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Natural matrix standard samples of 13 kinds of pesticide residues in tea and their preparation

A natural matrix, standard sample technology, applied in the field of analytical chemistry, it can solve the problems such as the inability to truly reproduce the drug extraction efficiency, the inability to accurately reflect the accuracy of the method, and the unconvincing test results, and to achieve high application and promotion value. , Good uniformity, easy to save effect

Active Publication Date: 2016-02-24
INSPECTION & QUARANTINE TECH CENT OF FUJIAN ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the research of pesticide residue detection technology, accurate residue detection methods are inseparable from the quality control of the test results. Since the quality control by adding blank matrix cannot truly reproduce the extraction efficiency of drugs in vivo after natural metabolism, The accuracy of the method cannot be accurately reflected, and the test results obtained are not convincing enough

Method used

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  • Natural matrix standard samples of 13 kinds of pesticide residues in tea and their preparation
  • Natural matrix standard samples of 13 kinds of pesticide residues in tea and their preparation
  • Natural matrix standard samples of 13 kinds of pesticide residues in tea and their preparation

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Selection of test compounds

[0023] When looking for a compound that can be used as a characteristic quantity of a matrix reference material, the main factors to consider include:

[0024] (1) Stability: A considerable part of pesticides are easy to decompose under natural conditions, difficult to accurately assign and store, and are not suitable as matrix standard substance characteristic quantities;

[0025] (2) Representativeness: Pesticides include insecticides, herbicides, fungicides, and acaricides according to their functions, and they belong to organic nitrogen, organic halogens, organic phosphorus, and pyrethroids. Varieties of pesticides with different functions. Additionally, the polarity of the compound is also a consideration.

[0026] (3) Practicability: focus on the pesticides that are commonly used in the tea growing process and are often required to be tested in the tea trade, and have been registered in my country, and commercial pesticide compounds...

Embodiment 2

[0034] 1) There are 2.2 mu of tea trees in total: 0.2 mu is a blank test area, 15 meters away from the test area, and 2 mu is a test area, which is equally divided into 10 areas. The test tea trees are not fertilized within 25 days before the test. administer medicine;

[0035] 2) Apply pesticides to the tea trees in the test area. The pesticide application method is: mix 30g of trifloxystrobin, 60g of 50wt% boscalid, and 120ml of 40wt% pyrimethanil, spray on the tea trees in the test area, and then take 35wt % metalaxyl 80g, bifenthrin 80ml, 35wt% endosulfan 80g mixed, sprayed on the tea tree in the test area, then 25wt% triadimefon 40g, 5wt% diniconazole 80ml, epoxiconazole 60ml mixed, Spray in the soil of the test area, then take 15g of pyridaben and spray it in the soil of the test area, and finally mix 260g of ametryn, 200g of napropamide, and 200g of acetochlor, and spray it in the soil of the test area ; After spraying, the pesticides are naturally metabolized in tea l...

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Abstract

The invention discloses a natural matrix standard sample containing 13 pesticide residues in tea and a preparation method thereof. Trifloxystrobin, boscalid, pyrimethanil, metalaxyl, bifenthrin, endosulfan, triadimefon, diniconazole, epoxiconazole, pyridaben, ametryn, napropamide, Acetochlor was sprayed on the tea trees or the soil of the test area, and the tea leaves were collected to make natural matrix standard samples. The tea natural matrix standard sample preparation method is scientific and reasonable, and has strong operability. The prepared sample has good uniformity, good stability, easy storage, and convenient use; the sampling volume, extraction, and purification methods are the same as those for daily analysis samples. The detection data obtained by different ambient temperatures and different detection personnel are reliable and accurate, suitable for use as a quality control method in detection work, and have high application and promotion value.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, and in particular relates to a preparation method of 13 kinds of pesticide residue natural pollution standard samples in tea. Background technique [0002] Tea is an advantageous industry in our country, and the problem of pesticide residues in tea has always been a key issue that people care about. In recent years, detection methods for pesticide residues in tea have been continuously developed, which has played a key role in ensuring tea safety and promoting tea trade. [0003] In the research of pesticide residue detection technology, accurate residue detection methods are inseparable from the quality control of the test results. Since the quality control by adding blank matrix cannot truly reproduce the extraction efficiency of drugs in vivo after natural metabolism, If the accuracy of the method cannot be accurately reflected, the detection results obtained are not convincing enough. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28
Inventor 杨方
Owner INSPECTION & QUARANTINE TECH CENT OF FUJIAN ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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