The determination and distribution of cobalt and nickel in tropical Pacific water
Date
1966
Authors
Contributor
Advisor
Department
Instructor
Depositor
Speaker
Researcher
Consultant
Interviewer
Narrator
Transcriber
Annotator
Journal Title
Journal ISSN
Volume Title
Publisher
University of Hawaii at Manoa
Volume
Number/Issue
Starting Page
Ending Page
Alternative Title
Abstract
In a study of the bio-geo-chemical circulation of cobalt and the related transition element, nickel, in Hawaiian waters, it was decided to employ the colorimetric methods described by Thompson and Laevastu for the determination of trace quantities of both elements. Both procedures, nitroso-R method for cobalt and the dimethylglyoxime procedure for nickel, were found to be extremely sensitive to slight modifications. The methods were studied in detail, modified and improved, which resulted in a five-fold increase in sensitivity and therefore a reduction in sample size from ten to two liters. An increase in precision in the measurement of the colored chelate resulted by careful control of the pH and time during complex formation, conditions for decomposition of excess reagent, and choice of wavelength. For optimum recovery it was necessary to allow a minimum period of seven days to elapse following precipitation with sodium carbonate prior to filtration and analysis. A previously unreported, but significant "salt effect" was detected which required construction of a calibration curve prepared from sea water, or a correction factor in use of standards in distilled water. Monthly samples of water were taken in 1964 from the Johnson Island area and Koko Head, Oahu, and analyzed for cobalt and nickel. The Johnson Island water also had important parameters determined i.e., chlorophylls, carbon14 productivity, nitrate, phosphate, as well as temperature and salinity. After analysis, the results were programmed and correlated with the IBM 7040. The resulting relationships were indicative of typical subtropical water in both the upper mixed layer as well as the subsurface water below the pycnocline. The cobalt and nickel data lend evidence to a "non-crustal" or volcanic contribution to the salinity of the oceans.
Description
Keywords
Cobalt, Nickel, Seawater--Analysis, Pacific Ocean
Citation
Extent
Format
Geographic Location
Time Period
Related To
Theses for the degree of Doctor of Philosophy (University of Hawaii (Honolulu)). Chemistry; no. 101
Related To (URI)
Table of Contents
Rights
All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Rights Holder
Local Contexts
Collections
Email libraryada-l@lists.hawaii.edu if you need this content in ADA-compliant format.