Full-automatic pesticide residue detector

Abstract

The invention provides a full-automatic pesticide residue detecting method. An automatic mechanical arm is matched with an automatic sample feeder so as to realize that an enzyme solution, a color-developing agent and a substrate reagent are added according to the setting of a program; a controller and a control software module are used for controlling and detecting a mechanical arm assembly, an automatic sample feeder assembly, a rotary type colorimetric disk assembly and a photoelectric measurement module; the mechanical arm assembly comprises the mechanical arm which rotates around a horizontal arc-shaped rotating shaft and vertically moves up and down; a sample feeding needle of the automatic sample feeder assembly is arranged at the end part of the mechanical arm; the automatic sample feeder adds a reagent frame or different reagents on a reagent disc into a colorimetric cup located in the rotary type colorimetric disk assembly through the sample feeding needle; the automatic sample feeder assembly comprises a pipeline and a metering pump sample feeder controlled by a stepping motor; the sample feeder is connected with the sample feeding needle on the mechanical arm through the pipeline; a reagent of the reagent frame is quantitatively absorbed into the colorimetric cup through the movement of the mechanical arm; and the colorimetric cup is internally provided with a sample to be detected in advance and the photoelectric measurement module is used for detecting.

Description

technical field [0001] The invention relates to a method and an instrument for detecting pesticide residues. Background technique [0002] Existing pesticide residue detectors include instruments that utilize colorimetric methods for detection. For example, it is most commonly used to detect organophosphorus and carbamate pesticides in vegetables and fruits. However, the quality and food inspection departments test a large amount of samples and require mechanized and automated pesticide residue detectors. Existing products cannot It is suitable for occasions where the quantity of samples tested by quality and food inspection departments is large and the detection requirements are precise. [0003] The automatic line is equipped with a multi-station mechanical arm to move the product, but it has not been applied to the pesticide residue detector. [0004] At present, the existing pesticide residue detector mainly uses LED light source to irradiate the reaction solution, and...

AI Technical Summary

Problems solved by technology

In the experimental process, there are inevitably sampling errors and timing errors, and the operation is cumbersome.

[0005] Existing instrument detection: Enzyme solution, chromogenic reagent and substrate all need to be manually added to the cuvette in proportion, which is low in efficiency and large in error

It is necessary to add different amounts of various reagents at different time periods according to the requirements of the reagent instructions. In order to avoid cross-contamination, the sampler needs to be replaced. During the experiment, timing errors are inevitable and the operation is cumbersome.

Since the existing multi-channel detectors do not use the same channel for measurement, there are individual differences in the entire optical detection system, and measurement errors between channels cannot be avoided

In addition, reagent blank comparison and sample detection are carried out at different times, and the interval is long, and environmental variables such as power supply and temperature will affect the detection results; there is no or no function of detecting the air blank (or distilled water) blank of the cuvette