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Solvents01:12

Solvents

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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
A...
67.1K
Vapor Pressure Lowering03:28

Vapor Pressure Lowering

27.8K
The equilibrium vapor pressure of a liquid is the pressure exerted by its gaseous phase when vaporization and condensation are occurring at equal rates:
 
Dissolving a nonvolatile substance in volatile liquid results in a lowering of the liquid’s vapor pressure. This phenomenon can be explained by considering the effect of added solute molecules on the liquid's vaporization and condensation processes. To vaporize, solvent molecules must be present at the surface of the solution....
27.8K
Bioremediation00:46

Bioremediation

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Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
20.0K
Ideal Solutions02:24

Ideal Solutions

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According to Raoult’s law, the partial vapor pressure of a solvent in a solution is equal or identical to the vapor pressure of the pure solvent multiplied by its mole fraction in the solution. However, Raoult's Law is only valid for ideal solutions. For a solution to be ideal, the solvent-solute interaction must be just as strong as a solvent-solvent or solute-solute interaction. This suggests that both the solute and the solvent would use the same amount of energy to escape to the...
20.0K
Titration in Nonaqueous Solvents01:16

Titration in Nonaqueous Solvents

954
Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
954
Supercritical Fluid Chromatography01:18

Supercritical Fluid Chromatography

366
Supercritical fluid chromatography (SFC) provides a beneficial substitute for gas chromatography (GC) and liquid chromatography (LC) for certain samples because it merges the top attributes of both techniques. SFC allows the separation and analysis of compounds that GC or LC does not easily manage. These compounds are traditionally nonvolatile or thermally unstable, making GC unsuitable and lacking functional groups required for HPLC analysis.
SFC utilizes a supercritical fluid mobile phase,...
366

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相关实验视频

Updated: Sep 9, 2025

Analyzing the Photo-oxidation of 2-propanol at Indoor Air Level Concentrations Using Field Asymmetric Ion Mobility Spectrometry
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溶剂的技术进步导致VOC排放和工业溶剂使用来源的负面影响显著减少

Zhihao Zhang1, Miaofei Wang2, Di Wang2

  • 1College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.

Environmental pollution (Barking, Essex : 1987)
|August 30, 2025
PubMed
概括
此摘要是机器生成的。

由于配方的进步,工业溶剂的使用显著减少了挥发性有机化合物 (VOC) 的排放,尤其是基于溶剂的油漆. 加强通风进一步降低了VOC水平,改善了环境和健康安全.

关键词:
驱动因素风险评估使用溶剂基于溶剂的涂料 (SBP)挥发性有机化合物 (VOC)水性涂料 (水性涂料)

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相关实验视频

Last Updated: Sep 9, 2025

Analyzing the Photo-oxidation of 2-propanol at Indoor Air Level Concentrations Using Field Asymmetric Ion Mobility Spectrometry
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科学领域:

  • 环境化学
  • 工业卫生
  • 污染控制

背景情况:

  • 工业溶剂使用是挥发性有机化合物 (VOC) 排放的主要来源,对环境和健康造成危害.
  • 了解从特定工业来源减少VOC的驱动因素对于有效的污染控制策略至关重要.

研究的目的:

  • 在工业环境中研究基于溶剂和基于水的油漆的VOC排放情况.
  • 确定影响VOC排放和相关环境/健康风险的关键因素.
  • 评估增强通风对VOC减少的影响.

主要方法:

  • 进行实地实验以测量VOC度 (逃离和呼吸区).
  • 分析了基于溶剂和基于水的涂料的VOC排放情况.
  • 对排放的VOC物种进行了反应性分析.
  • 评估了增强通风 (高风速) 的影响.

主要成果:

  • 与之前的研究相比,基于溶剂的涂料显示出极大的VOC降低 (99.0-99.8%),与配方的进步有关.
  • 水性涂料的VOC含量始终很低,但减少的程度很小.
  • 在强风条件下,强化通风使溶剂性油漆的VOC度降低了57.9%.
  • 在以溶剂为基础的油漆中观察到高反应性VOC物种的显著减少.

结论:

  • 溶剂配方的进步大大减少了工业溶剂使用的VOC排放量.
  • 控制反应性和有毒的VOC物种对于减轻工业溶剂使用的风险至关重要.
  • 透气策略可以进一步提高VOC的减少,特别是在基于溶剂的应用中.