Tabulation of N2, O2, CO2, and He concentrations in soil gases collected daily for 11 months from 0.3-, 0.6-, 1.2-, and 2.0-m depths

1990 ◽  
Author(s):  
M.E. Hinkle
Keyword(s):  
Soil Gases

Helium in Phlegraean Fields soil gases: July 20th–26th — September 19th–25th, 1983

1984 ◽  
Vol 47 (2) ◽  
pp. 259-265 ◽  
Author(s):  
S. Lombardi ◽  
M. Filippo ◽  
L. Zantedeschi
Keyword(s):  
Phlegraean Fields ◽  
Soil Gases

scholarly journals Investigating Effects of Landfill Soil Gases on Landfill Elevated Subsurface Temperature

2020 ◽  
Vol 10 (18) ◽  
pp. 6401
Author(s):  
Samain Sabrin ◽  
Rouzbeh Nazari ◽  
Md Golam Rabbani Fahad ◽  
Maryam Karimi ◽  
Jess W. Everett ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Methodological Approach ◽  
The United States ◽  
Subsurface Temperature ◽  
Significance Level ◽  
Fire Hazards ◽  
Exothermic Reactions ◽  
The Us ◽  
Temperature Ranges ◽  
Soil Gases

Subsurface temperature is a critical indicator for the identification of the risk associated with subsurface fire hazards in landfills. Most operational landfills in the United States (US) have experienced exothermic reactions in their subsurface. The subsurface landfill area is composed of various gases generated from chemical reactions inside the landfills. Federal laws in the US mandate the monitoring of gases in landfills to prevent hazardous events such as landfill fire breakouts. There are insufficient investigations conducted to identify the causes of landfill fire hazards. The objective of this research is to develop a methodological approach to this issue. In this study, the relationship was investigated between the subsurface elevated temperature (SET) and soil gases (i.e., methane, carbon dioxide, carbon monoxide, nitrogen, and oxygen) with the greatest influence in landfills. The significance level of the effect of soil gases on the SET was assessed using a decision tree approach. A naïve Bayes technique for conditional probability was implemented to investigate how different gas combinations can affect different temperature ranges with respect to the safe and unsafe states of these gases. The results indicate that methane and carbon dioxide gases are strongly associated with SETs. Among sixteen possible gas combinations, three were identified as the most probable predictors of SETs. A three-step risk assessment framework is proposed to identify the risk of landfill fire incidents. The key findings of this research could be beneficial to landfill authorities and better ensure the safety of the community health and environment.

Resolution of the 15N balance enigma?

Soil Research ◽  
2001 ◽  
Vol 39 (6) ◽  
pp. 1419 ◽  
Author(s):  
T. J. Clough ◽  
R. R. Sherlock ◽  
K. C. Cameron ◽  
R. J. Stevens ◽  
R. J. Laughlin ◽  
...  
Keyword(s):  
Soil Surface ◽  
Rice Paddy ◽  
Organic N ◽  
15N Recovery ◽  
Soil Core ◽  
15N Balance ◽  
N Losses ◽  
Balance Sheets ◽  
Gas Tight ◽  
Soil Gases

The enigma of soil nitrogen balance sheets has been discussed for over 40 years. Many reasons have been considered for the incomplete recovery of 15N applied to soils, including sampling uncertainty, gaseous N losses from plants, and entrapment of soil gases. The entrapment of soil gases has been well documented for rice paddy and marshy soils but little or no work appears to have been done to determine entrapment in drained pasture soils. In this study 15N-labelled nitrate was applied to a soil core in a gas-tight glovebox. Water was applied, inducing drainage, which was immediately collected. Dinitrogen and N2O were determined in the flux through the soil surface, and in the gases released into the glovebox as a result of irrigation or physical destruction of the core. Other components of the N balance were also measured, including soil inorganic-N and organic-N. Quantitative recovery of the applied 15N was achieved when the experiment was terminated 484 h after the 15N-labelled material was applied. Nearly 23% of the 15N was recovered in the glovebox atmosphere as N2 and N2O due to diffusion from the base of the soil core, convective flow after irrigation, and destructive soil sampling. This 15N would normally be unaccounted for using the sampling methodology typically employed in 15N recovery experiments.

Sign in / Sign up

Export Citation Format

Share Document