Major ion chemistry of Antarctic Saline Lakes

M(II) = total alkaline earths (Mg+Ca+Sr) Mg (mmol/kg and g/kg) calculated by difference Sr (mmol/kg and mg/kg) by flame-AAS Na (mol/kg and g/kg) by flame-AES K (mol/kg and g/kg) by flame-AES M(II) (mmol/kg) by potentio titrn (more accurate than photo titrn data) Mg (mmol/kg, g/kg) by difference (more accurate than data derived from photo titrn) - density of brine at 20 degrees C (g/cm3)

• calculated values of relative density (relative to water) at 20 degrees C, and specific gravity - ion balance error (%)
• calculated from selected mol/kg data for anions and cations - absolute salinity (g/kg)
• calculated from selected g/kg data for anions and cations - empirical composition-chlorinity relations for VH brines - empirical and theoretical density-chlorinity or density-salinity relations
• density expressed as relative density; vs chlorinity or absolute salinity; linear, quadratic, Root, Redlich
• density expressed as specific gravity; vs chlorinity or absolute salinity; linear, quadratic - residual sulphate concentrations form composition analysis of brines - composition functions for VH brines
• 'freezing' and 'gypsum' functions