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Natural matrix standard sample for 13 pesticide residues in tea and preparation thereof

A natural matrix and standard sample technology, applied in the field of analytical chemistry, can solve the problems that cannot accurately reflect the accuracy of the method, cannot truly reproduce the extraction efficiency of drugs, and the detection results are not convincing enough to achieve high application and promotion value , good uniformity and easy storage

Active Publication Date: 2014-05-21
INSPECTION & QUARANTINE TECH CENT OF FUJIAN ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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  • 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 sample for 13 pesticide residues in tea and preparation thereof
  • Natural matrix standard sample for 13 pesticide residues in tea and preparation thereof
  • Natural matrix standard sample for 13 pesticide residues in tea and preparation thereof

Examples

Experimental program
Comparison scheme
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 for 13 pesticide residues in tea and a preparation method thereof. The preparation method comprises the steps of applying trifloxystrobin, cyprosulfamide, pyrimethanil, metalaxyl, bifenthrin, endosulfan, triadimefon, dinikonazol, epoxiconazole, pyridaben, ametryn, napropamide and acetochlor to a tea tree for test or soil in a region for test, and collecting the tea to prepare the natural matrix standard sample. The preparation method of the natural matrix standard sample for the tea is scientific and reasonable, and is strong in maneuverability. The prepared natural matrix standard sample is good in uniformity and stability, easy to store, and convenient to use; a sampling amount is equal to that of an extracting and purifying method and a daily analysis sample, detection data obtained from different time, different environment temperatures and different detection persons are reliable and accurate, thus the preparation method is suitable for being used as a quality control means in detection work, and is relatively high in application and popularization values.

Description

Technical field [0001] The invention belongs to the field of analytical chemistry, and specifically relates to a method for preparing standard samples of natural contamination of 13 pesticide residues in tea. Background technique [0002] Tea is my country's dominant industry, and the problem of pesticide residues in tea has always been a key issue that people are concerned about. In recent years, detection methods for pesticide residues in tea have been continuously developed, playing a key role in ensuring tea safety and promoting tea trade. [0003] In the research on pesticide residue detection technology, accurate residue detection methods are inseparable from the quality control of the detection results. Since quality control by adding blank matrix cannot truly reproduce the extraction efficiency of drugs in the body after natural metabolism, If the accuracy of the method cannot be accurately reflected, the test results obtained will not be convincing enough. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(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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