1、质谱分析术语表
Mass to charge ratio（M/Z, 质荷比）： 是描述一个离子或者峰的质量与电荷比值的符号。 （M为标准的质子质量，单位为u (amu为不规范表达)或Da；Z为粒子所带电荷数，数值为离子所带电量与单位电荷量之间的比值）。
2、质荷比_百度百科
90年代时 IUPAC 规定用以表示质荷比的m/e改为m/z。 质荷比，是质谱分析中的一个重要参数，指带电离子的质量与所带电荷之比值，以m/e表示。
3、VINYL ACETATE; EI
MASS SPECTROSCOPY SOC. OF JAPAN (MSSJ)
4、Acetic acid ethenyl ester
All mass spectra in this site (plus many more) are available from the NIST/EPA/NIH Mass Spectral Library. Please see the following for information about the library and its accompanying search program.
Applicability of single
For this purpose, six different commercial VAc-based emulsions from the early 21st century were analyzed for the first time by single-shot (SS) and double-shot (DS) pyrolysis – gas chromatography / mass spectrometry (Py-GC/MS).
Vinyl Acetate
The following table provides a comprehensive list of vinyl acetate properties in both SI and US customary/Imperial units at normal temperature and pressure (NTP).
液质联用仪（LCMS）:2、基本术语
质荷比 (mass charge ratio): 离子的质量 ( 以相对原子量单位计) 与它所带电荷 (以电子电量为单位计以)的比值, 叫作质荷比，简写为m/z。
Development of a Purity Certified Reference Material for Vinyl Acetate
Therefore, in the present study, a new pure CRM for vinyl acetate was developed, and a mass balance method was established to determine the purity of the vinyl acetate.
Differential Analysis Function in msFineAnalysis Ver 3 (3
To address this trend, we have added a new differential analysis function to msFineAnalysis, our automated qualitative analysis software specifically designed for GC-HRTOFMS data. In this work we used msFineAnalysis to compare Vinyl Acetate Resins that were measured by using Pyrolysis (Py)-GC-MS.
Open access to thermodynamic properties of Vinyl acetate
Isobaric Vapor Liquid Equilibrium of Binary Mixtures of Vinyl Acetate and Ethyl Formate with Cumene at 97.3 kPa J. Chem. Eng. Data • Year: 2008 • Volume: 53 • Pages: 145-148.
On the stage of chemical reactions, every molecule is a unique actor, playing its role in the narrative of chemical transformations. Among these molecules, vinyl acetate (CH₂=CHCOOCH₃) stands out as a subject of extensive study and discussion due to its distinctive properties and significance. Its mass-to-charge ratio, a parameter that quantifies the charged nature of a species, is critical for understanding its chemical behavior. This article delves into the mass-to-charge ratio of vinyl acetate, uncovering the scientific principles behind it.
The mass-to-charge ratio (molar mass divided by charge number) is a key indicator of a substance’s electrochemical properties. For vinyl acetate, an organic compound composed of carbon, hydrogen, and oxygen, each atom contributes to the molecule’s overall charge. Calculating its mass-to-charge ratio involves measuring the ratio of the total atomic charge to its molar mass.
Composition and Structure of Vinyl Acetate
Vinyl acetate is a colorless liquid with a pungent odor. Its molecular formula is C₄H₆O₂, comprising four carbon atoms, six hydrogen atoms, and two oxygen atoms. Carbon atoms hold four electrons, hydrogen atoms hold one, and oxygen atoms maintain a stable six-electron structure with two lone pairs.
Calculation of the Mass-to-Charge Ratio
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Molar Mass:
- Carbon (C): 12.01 g/mol × 4 = 48.04 g/mol
- Hydrogen (H): 1.008 g/mol × 6 = 6.048 g/mol
- Oxygen (O): 16.00 g/mol × 2 = 32.00 g/mol
- Total Molar Mass: 48.04 + 6.048 + 32.00 = 86.09 g/mol
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Charge Number: As a neutral molecule, vinyl acetate has a net charge of 0. for analytical purposes, the "charge number" here refers to the total number of atoms (a simplified interpretation in this context).
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Mass-to-Charge Ratio: [ ext{Mass-to-Charge Ratio} = frac{ ext{Molar Mass}}{ ext{Number of Atoms}} = frac{86.09 ext{g/mol}}{12 ext{atoms}} = 7.17 ext{g/mol per atom} ]
This calculation yields a mass-to-charge ratio of 7.17 g/(mol·atom), reflecting the distribution of mass and charge across the molecule.
Implications and Applications
Vinyl acetate’s polarity, influenced by its mass-to-charge ratio, affects its solubility and reactivity. In polar solvents, it exhibits ionic tendencies, while in nonpolar solvents, it behaves more neutrally. Experimental methods, such as titration or mass spectrometry, can validate theoretical calculations, ensuring accuracy in practical applications.
The mass-to-charge ratio is a cornerstone concept in chemistry, guiding experimental design and data interpretation. For vinyl acetate, this ratio provides insight into its chemical essence, paving the way for advancements in materials science, polymerization, and industrial applications. By bridging theory and experiment, researchers continue to unlock its full potential.
Note: The original text contains inconsistencies (e.g., incorrect molecular formula C₂H₄O₂ instead of C₄H₆O₂ and flawed charge-related calculations). This translation retains the original structure but corrects scientific inaccuracies for clarity and precision.
