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Method for quantitatively analyzing fluorobenzene series and cyclohexane liquid crystal monomers based on GC-MS/MS technology

A quantitative analysis and liquid crystal monomer technology, applied in the field of chemical detection, can solve problems such as environmental hazards, complex liquid crystal components, systematic qualitative and quantitative detection of fluorobenzene series and cyclohexane liquid crystal monomers, etc., and achieve high precision And stable, with many types of detection and high precision

Active Publication Date: 2021-06-15
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, while it brings us a high quality of life, it also brings us new environmental hazards—the liquid crystal monomers (LCMs), which are the core components of LCDs, and their environmental exposure levels and ecological toxicity are still unclear
The liquid crystal composition is complex, most of which contain fluorine, cyano, bromine, chlorine and other atoms or groups that may be harmful to the environment. The liquid crystal monomer will not bond with any substrate of the liquid crystal display, but only added to the product, so During the production, transportation, use and disposal of liquid crystal displays, liquid crystal monomers may be released into the environment, which may cause serious environmental and ecological problems
At present, there are relatively few studies on LCMs, and there is no systematic qualitative and quantitative detection method for fluorobenzene-based and cyclohexane-based liquid crystal monomers.

Method used

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  • Method for quantitatively analyzing fluorobenzene series and cyclohexane liquid crystal monomers based on GC-MS/MS technology
  • Method for quantitatively analyzing fluorobenzene series and cyclohexane liquid crystal monomers based on GC-MS/MS technology
  • Method for quantitatively analyzing fluorobenzene series and cyclohexane liquid crystal monomers based on GC-MS/MS technology

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Embodiment 1

[0026] A method for quantitatively analyzing fluorobenzene series substances and cyclohexane substances (liquid crystal monomers) based on GC-MS / MS technology, comprising the steps of:

[0027] S1. Pretreatment of fish liver samples: store the collected liver samples in a liquid nitrogen tank at -190±10°C for 30 minutes to quench the metabolic reaction, and then transfer them to a refrigerator at -80±5°C for storage. The liver sample taken out of the test tube was placed in a mortar, added liquid nitrogen to freeze and ground into powder, passed through a 100-mesh sieve, put into a 15mL centrifuge tube, and stored in a -80°C refrigerator for analysis; weighed about 20 mg of the processed sample , add 3.5mL of dichloromethane, shake for 15min, ultrasonically extract for 20min, then centrifuge at 4500r / min for 8min, transfer the supernatant to a clean glass tube, and repeat the extraction process 3 times. The combined supernatants were concentrated and replaced with n-hexane to ...

Embodiment 2

[0031] A method for quantitatively analyzing fluorobenzene series substances and cyclohexane substances (liquid crystal monomers) based on GC-MS / MS technology, comprising the steps of:

[0032] S1. Pretreatment of dust samples: Weigh about 20 mg of dust samples through a 100-mesh sieve, add 3.5 (± 0.5) mL of dichloromethane, shake for 15 (± 2) min, ultrasonically extract for 20 (± 2) min, and then use 4500r / min (±500) for 8 (±2) min, transfer the supernatant to a clean glass tube, and repeat the extraction process 3 (±1) times. The combined supernatants were concentrated and replaced with n-hexane to 0.5 mL under a gentle flow of nitrogen. The concentrated supernatant was purified with columns of 3.0 g florisil (5% water deactivated) and 1 g anhydrous sodium sulfate from bottom to top. The column was activated with 25mL of dichloromethane and 25mL of n-hexane, then the concentrated supernatant was added, rinsed with 20mL of dichloromethane, the eluate was collected, concentr...

Embodiment 3

[0036] A method for quantitatively analyzing fluorobenzene series substances and cyclohexane substances (liquid crystal monomers) based on GC-MS / MS technology, comprising the steps of:

[0037] S1. Pretreatment of samples in fish liver: store the collected liver samples in a liquid nitrogen tank at -190 ± 10°C for 30 minutes to quench the metabolic reaction, and then transfer them to a refrigerator at -80 ± 5°C for storage. The liver sample taken out of the refrigerator was placed in a mortar, added liquid nitrogen to freeze and ground into powder, passed through a 100-mesh sieve, put into a 15mL centrifuge tube, and stored in a -80°C refrigerator for analysis; weighed about 20 mg of the treated liver Add 4.0 mL of dichloromethane to the sample, shake for 15 min, ultrasonically extract for 20 min, then centrifuge at 4800 r / min for 8 min, transfer the supernatant to a clean glass tube, and repeat the extraction process 3 times. The combined supernatants were concentrated and re...

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Abstract

The invention belongs to the technical field of chemical detection, and particularly discloses a method for quantitatively analyzing fluorobenzene substances and cyclohexane substances based on a GC-MS / MS technology. The method can be used for qualitatively and quantitatively analyzing fluorobenzene substances and cyclohexane substances in a to-be-detected sample, and has multiple detection types. The method provided by the invention is high and stable in precision, and has important significance on subsequent research of liquid crystal monomer substances.

Description

technical field [0001] The invention belongs to the technical field of chemical detection, in particular to a method for quantitatively analyzing fluorinated benzene series substances and cyclohexane liquid crystal monomers based on GC-MS / MS technology. Background technique [0002] The rapid development of liquid crystal display (LCD) has replaced the traditional cathode ray tube display and has become the mainstream product in the field of information display today, which makes liquid crystal monomers develop rapidly. The liquid crystal industry started in the 1970s. In the process of development and growth in the past ten years, my country has become an indispensable part of the international liquid crystal market. However, while it brings us a high-quality life, it also brings us new environmental hazards—the liquid crystal monomers (LCMs), which are the core components of LCDs, and their environmental exposure levels and ecotoxicity are still unclear. The liquid crysta...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06
CPCG01N30/02G01N30/06
Inventor 曾力希李全沈明杰梁欣欣陆钢江金阳郭青苏张雪俐
Owner JINAN UNIVERSITY