DVS measurement of water vapour sorption by Pine wood Wood is an important natural resource that is used around the world for building and construction. Since it is a versatile material from renewable sources, it is likely to continue to play a significant role in construction in the future. As such, different woods must be

Determining Sources and Cycling of Nitrate in an Agricultural Catchment Using δ15N and δ18O in Nitrate Understanding the nitrogen cycle is increasingly important. Humans have more than doubled the annual global production of reactive nitrogen, negatively impacting water quality, and terrestrial and coastal ecosystems. Agricultural activity is a major source of anthropogenic reactive nitrogen. It

Determination of multicomponent mass transport processes for adsorptive environmental applications Introduction The study of the kinetics of the competitive adsorption of multicomponent gas mixtures on solid adsorbents is important for a range of practical adsorption processes. One such environmental application is carbon capture and storage (CCS) [1], which includes the use of geological CO2 storage

Detecting Substitution of Organic Tomatoes with Conventionally Grown Products Using δ15N ‰ Analysis Authentic samples of commercially produced organic and conventionally grown tomatoes were collected and analysed for their δ15N composition in order to assemble datasets to establish if there were any systematic differences in nitrogen isotope composition due to the method of production. The

Continuous Flow Isotopic Analysis of Small Carbonate Samples (10-90µg) using a Sercon GSL Introduction The GSL Carbonate set-up allows for the analysis of δ13C and δ18O isotopes in carbonate samples from 10 to 500µg with a high degree of accuracy and precision. Data from carbonates, for example, can be used to build accurate palaeoclimates. The

Concentration dependence of the microscopic mobility of water in polymer membranes Introduction Gravimetric vapor sorption provides the means for simultaneous determination of the isothermal concentration of water vapor and the chemical diffusion coefficient given a defined sample geometry such as a polymer film. The present study determines both properties for two polymer packaging films, one

Comparison of water and ethanol vapor sorption and transport in a polymer membrane   Introduction Polymer materials to be used as protective packaging need tohave their sorption and permeability characteristicsmeasured in order to assess their suitability for their task. TheIGA gravimetric sorption analyzer provides the ability tocharacterize and test new materials. Download Application Report

Comparison of gravimetric carbon dioxide compressibility data with four cubic equations of state   Introduction Gravimetric analysis provides direct measurement of gasphase and sample density given that they both contribute theupthrust due to buoyancy (Archimedes’ Law). This force mustbe adequately corrected in order to convert weight readingsto mass uptake in gravimetric sorption experiments. Thecontribution of

CN analysis in very small samples using the Integra2 The Inetgra2 has expanded capability to measure C and N by elemental analysis – isotope ratio mass spectrometry (EA-IRMS). The extended range modifications now enable researchers to get down to sample sizes as low as 2.5 µg C and 1.5 µg N whilst maintaining excellent precision.

Climatic testing of electrical components The electrical conductance of a material may vary with moisture content. Therefore the quality of an electrical component may degrade due to the diffusion of moisture into the material from the atmosphere. For this reason an international standard was devised for materials to be used as electrical components. Details of