Accession Number:

ADA470732

Title:

Comparison of Key West and Persian Gulf Seawaters

Descriptive Note:

Conference paper

Corporate Author:

NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV

Report Date:

2007-07-18

Pagination or Media Count:

16.0

Abstract:

The experiments described in this paper demonstrate changes in the chemistries and microflora of two natural coastal seawaters collected from Key West, Florida, and the Persian Gulf as a result of storage and environmental conditions. Exposure to an anaerobic atmosphere containing a mixed gas of nitrogen, carbon dioxide, and hydrogen generated the highest microflora concentration, especially sulfate-reducing bacteria SRB. Biotic dissolved sulfide levels were also highest in the mixed gas atmosphere. In contrast, sulfides were not detected in seawater maintained anaerobic with bubbled nitrogen. Separate introductions of carbon steel and agitation also affected chemistries and microflora. Key West seawater consistently had equal or greater bacterial numbers in all conditions when compared with Persian Gulf seawater. Bubbling nitrogen into natural seawater to achieve an anaerobic condition is not conducive to the growth of SRB and the resulting biotic sulfide. Laboratory experiments that mimic anaerobic conditions by bubbling nitrogen may not produce conditions found in the field due to pH changes. Therefore, removal of oxygen is not the only consideration when attempting to reproduce anaerobic conditions. A followup paper is planned to address the influences of chemistry and microflora on corrosivity.

Subject Categories:

  • Microbiology
  • Physical Chemistry
  • Physical and Dynamic Oceanography
  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE