the photoelectric signal conversion device 102 are arranged in a straight line in sequence, and the reasonable arrangement makes the optical signal generate The volume of the device is small, and the pesticide residue quick detector only has the function of pesticide residue detection, without the complex functions of the existing gas chromatograph, so the volume of the pesticide residue quick detector is relatively smaller than that of the gas chromatograph, and is easy to carry.

In this embodiment, the pesticide residue rapid detector only has the function of pesticide residue detection, and the light source of the optical signal generating device, the cuvette mounting hole and the photoelectric signal conversion device are reasonably arranged, so that the pesticide residue rapid detector Small size, easy to carry. In order to reflect other features of the rapid pesticide residue detector, the pesticide residue rapid detector in Example 1 will be further described in Example 2 below.

Example 2

As shown in Fig. 1 and Fig. 3, the pesticide residue quick measuring instrument of this embodiment includes a housing 301, an optical signal generating device 101 located in the housing 301 for generating an optical signal passing through the sample to be detected, A photoelectric signal conversion device 102 for converting the optical signal generated by the optical signal generating device 101 into an electrical signal, and a chip 103 for obtaining the pesticide residue concentration according to the electrical signal.

As shown in FIG. 2 , the optical signal generating device 101 includes a light source 201 and a cuvette mounting hole 203 ; the light source 201 , the cuvette mounting hole 203 and the photoelectric signal conversion device 102 are sequentially arranged in a straight line.

Further, the optical signal generating device 101 also includes an optical filter 202; the optical filter 202 is located between the light source 201 and the cuvette installation hole 203, and is installed with the light source 201 and the cuvette The hole 203 and the photoelectric signal conversion device 102 are arranged in sequence in a straight line. The optical signal sent by the light source 201 is filtered by the optical filter 202, and then passes through the cuvette mounting hole 203, and the intensity of the optical signal is reduced. After receiving the optical signal, the photoelectric signal conversion device 102 converts the optical signal to The signal is converted into an electrical signal and transmitted to the chip 103 .

As shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6 and Fig. 7, in order to make the arrangement positions of the above-mentioned light source 201, optical filter 202, cuvette mounting hole 203 and photoelectric signal conversion device 102 fixed, as shown in Fig. 3, the optical signal generating device 102 further includes a fixing block 501;

The cuvette installation hole 203 is disposed on the fixing block 501 ; the housing 301 is provided with a first opening 302 , and the first opening 302 is matched with the cuvette installation hole 203 . After the cuvette contains the sample to be tested, it is placed in the cuvette installation hole 203 of the fixed block 501 .

The fixing block 501 is provided with a second hole and a third hole 505 communicating with the cuvette mounting hole 203; the central axes of the second hole and the third hole 505 are on a straight line;

The light source is located in the second hole, and the photoelectric signal conversion device is located on the outer surface of the fixing block 501 and covers the third hole 505 . That is, the light source is fixed in the second hole, and the light signal sent by the light source passes through the cuvette mounting hole and reaches the third hole 505. Since the photoelectric signal conversion device covers the third hole 505, the light signal passes through the third hole 505 reaches the photoelectric signal device. After receiving the optical signal, the photoelectric signal conversion device converts the optical signal into an electrical signal and transmits it to the chip.

Further, the fixing block 501 also includes a fourth hole 502 and a filter plate 503 placed in the fourth hole 502;

The filter plate 503 is provided with a fifth hole, and the fifth hole is in a straight line with the second hole and the third hole 505 ; the filter is located in the fifth hole of the filter plate 503 .

Further, the pesticide residue rapid detector also includes an output device 104 for outputting detection data; the output device 104 includes a display screen 305; the housing 301 includes a second opening; the display screen 305 is located at the first In the two openings, and electrically connected with the chip. After the chip receives the electrical signal, according to the electrical signal, the inhibition rate and the pesticide residue concentration of the sample to be detected are obtained, and then the inhibition rate and the pesticide residue concentration are sent to the display screen for display, so that the pesticide residue rapid tester can Real-time display of detection data.

Further, the output device 104 also includes an RS232 interface 402 and a USB interface 403; the RS232 interface 402 and the USB interface 403 are respectively electrically connected to the chip. The Pesticide Residue Rapid Tester can be connected to a computer via RS232 for data interaction. In addition, the pesticide residue quick tester can also be connected to a U disk through a USB interface to store data.

