The electrical conductivity of weight diluted and concentrated standard seawater as a function of salinity and temperature

The ratiosRs,t,oof electrical conductivity of seawater samples of precisely known salinity to standard seawater at the same temperature have been measured over a wide range of salinities from 0 to42 and over the full range of oceanic temperatures from -2 to35. The samples withS<35 prepared by accurate weight dilution of standard seawater with distilled water. High salinity samples were prepared by fast evaporation of standard seawater and subsequent weight dilution into the already determined35. An equation was derived which expresses the S versusRs,t,orelationship very precisely from1-42 at all temperatures, i.e.,S = f₁(Rs,t,o) + f₂(Rs, t,o,t) =Σₙ₌₀⁵ aₙRn/2+ Δ t/1+kΔ t Σₙ₌₀⁵ bₙRn/2whereΔ t = t-15,R = Rs, t.o; only the first termf₁is required at15. The effeet of temperature on the electrical conductivity of standard seawater was also measured. The ratiorₜof the conductivity at temperaturetto the conductivity at15 (C35,t, o/C35,15,o) is very aeenrately expressed by a fourth degree equation int. i.e,rₜ=Σₙ₌₀⁴ cₙtⁿThese two equations are sufficient for all salinity determinations at normal atmospheric pressure.