European project: Metrology for Chemical Pollutants in Air

Baldan, Annarita

doi:10.1051/metrology/201310002

Cited by 3 publications

(6 citation statements)

References 3 publications

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“…For monitoring air quality and air pollution levels of these compounds, measurements take place in ambient and indoor air, up to measuring of vertical VOC profiles in the atmosphere to better model and monitor their impact on climate. [1][2][3][4][5][6] VOC concentrations in the background atmosphere are typically in the low range of a few pmol•mol −1 to a few nmol•mol −1 and require measurement techniques with very high sensitivity that are adapted depending on the concentration and compound to be detected (Table 1 in 6 ). Gas chromatographs with flame ionisation detectors and mass spectroscopy detectors are currently the most commonly used VOC measuring instruments, but also Fourier transform infrared spectroscopy, cavity ringdown spectroscopy, portable monitors and direct sensor techniques specified for individual VOCs, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…for breath analysis, are used. 1,2,[4][5][6] Good calibration standards are essential for metrological traceability and comparability.…”

Section: Introductionmentioning

confidence: 99%

“…In order to minimise the interaction with the surfaces, the state of research also includes the use of different surface treatments of the containers, gas cylinders and the components used, such as filters and pipe systems in the measurement setup. [2][3][4][5][6][7] The development of the gas cell presented here is linked to this issue. While it is interesting to understand the adsorption behavior fundamentally and quantify adsorbed material, also the adsorption mechanisms can be utilized as a means of reducing the amount of pollutants in the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

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In situ gas cell for the analysis of adsorption behavior on surfaces using x-ray spectroscopy

Streeck¹,

Grötzsch²,

Weser³

et al. 2022

Preprint

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A gas cell for in-situ measurements of Volatile Organic Compounds (VOCs) and their adsorption behavior on different surfaces by means of X-Ray Fluorescence (XRF) and X-ray Absorption Fine-Structure (XAFS) spectroscopy has been developed. The cell is especially designed to allow for the efficient excitation and detection of low-Z elements such as carbon, oxygen or nitrogen as main components of VOCs. Two measurement modes are available. In the surface mode, adsorption on a surface can be studied using XAFS by fluorescence detection under shallow angles of incidence. The transmission mode enables the simultaneous investigation of gaseous samples via XAFS in transmittance and fluorescence detection modes. Proof-of-principle experiments were performed at the PTB plane grating monochromator beamline for soft x-ray radiation at the synchrotron radiation facility BESSY II. The flexible design and high versatility of the cell are demonstrated with the investigation of ethanol (EtOH) as one of the most abundant VOCs. The comparison of Near-Edge X-ray Absorption Fine-Structure (NEXAFS) spectra under transmission and fluorescence detection in the gas phase with measurements of adsorbed molecules on a Si-wafer surface both at the C and O-K absorption edges proves the applicability of the cell for the monitoring of adsorption processes.

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Section: Introductionmentioning

confidence: 99%

“…for breath analysis, are used. 1,2,[4][5][6] Good calibration standards are essential for metrological traceability and comparability.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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In situ gas cell for the analysis of adsorption behavior on surfaces using x-ray spectroscopy

Streeck¹,

Grötzsch²,

Weser³

et al. 2022

Preprint

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“…The joint research programme (JRP) Metrology for Chemical Pollutants in Air (MACPoll) within the European Metrology Research Programme (EMRP) of Euramet [1] consisted of a total of six work packages (WP). The overall project objective of the programme was to establish the basis for measuring accurate and robust air quality data of reactive air pollutants for their short and long term assessment [2]. The maximum allowed levels of pollutants in ambient air in the European Union are regulated in the European Directive on ambient air quality and cleaner air for Europe [3].…”

Section: Introductionmentioning

confidence: 99%

Dilution and permeation standards for the generation of NO, NO₂and SO₂calibration gas mixtures

Haerri

Macé

Waldén

et al. 2017

Meas. Sci. Technol.

