Dataset of electrical conductivity coefficients for the GWB programs Dataset format: apr14 method: APHA * Data file of coefficients for calculating the electrical conductivity * of electrolyte solutions, for use by the GWB programs. * * The calculation follows the procedure outlined in "Standard Methods for the * Examination of Water and Wastewater", Section 2510 A, and the coefficients * that follow are from that source. Note that the GWB programs do not assume * complete ionization; they use free species concentrations rather than total * concentrations in performing the calculations. * * EC_Tmin, EC_Tmax, EC_Imax are the minimum and maximum temperatures and * the maximum ionic strength over which the GWB programs will calculate a * value for electrical conductivity. EC_Tmin 20.0 EC_Tmax 30.0 EC_Imax 0.5 * Data specific to the contribution to conductivity of various species follows. * Only the species listed contribute to conductivity, and the spelling of the species * name must match that of the species in the thermodynamic dataset in use. The * contribution of minor species and neutrally charged species to conductivity is * negligible and those species need not be listed here. * * The coefficients listed for each species are the equivalent ionic conductance * under standard conditions (lambda-0, in uS-cm2/meq) and the derivative * d(lambda-0)/dT of this value with temperature (uS-cm2/meq-C). H+ 350.0 0.0139 Ca++ 59.5 0.02 Ca+2 59.5 0.02 Mg++ 53.1 0.02 Mg+2 53.1 0.02 Na+ 50.1 0.02 K+ 73.5 0.02 NH4+ 73.5 0.02 Fe++ 54.0 0.02 Fe+2 54.0 0.02 Fe+++ 68.0 0.02 Fe+3 68.0 0.02 OH- 198.6 0.0139 HCO3- 44.5 0.02 CO3-- 72.0 0.02 CO3-2 72.0 0.02 SO4-- 80.0 0.02 SO4-2 80.0 0.02 Cl- 76.4 0.02 CH3COO- 40.9 0.02 Acetate 40.9 0.02 Acetate- 40.9 0.02 F- 54.4 0.02 NO3- 71.4 0.02 H2PO4- 33.0 0.02 H2(PO4)- 33.0 0.02 HPO4-- 57.0 0.02 HPO4-2 57.0 0.02