nsayy.blogg.se - Water cad pricing

Soil samples that contain at least 8% Gravimetric Water Content (GWC) (lower GWC can be analyzed but accuracy will be reduced.).

Determining the stable isotope composition of pore water from saturated and unsaturated zone core: improvements to the direct vapour equilibration laser spectrometry method.

High Resolution Pore Water δ2H and δ18O Measurements by H2O (liquid)−H2O (vapor) Equilibration Laser Spectroscopy. Please note that between September and April inclusive samples must be shipped in insulated containers in order to prevent freezing!! If samples freeze the vial shatters and your sample is gone!ĭirect Vapour Equilibration: Soil Water Methodology Samples must be well packaged to reduce breakage! *Prices include sample transfer and filtering. All samples will be scanned for volatile organic compound contamination with LGR’s Spectral Contamination software. All values are reported as parts per thousand (δ or per mil) according to the Vienna Standard Mean Ocean Water-Standard Light Antarctic Precipitation (VSMOW-SLAP) scales. Our lab maintains an accuracy of ≤ ☑.0 for D/H and ☐.2 for 18O/ 16O and 17O/ 16O.

Samples must be stored in well-sealed vials (no evaporation!) with little to no headspace.

Freshwater (no saline or samples containing volatile organics).

Volume minimum 2 ml/sample (please contact the lab if you have lower than 2 ml water volumes).

The lab is capable of measuring the ratios of D/H, 18O/ 16O and 17O/ 16O isotopes of fresh water and soil water samples. The McDonnell Lab is equipped with several Los Gatos Research (LGR) liquid and vapor water Off-Axis Integrated-Cavity Output Spectroscopy (Off-Axis ICOS) machines for the analysis of stable isotopes of water. Laser Spectroscopy: Liquid Water Isotope Analysis