Annual Report on Office of Naval Research Grant N00014-86-G-0147 (Moss Landing Marine Laboratories)
Abstract
We worked on the development of simple, rapid methods for the analysis of trace metals in seawater while onboard ship and continued to develop our capabilities for analyses of dissolved chemicals in situ. We have developed a method for the determination of manganese that is based on its catalysis of the oxidation of 7,7,8,8-tetracyanoquinodimethan. The chemiluminescence produced by this reaction allows us to detect manganese at concentrations down to 0.1 nM with no significant interferences in seawater. Each analysis requires only 6 minutes and is completely automated. We used this method to study manganese geochemistry in the coastal zone and in deep-sea hydrothermal vent plumes. Oxidation of brilliant sulfoflavine in the presence of iron(II) generates chemiluminescence, which can be used to determine iron concentrations to concentrations of at least 0.3 nM. Total iron concentrations can be obtained by adding ascorbic acid to samples, which results in the rapid reduction of IRON(III). This method was used to determine iron redox specification in hydrothermal vent plumes with great success on a cruise to the Juan de Fuca Ridge area. Partial contents: Continuous determination of nitrate concentrations in situ; and Hydrogen peroxide in the Western Mediterranean Sea -- A tracer for vertical advection. (edc)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 14, 1989
- Accession Number
- ADA216573
Entities
People
- Edward J. Green