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Method for detecting and analyzing chlorothalonil residues in water environments

An analytical method and chlorothalonil technology, applied in the field of detection, can solve problems such as inability to accurately analyze the content level of chlorothalonil, and achieve the effects of improving sensitivity, simple operation, and reducing mass spectrometry conditions.

Inactive Publication Date: 2019-05-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is a qualitative and semi-quantitative analysis, and cannot accurately analyze the specific content level of chlorothalonil

Method used

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  • Method for detecting and analyzing chlorothalonil residues in water environments
  • Method for detecting and analyzing chlorothalonil residues in water environments
  • Method for detecting and analyzing chlorothalonil residues in water environments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] (1) Water sample pretreatment

[0063] ①Take 100mL water sample, filter it through a 0.45μm filter membrane, put it in a 250mL separatory funnel, then add 10g sodium chloride, after it dissolves, add 10mL n-hexane, shake vigorously on a shaking table for 10min, and let it stand for 30min to separate layers Finally, transfer the extract to a 50mL plastic centrifuge tube, repeat the extraction once, and combine the extracts to obtain Extract 1;

[0064] ② Weigh 10g of anhydrous sodium sulfate and place it in a funnel with filter paper, rinse it with n-hexane, discard the eluent, then pass the extract obtained in step (1) ① through the funnel, and wash it with the extractant 2 times to obtain the washing solution, pass the above-mentioned extract one and the washing solution through the funnel through the drying column to obtain the extract two, and place them in a chicken heart bottle;

[0065] ③Rotary evaporate the extract solution 2 to 2-3mL, then wash the heart bottle...

Embodiment 2

[0078] Compared with Example 1, the only difference is that the extraction solvent n-hexane is replaced by methanol, and other conditions and operations are the same as in Example 1.

[0079] In this example, the detection limit is 0.012 μg / L.

Embodiment 3

[0081] Compared with Example 1, the only difference is that the extraction solvent n-hexane is replaced by a 1:1 mixed solvent of methanol and n-hexane, and other conditions and operations are the same as in Example 1.

[0082] In this example, the detection limit is 0.012 μg / L.

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Abstract

The invention discloses a method for detecting and analyzing chlorothalonil residues in water environments, and belongs to the technical field of detection. The method includes the following steps: 1)performing water sample pretreatment; and 2) performing detection on chlorothalonil in a water sample. Optimization can be performed on sample pretreatment, chromatographic conditions and a detectionmethod based on the chlorothalonil extraction in the water sample, so that the method is high in processing efficiency, fast in detection and high in sensitivity, and the chlorothalonil in water environments can be accurately quantified, and therefore, reliable analysis means can be provided for comprehensive census of the content level and distribution characteristics of the chlorothalonil in the water environments.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a detection and analysis method for chlorothalonil residues in a water environment. Background technique [0002] The chemical name of chlorothalonil (chlorothalonil) is tetrachloroisophthalonitrile, which is a non-systemic, broad-spectrum, high-efficiency protective fungicide, which can prevent and control fungal diseases of various crops. Its bactericidal mechanism is to interact with the glyceraldehyde phosphate dehydrogenase in the fungal cells, combine with the cysteine-containing protein in the dehydrogenase body, inactivate the dehydrogenase, destroy the metabolism of the fungal cells, and lead to the death of the fungus . [0003] Chlorothalonil has been used in world agricultural production for more than 50 years since its production. Due to extensive and long-term use, chlorothalonil residues have been detected in crops and natural ecological environments, which pose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06
Inventor 李海普刘博宇姚晶晶林惠菊杨兆光李跃
Owner CENT SOUTH UNIV
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