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, Article Highlights Sic-Abacus: An in-situ tool for estimating SIc and Pco2 in the context of carbonate karst-From calcite equilibrium equations, an abacus is built in the SIc=f(Pco 2 eq) reference frame. The abacus is named SIcAbacus
, Calculation for Saturation index with respect to calcite (SIc) is detailed. The range of values of SIc is discussed according to the uncertainty on pH, bicarbonate and calcium concentrations
, Consequences on SIc estimation of field estimations of bicarbonate and calcium concentrations from electrical conductivity are discussed
, Comparison of "measured SIc" and "estimated-SIc" on Cussac and Lascaux sites gave a goodness of fit of R²=0.99 and R²=0, p.91
, The SIc-Abacus can be used on field for decision making and is not aimed to replace complete calculation if SIc is needed for further studies