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Qualitative analytical method of substance

A qualitative analysis and material technology, applied in the field of qualitative analysis, can solve problems such as the inability to detect organic compounds, and achieve a wide range of applications

Inactive Publication Date: 2014-09-03
宜特科技(昆山)电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The detection limit of the existing physical verification methods is about 1% to 0.5%. If the sample concentration is too low, the detection will be no signal; in addition, the existing physical verification methods can only be used for qualitative analysis of metal elements, and for Organic compounds cannot be detected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 (sample is metal sample)

[0027] The qualitative analysis method of this embodiment to unknown substance, comprises the following steps:

[0028] a. For the first qualitative analysis, the substance to be tested is sampled, and the sample is distilled to volume with solvent toluene. The volume temperature is 120°C, the ratio of sample to solvent is 1g:70ml, and the Soxhlet extraction method is used for extraction. The extraction method can also be selected. Ultrasonic extraction, 2 hours after the extraction, the extract was concentrated by blowing nitrogen under reduced pressure and concentrated, and the concentrated liquid was qualitatively analyzed by gas chromatography-mass spectrometry;

[0029] b. For the second qualitative analysis, the substance to be tested is sampled, and the sample is dissolved in a mixed acid to prepare a mixed solution using a microwave digestion method. Carry out qualitative analysis, mixed acid is nitric acid: hydrochloric ...

Embodiment 2

[0032] Embodiment 2 (sample is metal sample)

[0033] The difference between this example and Example 1 is that in step a, the solvent is n-hexane, the constant volume temperature is 80°C, the ratio of sample to toluene is 2g:60ml, and the extract is concentrated after 3 hours of extraction.

Embodiment 3

[0034] Embodiment 3 (sample is metal sample)

[0035] The difference between this example and Example 1 is that in step a, the solvent is acetone, the constant volume temperature is 50°C, the ratio of sample to toluene is 1g:60ml, and the extract is concentrated after 1 hour of extraction.

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Abstract

The invention discloses a qualitative analytical method of a substance. The method comprises the following steps: a, sampling a substance to be detected, quantifying the sample by using a solvent, wherein the quantifying temperature is 50-120 DEG C, and the ratio of the sample to the solvent is (1g-2g):(60ml-80ml), extracting, further concentrating an extract after 1-4 hours, performing qualitative analysis on a concentrated liquid by using a gaschromatographic mass spectrometry; b, sampling the substance to be detected, dissolving the sample into mixed acid to prepare a mixed solution, wherein the ratio of the sample to the mixed acid is (1g:2g):(3ml-5ml), performing qualitative analysis on the mixed solution by using an inductive coupling plasma emission spectrometer, wherein the volume ratio of nitric acid to muriatic acid and hydrofluoric acid in the mixed acid is (1-3):(1-3):(0-0.5); and c, sampling the substance to be detected, performing qualitative analysis on the sample by using a Fourier transformation infrared spectrum analyzer, and comparing a peak value in a spectrum with that of a databank. By adopting the method, the component of an unknown substance can be precisely and qualitatively analyzed.

Description

technical field [0001] The invention relates to a qualitative analysis method, in particular to a qualitative analysis method for analyzing specific components of substances. Background technique [0002] In laboratory experiments or actual production, substances that are non-target products are often generated during the manufacturing process. The specific components of these substances cannot be judged based on chemical reactions, resulting in the non-target products produced by the reaction being treated as production waste, resulting in Some important substances are wasted, resulting in a waste of resources. [0003] The existing component analysis of the above-mentioned unknowns is mainly based on physical verification. For example, the main equipment used is EDS (Energy Dispersive X-Ray Spectroscopy) energy spectrometer and X-ray (X-ray) detector. The detection limit of the existing physical verification methods is about 1% to 0.5%. If the sample concentration is too ...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N21/73G01N21/35
Inventor 郑远泰陈庆宏陈小虎
Owner 宜特科技(昆山)电子有限公司
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