18O Organic analysis

18O in organic material such as cellulose is analyzed using a heavily modified Carlo Erba with back flushing of the GC column in order to increase the precision. The long term external precision including all quality control samples has a standard deviation of ± 0.21 δ SMOW for IAEA cotton cellulose. Samples in the range of 1-1.5 mg weighed are usually used. They should be weighed out into part number for 3.5x5mm tin capsules #041060 ffrom Costech Analytical http://www.costechanalytical.com/downloads/download.aspx. Please contact us before preparing your samples so that we can discuss your application, sample sizes and sample preparation.