Sampling with Gas Bags I: Losses of Analyte with Time

Posner, Judd C.; Woodfin, William J.

doi:10.1080/08828032.1986.10390516

Cited by 17 publications

(8 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our results are consistent with others who have shown that recovery of certain VFAs, phenolic compounds, and indolic compounds from Tedlar bags are lower with increased residence time in the bag (Keener et al, 2002; Koziel et al, 2005). In fact, Posner and Woodfin (1986) recommend storage of air in Tedlar bags to be <4 h. The results of this study show that hold times as short as 0.5 h result in significant changes in odorant concentration for samples stored in Tedlar bags. While low storage temperatures (−20°C) clearly reduced the losses for certain odorants, severe and complete losses of other key livestock odorants, such as indole and 3‐methyl indole, indicate that this method is unacceptable as a sample preservation strategy.…”

Section: Discussionmentioning

confidence: 79%

Bias of Tedlar Bags in the Measurement of Agricultural Odorants

Trabue¹,

Anhalt²,

Zahn³

2006

J of Env Quality

129

115

View full text Add to dashboard Cite

Odor regulations typically specify the use of dynamic dilution olfactometery (DDO) as a method to quantify odor emissions, and Tedlar bags are the preferred holding container for grab samples. This study was conducted to determine if Tedlar bags affect the integrity of sampled air from animal operations. Air samples were collected simultaneously in both Tedlar bags and Tenax thermal desorption tubes. Sample sources originated from either a hydrocarbon-free air tank, dynamic headspace chamber (DHC), or swine-production facility, and were analyzed by gas chromatography-mass spectrometry-olfactometry (GC-MS-O). Several background contaminants were identified from Tedlar bags, which included the odorous compounds N,N-dimethyl acetamide (DMAC), acetic acid, and phenol. Samples from the DHC demonstrated that recovery of malodor compounds was dependent on residence time in the Tedlar bag with longer residence time leading to lower recovery. After 24 h of storage, recovery of C3-C6 volatile fatty acids (VFA) averaged 64%, 4-methylphenol and 4-ethylphenol averaged 10%, and indole and 3-methylindole were below the detection limits of GC-MS-O. The odor activity value (OAV) of grab samples collected in Tedlar bags were 33 to 65% lower following 24 h of storage. These results indicate that significant odorant bias occurs when using Tedlar bags for the sampling of odors from animal production facilities.

show abstract

Section: Discussionmentioning

confidence: 79%

Bias of Tedlar Bags in the Measurement of Agricultural Odorants

Trabue¹,

Anhalt²,

Zahn³

2006

J of Env Quality

129

115

View full text Add to dashboard Cite

show abstract

“…17 The breath was then flowed into the SIFT over a period of about one minute whilst the downstream mass spectrometer was scanned over the mass range 10 u to 100 u. In this way several trace gases are detected and quantified simultaneously, including ammonia, but obviously the concentrations determined in this way are not the alveolar (peak) concentrations but rather some mean concentrations resulting from the mixing of alveolar breath and breath from the mouth and the upper airways.…”

Section: Resultsmentioning

confidence: 99%

Quantification of ammonia in human breath by the selected ion flow tube analytical method using H3O+ and O2+ precursor ions

Španěl

Davies

Smith

1998

Rapid Commun. Mass Spectrom.

View full text Add to dashboard Cite

We show how our selected ion flow tube mass spectrometric technique for trace gas analysis can be used to determine the concentrations of ammonia in alveolar breath from single exhalations using both H30+ and 02+ precursor ions for chemical ionization. Thus, data are presented of the alveolar ammonia concentrations in the breath of six healthy volunteers following the ingestion of a liquid protein meal, which show that consistent values are obtained using these two precursor ions. Alveolar breath ammonia concentrations (which range from 200 to 1750 ppb in these individuals) are compared with those obtained from bag samples of breath from the same individuals.

show abstract

“…As VOCs collected in sampling bags were typically analyzed within a short period of time (usually less than 24-48 hours after sampling) [5,15,19], there were also a few experiments for analysis within three days. e stability of VOCs from stationary sources in the refinery and petrochemistry was evaluated in the sampling bags for 6 days in this study.…”

Section: Experimental Programmentioning

confidence: 99%

“…Whole-air sampling and sorbent-based tubes sampling methods are the most widely used techniques for collecting gaseous VOCs under on-site or laboratory conditions [14,15]. Among them, whole-air sampling techniques include airbag sampling and tank sampling.…”

Section: Introductionmentioning

confidence: 99%

Storage Stability of Volatile Organic Compounds from Petrochemical Plant of China in Different Sample Bags

Han

Zhong

et al. 2020

Journal of Analytical Methods in Chemistry

View full text Add to dashboard Cite

According to the emission characteristics of volatile organic compounds (VOCs) in the petrochemical plants of China, the storage stability of VOCs for two different bags, polyester aluminum (PEA) and polyvinyl fluoride (PVF), was investigated in this study by comparing the adsorption of gas samples. A series of experiments were carried out to study the impact of different factors of sampling in the petrochemical industry. The results showed that the C2∼C3 substances can be adsorbed by the Tedlar bag, and after being refilled with pure nitrogen, the VOCs adsorbed previously by the bag material can be released. The aromatic hydrocarbon VOCs with larger molecular weight had a relatively lower recovery rate than the smaller molecular weights. And the average recovery of PEA airbags was significantly better than that of PVF airbags for storing stationary VOCs in the refinery of China. More kinds of substances can be detected in the airbags that had been added with helium protective gas, and it had a higher recovery rate for both kinds of simple bags after 24 hours of storage time, which indicated that the airbags without protective gas had adsorbed these substances.

show abstract

Sampling with Gas Bags I: Losses of Analyte with Time

Cited by 17 publications

References 4 publications

Bias of Tedlar Bags in the Measurement of Agricultural Odorants

Bias of Tedlar Bags in the Measurement of Agricultural Odorants

Quantification of ammonia in human breath by the selected ion flow tube analytical method using H3O+ and O2+ precursor ions

Storage Stability of Volatile Organic Compounds from Petrochemical Plant of China in Different Sample Bags

Contact Info

Product

Resources

About