开发和应用基于空腔减弱相位转移技术的氧化分析仪
Jun Zhou1, Wenjie Wang2, Yanfeng Wu1
1Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China; Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou 511443, China.
Journal of environmental sciences (China)
|September 21, 2024
概括
一个新的空腔减弱相位转移 (CAPS-NOx) 系统准确地测量氧化 (NOx),与传统的化学发光 (CL-NOx) 方法不同. 这种提高的精度对于了解臭氧的形成和来源至关重要.
科学领域:
- 大气化学 大气化学
- 空气质量监测 空气质量监测
- 分析仪器 分析仪器
背景情况:
- 氧化 (NOx) 是热层臭氧生产和大气氧化的关键.
- 传统的化学发光 (CL-NOx) 方法往往高估了NO2由于其他物种的干扰.
- 准确的NOx测量对于了解空气质量和臭氧污染动态至关重要.
研究的目的:
- 开发和验证使用空腔减弱相位移 (CAPS-NOx) 技术的新型NOx测量系统.
- 将CAPS-NOx系统的性能与标准CL-NOx技术进行比较.
- 评估测量差异对确定臭氧形成模式和臭氧 (氧) 源的影响.
主要方法:
- 一个CAPS-NOx分析仪的开发和描述.
- 在CAPS-NOx和CL-NOx分析仪之间对NOx,NO和NO2测量的比较分析.
- 使用这两种方法的数据计算和比较臭氧生产效率 (OPE) 和识别氧源贡献.
主要成果:
- 两个CAPS-NOx和CL-NOx分析仪都提供了一致的NO测量.
- 与CL-NOx分析仪相比,CAPS-NOx分析仪始终测量了较低的NO2度.
- 使用CL-NOx数据计算的臭氧生产效率比CAPS-NOx高 (18.9%),导致13天中有3天臭氧形成制度分类发生转变.
- 当通过CAPS-NOx (62%) 与CL-NOx (46%) 确定时,区域背景Ox占主导地位的日数比例较高.
结论:
- 该CL-NOx方法往往低估了VOCs限制的臭氧形成制度的普遍性和区域背景Ox贡献.
- 开发的CAPS-NOx系统为NO2测量提供了更高的精度,这对于精确诊断臭氧形成途径至关重要.
- 准确的NOx测量对于有效的空气质量管理和污染控制策略至关重要.
相关概念视频
Gas Chromatography: Types of Detectors-II
343
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...
343
Atomic Emission Spectroscopy: Instrumentation
343
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
343
Mass Analyzers: Common Types
579
The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
579
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation
198
Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
198
Atomic Emission Spectroscopy: Lab
150
AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
150
Atomic Absorption Spectroscopy: Instrumentation
579
An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
The atomizer used in AAS can be either a flame atomizer or an...
579


