Wood pellets emit CO, CO(2), CH(4), and other volatiles during storage. Increased concentration of these gases in a sealed storage causes depletion of concentration of oxygen. The storage environment becomes toxic to those who operate in and around these storages. The objective of this study was to investigate the effects of temperature, moisture, and the relative size of storage headspace on e...

possibility of very selective separations that depend on the geometry of the molecules to be separated rather than the more generalized solubility mechanisms acting in gas}liquid chromatography. It should be theoretically possible to design adsorbents for particular separations. In the branch of liquid chromatography known as afRnity chromatography, for example, it is already possible to manufa...

Connections with a local mental health service for young people, headspace, led to collaboration between local health service dietitian’s and headspace staff. This partnership enables early detection and treatment of young people with disordered eating in Tamworth NSW. A project identified the need to enhance staff awareness of nutrition and disordered eating, improved management of young peopl...

Production of high value products from glycerol via anaerobic fermentation is of utmost importance for the biodiesel industry. The microorganism Escherichia coli (E. coli) K12 was used for fermentation of glycerol. The effects of glycerol concentration and headspace conditions on the cell growth, ethanol and hydrogen production were investigated. A full factorial experimental design with 3 repl...

A new MIMS-derived technique, headspace membrane introduction mass spectrometry (HS-MIMS), is described for direct trace level analysis of volatile organic compounds (VOCs) in soil and other dry or wet solid matrixes. A silicone membrane interface is placed about 15 cm from the ion source, and a closed airspace (headspace) is created by connecting a toggle valve to the 1/4 in. tubing that conne...

The carbon-isotopic composition (delta13C) of soil-respired CO2 has been employed to evaluate soil carbon-cycling processes and the contribution of soil CO2 emissions to canopy and tropospheric air. These evaluations can be successful only when accurate isotope values of soil-respired CO2 are available. Here, we tested the robustness of delta13C values of soil-respired CO2 obtained after long i...

A solid-phase microextraction (SPME) procedure was evaluated for its application in measuring solute release in the headspace (HS) and in the liquid phase (DI) from emulsified and nanostructured materials. Limonene, a hydrophobic flavor compound present in many foods and beverages, was used as a model solute for evaluating the SPME method. Sampling conditions, including SPME fiber type, samplin...

Charcoal tubes are widely used for collecting organic vapor in the atmosphere, and the measurement is usually completed by analyzing an aliquot of the solvent phase following solvent extraction, typically with carbon disuhide. However, the sensitivity of this method is limited and sometimes too low for monitoring contaminants at trace levels in the environmental atmosphere. In this study, the p...

In this paper, a chromatographic method for the determination of volatile organic compounds (VOCs) as tool Gram-positive and Gram-negative bacterial strains identification was described. Direct Headspace gas chromatography coupled with mass spectrometry (Headspace-GC-MS) has been used qualitative VOCs emitted by certain (Salmonella Typhimurium, Escherichia coli, Serratia rubidae, Staphyloccocus...

Petroleum products and essential oils are produced used in large amounts categorized as Substances of Unknown or Variable composition, Complex reaction Biological materials (UVCBs). These UVCBs notorious difficult-to-test substances, since they complex mixtures hydrophobic volatile compounds. This study introduces two passive dosing (PD) approaches for whole UVCB toxicity testing: (1) headspace...