CN202210072U

CN202210072U - Organophosphorus pesticide detector

Info

Publication number: CN202210072U
Application number: CN2011201818809U
Authority: CN
Inventors: 李乃瑄; 李继斌; 赵正亚
Original assignee: Tianjin University of Technology
Current assignee: Tianjin University of Technology
Priority date: 2011-06-02
Filing date: 2011-06-02
Publication date: 2012-05-02
Anticipated expiration: 2021-06-02

Abstract

An organophosphorus pesticide detector is an experimental instrument suitable for various people groups and capable of realizing rapid detection. The organophosphorus pesticide detector comprises a visible light source, optical filters, cuvettes, photoelectric cells, a data processing circuit, display equipment and a central control chip. Both the phosphorus molybdenum heteropoly acid-basic dye-surfactant sensitizer multicomponent color appearance system detection method and the Ag (I)-chromazurine S-polyvinyl alcohol spectrophotometry are adopted for detection. The design of the organophosphorus pesticide detector is based on the visible spectrophotometer principle, a light emitting diode is used as the light source, and narrow band filters are used as spectrophotometry equipment, so that the instrumental size and the cost are reduced; the visible light photoelectric cells are used as a receiver, so that the signal response time and the sensitivity are improved; and mathematical model based on reference data, molar absorptivity, temperature compensation data, linear data and other experiment parameters is written into the central control chip to fulfill the calculation function of the organophosphorus pesticide detector. Therefore, the organophosphorus pesticide detector can help various people groups to rapidly complete detection.

Description

The detection of organic phosphorus pesticide appearance

Technical field

The utility model is a kind of experimental apparatus that organophosphorus pesticide residual in the fruits and vegetables is detected, and especially goes for the layman and can carry out fast detecting.

Background technology

In recent years, owing to the organophosphorus pesticide of the agricultural product food poisoning that causes that exceeds standard happens occasionally, the healthy of people in serious threat.Especially fruit and vegetable etc. is eaten agricultural product raw, and the disease and pest in the growth course own is just relatively more serious, makes the agricultural chemicals use amount bigger, edible immediately after plucking in addition, its residues of pesticides to the healthy influence of people and harm more directly, more serious.According to World Health Organization's statistics, about 3,000,000 people of the annual pesticide poisoning number in the whole world, wherein organic phosphorus pesticide poisoning accounts for 70%, about 100,000 people of Chinese annual pesticide poisoning person.

So be necessary to research and develop a kind of quick, simple, accurate, highly sensitive and economic organophosphorus detector, the organophosphorus pesticide residual to fruit and vegetable surfaces carries out on-the-spot half-quantitative detection, thereby stops the generation of residues of pesticides poisoning.

Summary of the invention

The utility model purpose is to solve the residual organophosphorus pesticide of fruit and vegetable surfaces is carried out on-the-spot half-quantitative detection, thereby stops the problem that the residues of pesticides poisoning takes place, and a kind of detection of organic phosphorus pesticide appearance is provided.

The detection of organic phosphorus pesticide appearance that the utility model provides; Comprise visible light source, optical filter, cuvette, photoelectric cell, data processing circuit, display device and central control chip; Described optical filter is arranged between visible light source and the cuvette; Photoelectric cell is positioned on the light path of cuvette back, and photoelectric cell connects data processing circuit and display device successively through circuit, and visible light source, cuvette, photoelectric cell, data processing circuit and display device are connected central control chip respectively.

The design concept of the utility model

The technical scheme that the utility model adopts is: detector is that the method that detects organophosphorus pesticide with the polynary color development system detection method of phosphato-molybdic heteropolyacid-basic-dyeable fibre-surfactivity sensitizer and Ag (I)-chrome azurol S-polyvinyl alcohol (PVA) (PVA) AAS is a method for testing and detecting, carries out the detection of organophosphorus pesticide through using special detecting instrument.

The design of detecting instrument is according to the visible spectrophotometer principle, and design as light source, has avoided old-fashioned spectrophotometric light source to need the problem of preheating through the diode luminescence pipe, thereby reduces measuring period; Use narrow band pass filter as light-dividing device, significantly reduced instrument volume and cost; Use the visible light photoelectric cell as receiver, improved signal response time and sensitivity.Through the reference data of using singlechip technology to have got well through measuring; What a molar absorptivity, temperature compensation data, technical parameters such as linear data set up and detected data processing model; So just can simplify experimental implementation, can make things convenient for any crowd to use.

Advantage of the utility model and beneficial effect:

The design of the utility model is according to the visible spectrophotometer principle, and design as light source, has avoided old-fashioned spectrophotometric light source to need the problem of preheating through the diode luminescence pipe, thereby reduces measuring period; Use narrow band pass filter as light-dividing device, significantly reduced instrument volume and cost; Use the visible light photoelectric cell as receiver, improved signal response time and sensitivity.

