Calcium carbonate and water pyrolysis measurements suggest minor adjustment to the VPDB and VSMOW-SLAP δ18O scale relation.

For these experiments the pyrolysis method was optimized. (concerning ratio additives and calcium carbonates and right pyrolysis temperature).

For every experiment there is an excel file with four sheets, namely raw data (data coming from IRMS-EA combination without any performed analysis), analysis (contains calculations), x-uncertainty, plots (contains fit line calculated with the water references). In the sheet x-uncertainty weighted fits for the normalization on the water references in the pyrolysis series where uncertainties in the x and y-coordinate are taken into account, were calculated.