The platinum group metals in iron meteorites : thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Chemistry, Department of Chemistry and Biochemistry, Massey University, Palmerston North, New Zealand

Simple item page
dc.contributor.authorHoashi, Maki
dc.date.accessioned2011-10-26T03:34:56Z
dc.date.available2011-10-26T03:34:56Z
dc.date.issued1990
dc.description.abstractSolvent extraction methods have been developed for the determination of Ru, Pd and Pt in iron meteorites. The method for Ru is based on the oxidation of this element in HCl solutions with sodium periodate followed by extraction of the tetroxide into CHCl3. The CHCl3 phase is then removed to a HNO3-NaIO4 "keeper" solution for storage up to 17 hours prior to analysis. The method for Pd and Pt entails simultaneous extraction of their stable iodocomplexes into methylisobutyl ketone after removal of Fe(III) as the chlorocomplex. The digestion of the samples with reference to these elements has also been investigated. All three elements were determined by the graphite furnace atomic absorption spectrometry technique. The limit of detection was lowered by increasing the volume of organic phase placed in the graphite furnace. The lowest absolute detection limits achieved in this study were 0.5 ng for Ru, 0.5 ng for Pd and 5 ng for Pt. The platinum group metal values for 108 authentic iron meteorites were subjected to Principal Components Analysis and Discriminant Analysis. These procedures confirmed the validity of the classification of iron meteorites developed over the past 25 years, but highlighted poor fits for some individual iron meteorites within a group. Possible reclassification of these members was evaluated after consideration of the meteorite's morphological features. The cases for the merging of some groups were investigated and discussed with reference to the chemical features of those groups. The data obtained also revealed several cases of meteorite pairings (related members of a single meteorite shower catalogued as separate meteorites), instances of the mislabelling of museum fragments and two putative meteorites which proved to consist of man-made materials.en_US
dc.identifier.urihttp://hdl.handle.net/10179/2801
dc.language.isoenen_US
dc.publisherMassey Universityen_US
dc.rightsThe Authoren_US
dc.subjectPlatinum group metalsen_US
dc.subjectIron meteoritesen_US
dc.titleThe platinum group metals in iron meteorites : thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Chemistry, Department of Chemistry and Biochemistry, Massey University, Palmerston North, New Zealanden_US
dc.typeThesisen_US
massey.contributor.authorHoashi, Maki
thesis.degree.disciplineChemistry
thesis.degree.grantorMassey University
thesis.degree.levelDoctoral
thesis.degree.levelDoctoralen
thesis.degree.nameDoctor of Philosophy (Ph.D.)
Files
Original bundle
Now showing 1 - 2 of 2
Thumbnail Image
Name:
02_whole.pdf
Size:
6.67 MB
Format:
Adobe Portable Document Format
Description:
Download
Thumbnail Image
Name:
01_front.pdf
Size:
633 KB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
804 B
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Theses and Dissertations