流通式空气采样器的采样效率:采样率的影响。

IF 3.8 2区 化学 Q1 BIOCHEMICAL RESEARCH METHODS Journal of Chromatography A Pub Date : 2024-10-28 DOI:10.1016/j.chroma.2024.465474
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引用次数: 0

摘要

流动采样器(FTS)是一种高效的风力主动采样装置,可在短时间内采集大量空气。在实际采样过程中,FTS 的采样率会出现持续波动,因此需要深入研究其对突破的影响。在本研究中,我们将 FTS 采样柱与三个不同的泵相互连接,在 293 K 和 303 K 下以五个不同的采样率运行,并研究了 FTS 采样柱上多氯联苯、多环芳烃和 OCP 的突破曲线,以了解采样率(以通过 FTS 管横截面的线性风速 u 表示)对采样柱采样效率的影响。结果表明,FTS-PUF 色谱柱上的理论板数(N)和化合物突破体积的对数(logVB)与风速的倒数(1/u)呈线性关系。拟合线的斜率 (KNu) 与化合物的挥发性密切相关。风速变化对具有挥发性的化合物在取样柱上的 N 值的影响更大。对挥发性最强的多氯联苯的影响超过了多环芳烃和 OCP。此外,受风速影响的不同化合物的 logVB 斜率(KVB-u)与化合物挥发性(logPL)有显著相关性。与挥发性化合物相比,风速对低挥发性化合物突破量的影响更大。多元线性回归和 LSER 分析进一步证实,在不同温度和风速下,N 与 logVB 之间存在显著的正相关性(log(VB/m3)=2010/(T/K)-0.00066/(u/(m/s))+0.55N-5.41, R2=0.83, n = 423, p = 0)。因此,可以预测 FTS-PUF 采样柱在不同温度和风速/采样率下对各类化合物的收集性能。根据已知的采样空气量,可以估算出任何化学物质的突破水平,这为准确监测大气有机污染物浓度提供了宝贵的数据支持。
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Sampling efficiency of flow-through air sampler: Effect of sampling rate
The Flow Through Sampler (FTS) serves as an efficient wind-powered active sampling device, enabling the collection of a significant air volume within a short duration. Throughout the actual sampling process, the sampling rate of FTS experiences continuous fluctuations, highlighting the need for in-depth investigation into its impact on breakthrough. In this study, we interconnected the FTS sampling column with three distinct pumps, operating at five varied sampling rates under 293 K and 303 K; and breakthrough profiles of PCBs, PAHs and OCPs on the FTS sampling column were investigated to understand the impacts of sampling rate, expressed as linear wind velocity through the cross section of FTS tube (u) on the sampling efficiency of the sampling column. It revealed that the number of theoretical plates (N) and the logarithm of breakthrough volume (logVB) of compounds on the FTS-PUF column exhibit linear relationships with the inverse of wind velocity (1/u). The slopes of the fitted lines (KNu) are closely associated with the volatility of the compounds. Compounds with volatility experience a greater impact from variations in wind velocity on their N value on the sampling column. The effect on the most volatile PCBs surpasses that of PAHs and OCPs. Moreover, the slopes of logVB for different compounds affected by wind speed (KVB-u), display a significant correlation with compound volatility (logPL). Wind speed exerts a stronger influence on the breakthrough volume of low volatile compounds compared to volatile compounds. Multiple linear regression and LSER analysis further confirms a significant positive correlation between N and logVB across different temperatures and wind velocities (log(VB/m3)=2010/(T/K)-0.00066/(u/(m/s))+0.55N-5.41, R2=0.83, n = 423, p = 0). Therefore, the collection performance of the FTS-PUF sampling column for all types of compounds can be predicted under varying temperatures and wind velocitiess/sampling rates. Given the known sampled air volume, the breakthrough level for any chemicals can be estimated, which provids valuable data support for accurate monitoring of atmospheric organic pollutant concentrations.
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来源期刊
Journal of Chromatography A
Journal of Chromatography A 化学-分析化学
CiteScore
7.90
自引率
14.60%
发文量
742
审稿时长
45 days
期刊介绍: The Journal of Chromatography A provides a forum for the publication of original research and critical reviews on all aspects of fundamental and applied separation science. The scope of the journal includes chromatography and related techniques, electromigration techniques (e.g. electrophoresis, electrochromatography), hyphenated and other multi-dimensional techniques, sample preparation, and detection methods such as mass spectrometry. Contributions consist mainly of research papers dealing with the theory of separation methods, instrumental developments and analytical and preparative applications of general interest.
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