Abstract
The composition of the major components (Na+, K+, Mg2+, Ca2+, Cl−, SO42−, Br) of a Mexican lagoon has been determined during evaporation (S = 44−186‰). Above a salinity of ≈90‰, the ratios of Ca:Cl and SO4:CI decreased, due to precipitation of CaSO4. The ratios of the other major constituents to CI were reasonably constant over the entire evaporation period. The initial Ca:Cl and HCO3:Cl ratios were lower than average seawater values, apparently due to precipitation of CaCO3. The densities of the lagoon waters were measured from 20° to 40°C and fit to an equation of the form (σ = 86 × 10−6 g·cm−3) urn:x-wiley:00243590:media:lno19822720315:lno19822720315-math-0001 where d0 is the density of water and A, B, and C are temperature parameters. The densities of the lagoon waters calculated from the composition data by using apparent molal volume data were in reasonable agreement with the measured values (within 600 × 10−6 g·cm−3)
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