With the increasing attention of people to healthy eating, tea is becoming more and more popular as a healthy drink. However, in recent years, the problem of pesticide residues in tea has occurred from time to time, which has seriously affected the quality of tea and the health of consumers. In order to protect the quality of tea and the health of consumers, the tea pesticide residue detector came into being. This article will introduce the method of detecting tea with a tea pesticide residue detector.
1. Sample collection.
Before testing for pesticide residues in tea, samples need to be collected first. The tea samples collected should be representative and reflect the overall picture of the tea batch. The number of tea samples collected should be determined on a case-by-case basis, generally not less than 20 grams. The collected tea samples should be sealed and stored to avoid contamination from the outside world.
2. Instrument preparation.
Before carrying out tea pesticide residue testing, you need to prepare a tea pesticide residue detector. Choose a detector that meets national standards to ensure its accuracy and reliability. At the same time, it is also necessary to prepare the corresponding reagents and consumables, such as extraction agents, purification agents, chromatographic columns, etc.
3. Sample processing.
Before testing for pesticide residues in tea, the collected tea samples need to be treated. First, the tea samples are crushed into powder form and then extracted with an appropriate amount of extracting agent. The extracted solution needs to be purified to remove impurities and interferences. There are many ways to purify, and you can choose the right one according to the specific situation. The effect of decontamination directly affects the accuracy of the test results, so careful operation is required.
Fourth, on-board testing.
After the sample processing is completed, the purified solution is tested on the machine. Inject the purified solution into the tea pesticide residue detector and operate according to the instrument manual. In the process of on-machine detection, it is necessary to pay attention to avoid cross-contamination and human error to ensure the accuracy of the test results.
5. Analysis of results.
After the hands-on assay is completed, the analysis is carried out according to the chromatogram and data displayed by the instrument. The chromatogram is one of the bases for judging whether the pesticide residues in tea exceed the standard, and the data is one of the bases for judging the amount of pesticide residues. According to the relevant national standards, the pesticide residues in tea are judged, and if they exceed the standard, corresponding measures need to be taken to deal with them. At the same time, it is also necessary to conduct statistics and analysis of the test results to understand the overall situation of the batch of tea and provide a scientific basis for producers and managers.
6. Precautions.
When testing for pesticide residues in tea, the following points need to be noted:
1.Operate in strict accordance with the instrument instructions to avoid inaccurate test results due to improper operation;
2.Pay attention to the representativeness of the sample to ensure that the collected sample can reflect the overall situation of the batch of tea;
3.Pay attention to the storage and transportation of samples to avoid external contamination;
4.Pay attention to the environmental and hygienic conditions of the laboratory to ensure the accuracy of the test results;
5.For tea samples that exceed the standard, corresponding measures need to be taken to avoid the impact on the health of consumers.
In short, the tea pesticide residue detector is an important tool to ensure the quality of tea and the health of consumers. Through scientific and accurate detection methods, pesticide residues in tea can be effectively detected, providing a scientific basis for producers and managers. At the same time, it is also necessary to strengthen the management and supervision of tea production, control the use of pesticides from the source, and ensure the quality of tea and the health of consumers.