A method and device for automatic concentration and enrichment of pesticides for microfluidic detection

Abstract

The invention discloses an automatic pesticide concentration and enrichment method and device for microfluidics detection. A sampling chamber and a sample arrangement chamber are connected through a plastic hose, the right side of the sampling chamber is connected with the upper end of a sample filtering chamber through a sample feeding channel, the right side of the sample filtering chamber is connected with a drain outlet, the lower end of the sample filtering chamber is connected with the right side of the sample arrangement chamber through a sample discharging channel, a fourth electromagnetic valve and a photoelectric detection device are arranged on the sample discharge channel; a sample feeding and a sampling motor are arranged outside a shell, an output shaft of the sample feeding motor is coaxially connected with a first ball lead screw which is fixedly connected with the left end of a first compression rod, the right end of the first compression rod extends into the sampling chamber; an output shaft of the sampling motor is coaxially connected with a second ball lead screw which is fixedly connected with the left end of a second compression rod, and the right end of the second compression rod extends into the sample arrangement chamber, so that the sample feeding, concentration and arrangement processes of to-be-concentrated pesticide solution can be automatically realized.

Description

technical field [0001] The invention relates to pesticide detection and microfluidic technology, in particular to a method and a device for enriching and concentrating pesticides with a microfluidic chip. Background technique [0002] Pesticides are an important weapon to quickly, efficiently and economically control crop pests and diseases. However, the problem of excessive pesticide residues in vegetables has always been prominent. One of the important reasons is that when the pesticide residue content in crops is relatively low, the current rapid detection methods for pesticide residues (such as enzyme inhibition method) cannot realize the rapid detection of pesticide residues, so the current standard pesticide residue determination methods need to use expensive large-scale analytical instruments, so that it is impossible to quickly detect cheap vegetables anytime and anywhere. Therefore, when the pesticide residue content in crops is relatively low, it is particularly im...

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Problems solved by technology

[0002] Pesticides are an important weapon to quickly, efficiently and economically control crop pests and diseases. However, the problem of excessive pesticide residues in vegetables has always been prominent. One of the important reasons is that when the pesticide residue content in crops is relatively low, the current rapid detection methods for pesticide residues (such as enzyme inhibition method) can not achieve rapid detection of pesticide residues, so the current standard pesticide residue determination method requires the use of expensive large-scale analytical instruments, so that it is impossible to quickly detect cheap vegetables anytime and anywhere

Although the device has a simple structure, low cost, flexible movement, easy operation, and can significantly improve the efficiency of sample processing, the actual consumption of samples is relatively large when the device is used to detect pesticide residues in crops, and the enrichment process cannot be automated. , which also limits the widespread use of the device

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