Show simple item record

dc.contributor.advisorDerek W. Spencer and David N. Hume.en_US
dc.contributor.authorFitzgerald, William Francis, 1926-en_US
dc.contributor.otherWoods Hole Oceanographic Institution.en_US
dc.date.accessioned2010-10-05T14:24:48Z
dc.date.available2010-10-05T14:24:48Z
dc.date.issued1970en_US
dc.identifier.urihttp://hdl.handle.net/1721.1/58857
dc.descriptionThesis (Ph. D.)--Joint Program in Oceanography (Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences; and the Woods Hole Oceanographic Institution), February 1970.en_US
dc.description"January 1970."en_US
dc.descriptionIncludes bibliographical references (p. 173-177).en_US
dc.description.abstractAnodic stripping voltammetry utilizing a thin film mercury composite graphite electrode has been evaluated and applied for the direct analysis of the metals, Zn,J Cu, Pb, and Cd in sea water. The electrode was observed to follow theoretical behavior for thin film electrodes and the technique was found not to be adversely affected by dissolved organic material in sea water. Good precision (ca., 5%) was obtained in both coastal and open ocean waters at the in situ concentrations of Zn, Cu, Pb, and Cd. It was shown that this method is at present most suitable for measurements of Cu, Pb, and Cd in sea water. Evidence is given suggesting that Ni may interfere with the determination of Zn through formation of an intermetallic compound, and further studies are indicated to understand this phenomenon. The anodic stripping apparatus was adapted and used conveniently on shipboard. It was demonstrated that stripping analysis could be combined with a method for the destruction of dissolved organic matter- (photo-oxidation with ultra-violet radiation), and with an acidification procedure to obtain measurements of trace metal speciation in sea water.en_US
dc.description.abstract(cont.) An argument for the existence of Cu-aspartic acid chelates in sea water has been described theoretically and demonstrated empirically; suggesting that a significant fraction of Cu and other trace metals may be expected to be organically sequestered in sea water. A study of coastal waters employing the total method (anodic stripping-photo-oxidation-acidification) indicated the presence of a significant group of organic ligands that complex Cu (ca., 60%). It was also shown that the waters subject to gross pollution contain about 30% of the total Cu in very stable organic complexes that release Cu only when the dissolved organic matter is destroyed, and not when the pH of this sea water is adjusted to 3. An open ocean trace metal study of a thermal-front zone in the western Sargasso Sea gave data for Cu, Zn, Pb, and Cd that compared favorably with other relevant investigations. Higher free metal concentrations were observed south of the front than to the north, providing further evidence that these fronts may mark a change between southern and northern conditions in the Sargasso Sea. Data obtained from shipboard analyses using the total analytical method indicates the presence of weak organic complexes with Cu and Pb in open ocean waters.en_US
dc.description.statementofresponsibilityby William F. Fitzgerald.en_US
dc.format.extent180 p.en_US
dc.language.isoengen_US
dc.publisherMassachusetts Institute of Technologyen_US
dc.rightsM.I.T. 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. See provided URL for inquiries about permission.en_US
dc.rights.urihttp://dspace.mit.edu/handle/1721.1/7582en_US
dc.subjectJoint Program in Oceanography.en_US
dc.subjectEarth and Planetary Sciences.en_US
dc.subjectWoods Hole Oceanographic Institution.en_US
dc.subject.lcshSeawateren_US
dc.subject.lcshVoltammetryen_US
dc.titleA study of certain trace metals in sea water using anodic stripping voltammetryen_US
dc.typeThesisen_US
dc.description.degreePh.D.en_US
dc.contributor.departmentJoint Program in Oceanography.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Dept. of Earth and Planetary Sciences.en_US
dc.contributor.departmentWoods Hole Oceanographic Institution.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
dc.identifier.oclc22375198en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record