scholarly journals Extraction Methods for Recovery of Volatile Organic Compounds from Fortified Dry Soils

1996 ◽  
Vol 79 (5) ◽  
pp. 1198-1204 ◽  
Author(s):  
Marti M Minnich ◽  
John H Zimmerman ◽  
Brian A Schumacher
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Carbon ◽  
Organic Compounds ◽  
Methanol Extract ◽  
Extraction Methods ◽  
Low Level ◽  
Methanol Treatment ◽  
Volatile Organic ◽  
High Level ◽  
Treatment Order

Abstract Recovery of 8 volatile organic compounds (VOCs) from dry soils, each fortified at 800 ng/g soil, was studied in relation to the extraction method and time of extraction. Extraction procedures studied on 2 desiccator-dried soils were modifications of EPA low- and high-level purge-and-trap extractions (SW-846 Method 5030A): treatment 1, unmodified low-level procedure; treatment 2,18 h water presoak followed by low-level procedure; treatment 3, 24 h methanol extract at room temperature followed by high-level procedure; and treatment 4, 24 h methanol extract at 65°C followed by highlevel procedure. VOC recoveries from replicate soil samples increased in the treatment order 1 through 4. With Charleston soil (8% clay and 3.8% organic carbon), highly significant differences (p ≤ 0.001) in recoveries among treatments were observed for trichloroethene (TCE), tetrachloroethene (PCE), toluene, ethylbenzene, and o-xylene, with 2- to 3- fold increased recoveries between treatments 1 and 3. With Hayesville soil (32% clay and 0.2% organic carbon), significant improvements (p ≤ 0.05) in recoveries of toluene, ethylbenzene, o-xylene, 1,1,1-trichloroethane, TCE, and PCE were observed for heated methanol (treatment 4) rather than water extraction (treatment 1), but the increases were less than 2-fold.

scholarly journals Treatment Efficiency by means of a Nonthermal Plasma Combined with Heterogeneous Catalysis of Odoriferous Volatile Organic Compounds Emissions from the Thermal Drying of Landfill Leachates

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Daniel Almarcha ◽  
Manuel Almarcha ◽  
Elena Jimenez-Coloma ◽  
Laura Vidal ◽  
Montserrat Puigcercós ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Carbon ◽  
Total Organic Carbon ◽  
Organic Compounds ◽  
Nonthermal Plasma ◽  
Sulphur Compounds ◽  
Odor Concentration ◽  
Volatile Organic ◽  
Thermal Drying ◽  
Urban Solid Waste

The objective of the present work was to assess the odoriferous volatile organic compounds depuration efficiency of an experimental nonthermal plasma coupled to a catalytic system used for odor abatement of real emissions from a leachate thermal drying plant installed in an urban solid waste landfill. VOC screening was performed by means of HRGC-MS analysis of samples taken at the inlet and at the outlet of the nonthermal plasma system. Odor concentration by means of dynamic olfactometry, total organic carbon, mercaptans, NH3, and H2S were also determined in order to assess the performance of the system throughout several days. Three plasma frequencies (100, 150, and 200 Hz) and two catalyst temperatures (150°C and 50°C) were also tested. Under conditions of maximum capacity of the treatment system, the results show VOC depuration efficiencies around 69%, with average depuration efficiencies between 44 and 95% depending on the chemical family of the substance. Compounds belonging to the following families have been detected in the samples: organic acids, alcohols, ketones, aldehydes, pyrazines, and reduced sulphur compounds, among others. Average total organic carbon removal efficiency was 88%, while NH3and H2S removal efficiencies were 88% and 87%, respectively, and odor concentration abatement was 78%.

Low-Level Detections of Halogenated Volatile Organic Compounds in Groundwater: Use in Vulnerability Assessments

2008 ◽  
Vol 13 (11) ◽  
pp. 1049-1068 ◽  
Author(s):  
L. Niel Plummer ◽  
Eurybiades Busenberg ◽  
Sandra M. Eberts ◽  
Laura M. Bexfield ◽  
Craig J. Brown ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Groundwater Use ◽  
Low Level ◽  
Vulnerability Assessments ◽  
Volatile Organic

Development of instrumentation for simultaneous analysis of total non-methane organic carbon and volatile organic compounds in ambient air

2003 ◽  
Vol 37 ◽  
pp. 149-158 ◽  
Author(s):  
Christophe Maris ◽  
Myeong Y. Chung ◽  
Richard Lueb ◽  
Udo Krischke ◽  
Richard Meller ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Carbon ◽  
Organic Compounds ◽  
Ambient Air ◽  
Simultaneous Analysis ◽  
Volatile Organic

Evaluation of the Economic Efficiency of the Associated Petroleum Gas Application for the GTL Technology

2021 ◽  
Vol 624 (2) ◽  
pp. 44-49
Author(s):  
A. Kh. Ozdoeva ◽  
Keyword(s):  
Volatile Organic Compounds ◽  
Nitrogen Oxide ◽  
Organic Compounds ◽  
Economic Efficiency ◽  
Oil Production ◽  
Oil Fields ◽  
Associated Petroleum Gas ◽  
Low Level ◽  
Volatile Organic ◽  
Technical Documents

The main problem still remains a rather low level of useful use of associated components of oil production and, consequently, a high percentage of combustion of associated hydrocarbon compounds. In addition, companies are increasing the amount of costs aimed at reducing volatile organic compounds and nitrogen oxide every year, which significantly reduces the productivity of equipment. Based on the analysis of existing practices, the economic prospects are evaluated and recommendations for the targeted use of APG are formulated. The study briefly outlines technologies for reducing on-site flaring that are applicable in hard-to-recover oil fields. Information on technologies is collected and evaluated from a review of previous studies, technical documents, and analysis of open international sourcess.

Preparation of Spiked Soils by Vapor Fortification for VolatUe Organic Compounds Analysis

1994 ◽  
Vol 77 (3) ◽  
pp. 735-737
Author(s):  
Alan D Hewitt
Keyword(s):  
Quality Control ◽  
Quality Assurance ◽  
Volatile Organic Compounds ◽  
Organic Compound ◽  
Organic Compounds ◽  
Volatile Organic Compound ◽  
Vadose Zone ◽  
Extraction Methods ◽  
Closed Container ◽  
Volatile Organic

Abstract This paper describes a vapor fortification method for preparing quality assurance/quality control soils for volatile organic compound analysis. Treatment of soils with volatile organic compounds occurs in a closed container in a manner somewhat analogous to the way the vadose zone often becomes contaminated. One advantage of this method for preparing soils for quality assurance/quality control purposes is that the efficiency of various extraction methods can be reliably compared. Furthermore, by substantially reducing the error due to sample inhomogeneity, the error associated with the determinative step can also be properly evaluated.

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