Tedlar Bag Sampling Technique for Vertical Profiling of Carbon Dioxide through the Atmospheric Boundary Layer with High Precision and Accuracy

Schulz, K.; Jensen, Mark J.; Balsley, B. B.; Davis, Kenneth J.; Birks, John W.

doi:10.1021/es035046h

Cited by 14 publications

(14 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The sampling techniques include direct sampling, partly using sample loops [41][42][43][44], Tedlar bags [45][46][47][48], SPME [4,5,[49][50][51] and different adsorbents [20,26,52]. In all cases mentioned, a non-invasive and easy method for early diagnosis or therapy monitoring should be developed by identifying diseasespecific biomarkers in the breath of patients.…”

Section: Introductionmentioning

confidence: 99%

One-year time series of investigations of analytes within human breath using ion mobility spectrometry

Bunkowski

Maddula

Davies

et al. 2010

Int. J. Ion Mobil. Spec.

View full text Add to dashboard Cite

Ion mobility Spectrometry is used to detect volatile analytes within human breath directly. Many volatile organic compounds (VOC) show significant dayto-day variation in the signal height related to the concentration of the analyte, although the breath collection had been performed under the same conditions with respect to similar sampling procedure, similar dead volume, similar measurement time, and measurement conditions. Variations of 8 different analytes are investigated over a time period of 11 months in the exhaled breath of the same person in the same room environment. The individual variability is reported for Benzothiazole; D-Limonene; Eucalyptol; Decamethylcyclopentasiloxane; Decanal; 1-Hexanol, 2-ethyl-; Cyclohexanone, 5-methyl-2-(1-methylethyl) and Nonanal. The paper shows, that the individual variability must be taken into consideration to relate the findings to medical questions. Therefore, the room air concentration of VOCs must be taken into account, so that the difference between exhaled and inhaled air has to be used as indicator. Finally, starting with individual variabilities, the normal variation related to the specific analyte should be considered in addition.

show abstract

Section: Introductionmentioning

confidence: 99%

One-year time series of investigations of analytes within human breath using ion mobility spectrometry

Bunkowski

Maddula

Davies

et al. 2010

Int. J. Ion Mobil. Spec.

View full text Add to dashboard Cite

show abstract

“…The uptake of carbon dioxide due to photosynthesis slowly decreases in the evening and ceases approximately at the sunset. Correspondingly, from the afternoon to the sunset, the distribution of CO 2 concentration undergoes a change from increasing with height to decreasing with height (see Schulz et al 2004). After sunset the surface uptake of CO 2 by vegetation ceases, and soil/plant respiration once again enriches the surface layer with CO 2 .…”

Section: Introductionmentioning

confidence: 99%

“…Concentration measurements of CO 2 , SO 2, NH 3 , and other trace gases in the atmospheric boundary layer revealed vertical (altitudinal) dependence of the concentrations (see Georgii 1978;Gravenhorst et al 1978;Pé rez-Landa et al 2007;Georgii and Mü ller 1974;Schulz et al 2004). The concentration of gases that are not associated with photosynthesis (e.g., SO 2 and NH 3 ) has a maximum at the earth's surface and decreases with height over the continents.…”

Section: Introductionmentioning

confidence: 99%

Effect of Altitude Concentration Gradient of Soluble Gaseous Pollutants on Their Scavenging by Falling Rain Droplets

Elperin

Fominykh

Krasovitov

2009

Journal of the Atmospheric Sciences

View full text Add to dashboard Cite

This paper analyzes absorption of soluble atmospheric trace gases by falling rain droplets with internal circulation, which is caused by interfacial shear stresses. It is assumed that the concentration of soluble trace gases in the atmosphere varies in a vertical direction. In the analysis the accumulation of the absorbate in the bulk of the falling rain droplet was accounted for. The problem is solved in the approximation of a thin concentration boundary layer in the droplet and in the surrounding air. It was assumed that the bulk of a droplet, beyond the diffusion boundary layer, is completely mixed and that concentration of the absorbate is homogeneous and time dependent in the bulk. By combining the generalized similarity transformation method with Duhamel's theorem, the system of transient conjugate equations of convective diffusion for absorbate transport in liquid and gaseous phases with time-dependent boundary conditions is reduced to a linear-convolution Volterra integral equation of the second kind, which is solved numerically. It is shown that the nonuniform vertical distribution of absorbate in a gaseous phase strongly affects mass transfer during gas absorption by a falling droplet.

show abstract

“…The sampling techniques include direct sampling, partly using sample loops [41][42][43][44], Tedlar bags [45][46][47][48], SPME [4, 5, [49][50][51] and different adsorbents [20,26,52]. In all cases mentioned a non-invasive and easy method for early diagnosis or therapy monitoring should be developed by identifying disease-specific biomarkers in the breath of patients.…”

Section: Introductionmentioning

confidence: 99%

Detection of infectious agents in the airways by ion mobility spectrometry of exhaled breath

Rabis

Sommerwerck

Anhenn

et al. 2011

Int. J. Ion Mobil. Spec.

View full text Add to dashboard Cite

Diseases of the lung, e. g. chronic obstructive pulmonary disease (COPD), interstitial lung diseases, bronchiectasis or cystic fibrosis, often lead to recurrent severe respiratory infections that cause exacerbations of the underlying disease. These acute or chronic inflammatory processes can result in a progressive destruction of the lung and in an ongoing decline in lung function. Therefore longer inpatient stays for intravenous antibiotic treatment are necessary and the quality of life in these patients is severely limited. A rapid detection of infectious agents in human lungs is often crucial, because the choice of the appropriate therapeutic regime depends at first on the identification of the infecting species. Standard methods for detection and identification are either time consuming, of low sensitivity or expensive. It is known that bacteria, and also mitosporic fungi, produce volatile organic compounds (VOCs) that can be detected in exhaled breath by ion mobility spectrometry (IMS), were a distinct detection of a specific VOC is related to a "peak". We investigated, whether the detection and characterisation of VOCs by Multi-capillary column coupled to IMS in exhaled breath of patients whose airways are either infected or colonized by Pseudomonas aeruginosa compared to healthy non-smoker controls is capable of identifying those infectious agents. To realize a non invasive identification of pathogens, the exhaled breath of 53 persons (24 patients suffering chronic or infectious on Pseudomonas and 29 healthy controls) was investigated using an ion mobility spectrometer type BioScout. In total 224 different signals were found. Actually, 21 different signals are able to differentiate the two groups, Control and Pseudomonas, with rank sum values less than 0.2. For all 224 signals Box-and-Wisker plots were realized. The peaks with the lowest rank sum values F (0,107) and PS0 (0,112) show rather good separation of both groups. Our preliminary results demonstrate that distinct patterns of a small number of IMSpeaks are sufficient for the identification of these infectious agents. Therefore MCC-IMS seems to be a promising method for the non-invasive identification of patients which are colonized or infected with bacteria such as Pseudomonas aeruginosa.

show abstract

Tedlar Bag Sampling Technique for Vertical Profiling of Carbon Dioxide through the Atmospheric Boundary Layer with High Precision and Accuracy

Cited by 14 publications

References 10 publications

One-year time series of investigations of analytes within human breath using ion mobility spectrometry

One-year time series of investigations of analytes within human breath using ion mobility spectrometry

Effect of Altitude Concentration Gradient of Soluble Gaseous Pollutants on Their Scavenging by Falling Rain Droplets

Detection of infectious agents in the airways by ion mobility spectrometry of exhaled breath

Contact Info

Product

Resources

About