克服其他测试方法50的分析挑战:分析来自静止源排放的被动化中的挥发性化化合物
M Ariel Geer Wallace1, Stephen R Jackson1, William T Preston2
1U.S. EPA, Center for Environmental Measurement and Modeling, Air Methods and Characterization Division, 109 TW. Alexander Drive, RTP, NC 27711, USA.
Journal of chromatography. A
|August 3, 2025
概括
这项研究优化了一种用于测量来自工业来源的对和多基物质 (PFAS) 排放到空气中的方法. 调整缩器前温度和干净时间提高了准确性,即使是高二氧化碳水平.
科学领域:
- 环境化学环境化学
- 分析化学 分析化学
背景情况:
- 和多基物质 (PFAS) 排放是一个日益严重的环境和健康问题.
- 目前,测量制造和焚烧过程中的PFAS空气排放的方法有限.
- 挥发性化化合物 (VFC) 可能存在于静止源排放中.
研究的目的:
- 开发和优化用于测量空气排放中的VFC,包括PFAS的分析方法.
- 为了应对高湿度和样本中的二氧化碳 (CO2) 水平所带来的挑战.
- 根据美国环境保护局 (EPA) 的标准验证该方法的性能.
主要方法:
- 采用了基于美国环保署的其他测试方法 (OTM) -50的采样容器和热溶解气体染色学/质谱学 (TD-GC/MS).
- 使用原型预缩器进行试验,调整陷温度和干净持续时间.
- 分析了不同二氧化碳度的样本,以评估方法的可靠性.
主要成果:
- 预先缩器陷温度为-30°C被发现是最佳的,避免了过度的二氧化碳捕获.
- 将干净时间增加到9分钟有效地去除了CO2,确保目标化合物回收在标准值的±30%内.
- 最优化的方法在高二氧化碳水平的情况下证明了精度和可靠性.
结论:
- 开发的分析方法有效地在具有挑战性的排放样本中测量VFC,包括PFAS.
- 优化的预度参数允许在高二氧化碳度的情况下进行准确的分析.
- 这种方法提高了监测固定来源的PFAS排放的能力.
关键词:
其他测试方法50 (OTM-50)挥发性化化合物 (VFCs) 是一种挥发性化化合物.抽样采样 抽样采样气体染色学/质谱学 (GC/MS) 是一种通过和多化基物质 (PFAS).热性脱吸 (TD) 是一种更多相关视频
09:04Identifying Per- and Polyfluorinated Chemical Species with a Combined Targeted and Non-Targeted-Screening High-Resolution Mass Spectrometry Workflow
Published on: April 18, 2019
12.6K
07:06Investigating Long-Distance Transport of Perfluoroalkyl Acids in Wheat via a Split-Root Exposure Technique
Published on: September 28, 2022
1.7K
相关概念视频
01:19Gas Chromatography: Types of Detectors-II
501
In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
501
01:10Volatilization
534
Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
534
01:29Atomic Fluorescence Spectroscopy
499
Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
499
01:25Atomic Absorption Spectroscopy: Atomization Methods
666
Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
666
01:30Atomic Emission Spectroscopy: Interference
274
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
274