Pesticide residue detection is the scientific test of pesticide residue content by pesticide residue detector to obtain data and analyze it. Finally, it is known whether the pesticide residue content of vegetables exceeds the standard.
The accurate and rapid detection and analysis of food contaminants is an important technical support for the implementation of food safety plans, and has important social significance for the protection of people's health. The Ministry of Science and Technology "Tenth Five-Year" scientific and technological research on food safety major projects, the establishment of eight food safety demonstration zones in the country, for pesticide residues in fruit and vegetable tea, nitrite in salted products, formaldehyde in foam products, etc. There is a great demand for on-site rapid detection technology and instruments. As an important part of public safety, food safety has been included in the national medium and long-term science and technology development plan, so food safety rapid measurement technology and instruments will also be promoted nationwide.
The instrument adopts internationally advanced high-integration optoelectronic components and computer technology, uses SoC (System-on-a-Chip) technology, and adopts software and hardware design of real-time multi-tasking microcomputer system, and battery or utility power supply. Touch screen operation, with the corresponding rapid pretreatment technology and kit, can choose and simultaneously measure pesticide residues such as pesticide residues, nitrite, formaldehyde, hexavalent chromium, etc. according to needs, with simple structure, small size and convenient use. The functions of displaying, storing, transmitting or printing the measurement results are applicable to various food wholesale markets, bazaars, supermarkets, hotels, canteens, etc. where the food needs to be quickly tested, and the test results meet the requirements of the national recommended standard method. In addition, the project used subcritical water extraction technology as a pretreatment method for rapid analysis of pesticide residues for the first time, and developed a corresponding portable rapid pretreatment device.
The research established the subcritical water extraction technology of pesticide residues in fruits and vegetables. Compared with the original manual oscillation method, it has the advantages of high extraction efficiency, short time and easy operation. There are no such commercial instruments in literature search at home and abroad. The main technical indicators of the instrument are: accuracy (relative error): ±10% precision (relative standard deviation): 5% instrument stability (very poor absorbance per hour): 0.005 reading display: 128 × 64 LCD screen, Chinese menu operation mode: touch screen power supply: lithium battery / external power supply Instrument size: about 20 × 12 × 5 cm Instrument weight: about 500 grams (without battery) Operating temperature: 5-40 ° C Use humidity: <90% (50 ° C Time).
Portable Pesticide Residue Tester/Pesticide Residue Scope: It can be widely used in agriculture, environmental protection, quality inspection and other departments and hotels, restaurants, canteens, farmers markets, supermarkets and other units to detect pesticide residues in fruits and vegetables, and can be used to establish centers. A pesticide residue monitoring system was established at the pesticide monitoring station and the pesticide monitoring substation. Working principle: The use of organophosphorus and carbamate pesticides can inhibit the activity of acetylcholinesterase. Under certain conditions, the inhibition rate depends on the type and content of pesticides. By measuring the magnitude of the inhibition rate, it is judged whether the pesticide residues in vegetables, fruits and fruits exceed the standard.
Sprinkler irrigation and micro-irrigation automatic control equipment With the development of economy, water resources, energy shortage and labor cost increase, more and more water-saving irrigation systems will adopt automatic control. This article focuses on the advantages and classification of automated irrigation.
The advantages are as follows:
(1) It is possible to truly control the amount of irrigation, irrigation time and irrigation cycle in a timely and appropriate manner, thereby increasing crop yield and significantly improving water utilization.
(2) Saving labor and operating expenses.
(3) The work plan can be arranged conveniently and flexibly, and the management personnel do not have to go to the field at night or other inconvenient time.
(4) Since it can increase the effective working time every day, the initial capital investment in pipelines, pumping stations, etc. can be reduced accordingly.
classification:
First, fully automated irrigation system
The fully automated irrigation system does not require direct human involvement. The pre-programmed control procedures and certain parameters that reflect the water requirements of the crop can automatically open and close the pump for a long time and automatically irrigate in a certain order. The role of the person is simply to adjust the control program and overhaul the control equipment. In this system, in addition to emitters (heads, drip heads, etc.), pipes, fittings, pumps, and motors, it also includes central controllers, automatic valves, sensors (soil moisture sensors, temperature sensors, pressure sensors, water level sensors, and rain sensors). Etc.) and wires.
Second, semi-automatic irrigation system
In the semi-automated irrigation system, no sensors are installed in the field. The irrigation time, irrigation volume and irrigation period are controlled according to pre-programmed procedures, rather than feedback based on crop and soil moisture and meteorological conditions. The degree of automation of such systems is very different. For example, some pump stations implement automatic control, and some pump stations use manual control. Some central controllers are only one timer with simple programming function, and some systems have no central control. The controller, but only some of the sequential switching valves or volume valves are installed on each branch pipe.
Automated irrigation is the trend of the times. In the future water-saving irrigation projects, more and more automated irrigation systems will be applied.
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