Abstract
An accurate, noniterative method for calculating the “calcite saturation index” for fresh to salt waters is presented. The results differ only ± 0.02 log-units on average and ± 0.05 log-units at most, from the results obtained with the computer program WATEQF ★. The method has been tested on 100 water samples, covering the following ranges in composition: pH = 4.35–9.5, Cl = 5–20,000 mg l −1, SO 4 = 0–3000 mg l −1, Ca = 1–2500 mg l −17, HCO 3 = 1–2500 mg l −1 and electrical conductivity = 100–53,000 μS cm −1 (20°C). The necessary input for the calculation consists of temperature, electrical conductivity, pH, alkalinity (as HCO 3), Ca and SO 4. The high computation speed and low number of input parameters make the method very applicable to programmable pocket calculators and for large databases like those used in regional hydrochemical research. A listing of a computerprogram in FORTRAN-77 is given in Appendix 1.
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