Through the reference data of using singlechip technology to have got well through measuring, what a molar absorptivity, temperature compensation data, technical parameters such as linear data set up and detect data processing model.

The utility model can make fruits and vegetables detection of organic phosphorus pesticide appearance reach convenient and swift, and is with low cost, the characteristics that are applicable to any crowd simple to operate.

Description of drawings

Fig. 1 is a detection of organic phosphorus pesticide appearance theory diagram.

Fig. 2 is the table design reference view in the organophosphorus detector.

Fig. 3 is the vertical view of Fig. 2.

Fig. 4 is the side view of Fig. 2.

Fig. 5 is an amplifying circuit.

Fig. 6 is an analog to digital conversion circuit.

Among the figure, 1 visible light source, 2 optical filters, 3 cuvettes, 4 photoelectric cells, 5 data processing circuits, 6 display devices, 7 central control chips, 8 light holes.

Embodiment

As shown in Figure 1; The detection of organic phosphorus pesticide appearance that the utility model provides; Comprise visible light source 1, optical filter 2, cuvette 3, photoelectric cell 4, data processing circuit 5, display device 6 and central control chip 7; Described optical filter is arranged between visible light source and the cuvette; Photoelectric cell is positioned on the light path of cuvette back, and photoelectric cell connects data processing circuit and display device successively through circuit, and visible light source, cuvette, photoelectric cell, data processing circuit and display device are connected central control chip respectively.

It is critical piece that visible light source is to use white light emitting diode, and white light is a hybrid light source, helps the extraction to required wavelength light source like this.

Optical filter can the light source filtering of mixed wavelengths is invalid wavelength.What in the utility model, use is arrowband type optical filter, and such optical filter can make a superfine wave band pass through, and other invalid wave band will be filtered out, and purpose is to improve to detect effect, reduces the detector volume.

Cuvette is special cuvette, and its material is a glass, also no longer is traditional rectangle; But cylindrical tubule, diameter is that 0.4cm highly is 2cm, the purpose of doing like this is to reduce cost; Reduce the use of solvent, and help the raising of detection of organic phosphorus pesticide appearance sensitivity.

Photoelectric cell adopts the sensitive down purple light silion cell of visible light, and is not only highly sensitive, and acceleration detection speed.

Comprise signal amplification circuit (referring to Fig. 5), analog-to-digital conversion circuit (referring to Fig. 6), data computing cicuit three parts composition in the data processing circuit.The effect that realizes respectively is the amplification detection signal, and detection signal is transformed into digital signal, and the digital signal that will be transformed is carried out computing.

Display device is used for the information of display operation process and final result.

Central processing element is to be served as by 51 type single-chip microcomputers, and he will accomplish the data processing work in the mensuration process, again the Control work of each parts in the detector.Through in internal composition carry out the program paragraph of analyzing and processing to detecting data, can be in order to the detection task of the organophosphorus pesticide of accomplishing low concentration.

The project organization reference diagram of worktable is seen Fig. 2 to Fig. 4 in the detection of organic phosphorus pesticide appearance that the utility model provides; The utility model employing light emitting diode is as visible light source 1 and be placed on worktable central authorities; Both sides are provided with the separate detection system of two-way respectively; Visible light source 1 both sides are followed successively by optical filter 2 (1cm*1cm*0.2cm) and cuvette 3, are positioned on the light path of cuvette back photoelectric cell 4 (silicon photocell) is set.

The light that visible light source 1 sends shines on the cuvette 3 through optical filter 2 through light hole 8 (diameter is 0.3cm).

During detection, the solution to be measured that at first will configure joins in the cuvette 3, opening power; Measured pesticide name can be pointed out by system, and selection needs the pesticide name of measurement, and system can select required light source automatically; And open pairing sense channel; Receive signal by sperrschicht cell, and amplify, again signal is delivered to the singlechip chip place by amplifying circuit.Singlechip chip receives signal and compares with the experimental data that single-chip microcomputer inside has configured, calculates the concentration of solution to be measured, and is shown to the user.

Through above design, can make fruits and vegetables detection of organic phosphorus pesticide appearance reach convenient and swift, with low cost, the characteristics that are applicable to any crowd simple to operate.

Claims

1. detection of organic phosphorus pesticide appearance; It is characterized in that this detector comprises visible light source, optical filter, cuvette, photoelectric cell, data processing circuit, display device and central control chip; Described optical filter is arranged between visible light source and the cuvette; Photoelectric cell is positioned on the light path of cuvette back, and photoelectric cell connects data processing circuit and display device successively through circuit, and visible light source, cuvette, photoelectric cell, data processing circuit and display device are connected central control chip respectively.