Hydrobiologia

, Volume 197, Issue 1, pp 83–89 | Cite as

Nutrients in pore waters from Dead Sea sediments

  • Arie Nissenbaum
  • Mariana Stiller
  • Aminadav Nishri
Article

Abstract

Pore waters were separated from 50 cm-long cores of Dead Sea sediments raised from waters depths of 25, 30 and 318 m. The salinity of the pore water is close to that of the overlying water at 225–230 g l−1 chloride. The titration alkalinity of the pore water is about 60 % of the overlying water, and sulfate is also depleted. Ammonia and phosphate concentrations are higher than those of the water column with up to 50 mg l−1 N-NH3 (ten times increase) and 350 µg l−1 P-POinf4sup3−(four to eight times increase). Early diagenetic reactions are a result of decomposition of organic matter and of water-sediment interactions, resulting in aragonite precipitation, phosphate removal to the sediments, probably by absorption on iron-oxyhydroxides followed by remobilization, reduction of sulfate and formation of iron sulfides and accumulation of ammonia. Mass balance calculations show that pore water contribute about 80% of the ammonia and 30% of the phosphate input into the Dead Sea water column. On the other hand, the sediments act as a sink for carbonate and sulfate.

Key words

Dead Sea pore waters early diagenesis Ammonia phosphate carbonate nutrients 

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Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • Arie Nissenbaum
    • 1
  • Mariana Stiller
    • 1
  • Aminadav Nishri
    • 2
  1. 1.Isotope Research DepartmentWeizmann Institute of ScienceRehovotIsrael
  2. 2.Allon Kinneret LaboratoryIsrael Oceanographic and Limnological Research OrganizationTabkhaIsrael

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