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The evaluation results of the metrological performance of a dilution and a permeation standard for generating SI-traceable calibration gas mixtures of NO, SO2 and NO2 for ambient air measurements are presented. The composition of the in situ produced reference gas mixtures is calculated from the instantaneous values of the input quantities of the generating standards. In a measurement comparison, the calibration and measurement capabilities of five laboratories were evaluated for the three analytes at limiting amount of substance fractions in ambient air between 20 and 150 nmol mol−1. For the upper generated reference values the target relative uncertainties of ⩽2% (for NO and SO2) and ⩽3% (for NO2) for evaluating the laboratory results were fulfilled in 12 out of 13 cases. For the analytical results seven out of nine laboratories met the criteria for the upper values for NO and NO2, for SO2 it was one out of four. From the negative degrees of equivalence of all NO2 comparison results it was supposed that the permeation rate of NO2 through the FEP polymer membrane of the permeator was different in air and N2. Subsequent precision permeation measurements with various carrier gases revealed that the permeation rate of NO2 was ≈0.8% lower in synthetic air compared to N2. With the corrected NO2 reference values for air the degrees of equivalence of the laboratory results were improved and closer to be symmetrically distributed.

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“…We developed absolute laser hygrometers which are used in atmospheric research [5], combustion research [6,7], or to measure humidity in natural gas or biogas for quality assurance purposes [8]. In the framework of the completed EMRP project MacPoll [9] we developed an absolute spectrometer targeting CO2 and H2O to DOI: 10.1051/ C Owned by the authors, published by EDP Sciences, 2015 2015 m 0 00 etrolo / gy validate the CO2 concentration and humidity in zero gas which is used to check the zero-reading of calibrated sensors and as dilution gas for reference gas mixtures [10]. In the currently running EMRP projects MetAMC [11] and MetNH3 [12] we work on reliable online detection of NH3 in clean rooms based on cavity ring-down spectroscopy (CRDS) and photoacoustic spectroscopy (PAS), and on a traceable optical transfer standard for NH3 detection based on a commercial CRDS spectrometer, respectively.…”

Section: Introductionmentioning

confidence: 99%

Traceable amount of substance fraction measurements in gases through infrared spectroscopy at PTB

Lüttschwager¹,

Pogány²,

Nwaboh³

et al. 2015

17th International Congress of Metrology

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Abstract. Gas analysis has become an important task in various fields of science and industry, especially through techniques based on laser spectroscopy. Common applications are, for example, the monitoring of the atmosphere to assess human impact on ecosystems and the climate, the monitoring of airborne molecular contamination to supervise sensitive high-tech processes like semiconductor manufacturing, or the analysis of combustion processes. High resolution laser spectroscopy lends itself particularly well for gas analysis, as it is fast, selective, and the results can be made traceable to the SI units. Traceability is of particular importance to maximize the reliability of measurement results, especially if such measurements are the input for complicated models like those used in climate research or if impacting political decisions. In this contribution we give an overview on our approach to achieve traceability of results from spectroscopic amount fraction measurements of H2O, CO2, and NH3 including the TILSAM method (traceable infrared laser-spectrometric amount fraction measurement). We discuss how this method applies to tunable diode-laser absorption spectroscopy (TDLAS), cavity ring-down spectroscopy (CRDS), and photoacoustic spectroscopy (PAS). This research is partly embedded in projects within the European Metrology Research Programme (EMRP).

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European project: Metrology for Chemical Pollutants in Air

Cited by 3 publications

References 3 publications

In situ gas cell for the analysis of adsorption behavior on surfaces using x-ray spectroscopy

In situ gas cell for the analysis of adsorption behavior on surfaces using x-ray spectroscopy

Dilution and permeation standards for the generation of NO, NO₂and SO₂calibration gas mixtures

Traceable amount of substance fraction measurements in gases through infrared spectroscopy at PTB

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European project: Metrology for Chemical Pollutants in Air

Cited by 3 publications

References 3 publications

In situ gas cell for the analysis of adsorption behavior on surfaces using x-ray spectroscopy

In situ gas cell for the analysis of adsorption behavior on surfaces using x-ray spectroscopy

Dilution and permeation standards for the generation of NO, NO2and SO2calibration gas mixtures

Traceable amount of substance fraction measurements in gases through infrared spectroscopy at PTB

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Product

Resources

About

Dilution and permeation standards for the generation of NO, NO₂and SO₂calibration gas mixtures