Further, the pesticide residue quick tester also includes an input device; the input device includes four buttons 306; the four buttons are located on the casing 301 and are electrically connected to the chip. Four buttons can set the parameters of the pesticide residue quick tester.

Further, the pesticide residue quick tester also includes a power supply unit; the power supply unit includes an external power supply interface 401 for connecting to an external power supply and a built-in power supply unit for connecting to a battery. When the pesticide residue rapid tester is working, it can be powered by an external power adapter, or it can be powered by four batteries.

In addition, the pesticide residue rapid detector further includes an upper cover 303 for covering the first opening 302 of the housing 301 ; the upper cover 303 is rotatably connected with the housing 301 . After the cuvette is placed in the cuvette installation hole 203, the upper cover 303 covers the first opening 302 to prevent external light from affecting the optical signal generated by the optical signal generating device.

Preferably, the light source is an LED lamp that generates a light beam with a wavelength of 410 nm.

The pesticide residue quick detector described in this embodiment is small in size and easy to carry, so it can be applied not only in agricultural product wholesale markets and agricultural product production bases, but also in villages, public canteens and other places for real-time detection to ensure that people get healthy and safe agricultural products.

The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any skilled person who is familiar with the profession can use the above-mentioned The disclosed technical content makes some changes or modifications to equivalent embodiments of equivalent changes, but any simple modifications and equivalent changes made to the above embodiments according to the technical essence of the present utility model do not deviate from the content of the technical solution of the present utility model and modifications, all still belong to the scope of the technical solution of the utility model.

Claims (10)

1. pesticide residue rapid detector, it is characterized in that, comprise housing, be positioned at described housing the optical signal generating apparatus for generation of the light signal that sees through detected sample, be used for that the light signal that optical signal generating apparatus produces is converted to the photosignal conversion equipment of electric signal and be used for obtaining according to described electric signal the chip of residues of pesticides concentration;

Described optical signal generating apparatus comprises light source and cuvette mounting hole; Described light source, cuvette mounting hole and described photosignal conversion equipment are linearly arranged successively.

2. pesticide residue rapid detector as claimed in claim 1 is characterized in that, described optical signal generating apparatus also comprises optical filter;

Described optical filter and is linearly arranged with described light source, cuvette mounting hole, photosignal conversion equipment between described light source and described cuvette mounting hole successively.

3. pesticide residue rapid detector as claimed in claim 2 is characterized in that, described optical signal generating apparatus also comprises fixed block;

Described cuvette mounting hole is arranged on the described fixed block; Described housing is provided with first opening, and described first opening cooperates with described cuvette mounting hole;

Described fixed block is provided with second hole and the 3rd hole that is communicated with described cuvette mounting hole; The central axis in described second hole and described the 3rd hole point-blank;

Described light source is positioned at described second hole, and described photosignal conversion equipment is positioned at the lateral surface of described fixed block and described the 3rd hole is covered.

4. pesticide residue rapid detector as claimed in claim 3 is characterized in that, described fixed block also comprises the 4th hole and the filter that is placed in described the 4th hole;

Described filter is provided with the 5th hole, and described the 5th hole and described second hole, the 3rd hole are point-blank; Described optical filter is positioned at the 5th hole of described filter.

5. pesticide residue rapid detector as claimed in claim 4 is characterized in that, also comprises the output unit for output test data;

Described output unit comprises display screen; Described housing comprises second opening;

Described display location and is electrically connected with described chip in described second opening.

6. pesticide residue rapid detector as claimed in claim 5 is characterized in that, described output unit also comprises RS232 interface and USB interface;

Described RS232 interface and USB interface are electrically connected with described chip respectively.

7. pesticide residue rapid detector as claimed in claim 6 is characterized in that, also comprises input media;

Described input media comprises four buttons; Four described buttons are positioned on the described housing and with chip and are electrically connected.

8. pesticide residue rapid detector as claimed in claim 7 is characterized in that, also comprises supply unit;

Described supply unit comprises for the external power interface that is connected with external power source and the built-in power device that is used for being connected battery.

9. pesticide residue rapid detector as claimed in claim 8 is characterized in that, also comprises the loam cake that covers for first opening with described housing;

Described loam cake is rotatably connected with described housing.

10. as each described pesticide residue rapid detector in the claim 1～9, it is characterized in that described light source is the LED lamp of the light beam of 410nm for producing wavelength.

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