Chemical and Isotopic Variations with Depth: a Detailed Saturated Zone Profile of a 140m Thick Coastal Aquifer Academic Article uri icon

abstract

  • A percussion borehole was constructed through the saturated zone of the Mediterranean coastal aquifer in Tel Aviv, Israel, penetrating its three subaquifers and the upper part of the underlying Saqiye aquitard. The research site was previously subjected to direct industrial contamination and is currently exposed to the industrial contaminants in the outskirts of the densely populated Tel Aviv metropolis. Here we report the results of a large variety of analysis conducted on the 140m saturated profile that included field measurements (eg dissolved oxygen, pH, temperature, conductivity), major elements (eg Cl-, SO42-, HCO3-, NO3-, Ca2+, K+, Na+), trace elements (eg Pb, Fe, Cu) and radium isotopic measurements (223Ra, 224Ra, 226Ra). A clear distinction between the units becomes evident along the vertical profile; the upper phreatic unit (A) appears to be more saline relative to the central …

publication date

  • January 1, 2005