عنوان

Application of x-ray emission spectrometry to some environmental problems in Africa

Number

TLpq304088134

.Language of Text, Soundtrack etc

انگلیسی

Title Proper

Application of x-ray emission spectrometry to some environmental problems in Africa

General Material Designation

[Thesis]

First Statement of Responsibility

M. A. H. Eltayeb

Subsequent Statement of Responsibility

R. V. Grieken

Name of Publisher, Distributor, etc.

Universitaire Instelling Antwerpen (Belgium)

Date of Publication, Distribution, etc.

1993

Specific Material Designation and Extent of Item

172

Dissertation or thesis details and type of degree

Ph.D.

Body granting the degree

Universitaire Instelling Antwerpen (Belgium)

Text preceding or following the note

1993

Text of Note

In this work we studied trace element concentrations in four types of environmental samples. In the first part two types of applications of hair trace element analysis were studied: hair as a monitor for environmental exposure to heavy elements and age-related variations in hair trace element content. Analysis of hair from a population group which is thought to stand high risk of contamination by lead from the work environment and to a control group which comprised university students of similar age as the members of the first group was performed. All the members of the exposed group could be differentiated by the high hair lead content. To elucidate the effect of age on hair trace element content, three groups of different age were studied. The first group showed a significantly higher hair trace element content as compared to the other two groups. In the second part we implemented two types of emission techniques, EDXRF and PIXE, for the analysis of aerosol samples collected at Khartoum, Sudan. High concentrations for the crustal elements were observed in Khartoum aerosol, and relatively low concentrations for the elements which result from anthropogenic activities. Single particle analysis for the samples collected on Nuclepore showed that most of the particles were soil dust particles. In the third study, we examined the relationship between mineral aerosol and the soil from which the aerosol is generated and the utility of the currently used reference materials and reference elements for enrichment factors calculation. In this study, the elemental concentration and enrichment factors calculated relative to a specific reference material or reference element showed remarkable similarity in both Sahara and Namib soil and mineral aerosol. In the two types of soils, all the elements, except Si, showed positive fractionation with decrease in the particle size. The concentration for the elements Al, Si, K, Rb and Sr increased slightly with decrease in the particle size, while the concentration for the elements Ti, Mn, Fe, Y and Zr increased by more than a factor of two when the particle size decreased. In the last part of this study, we developed, optimized and applied a preconcentration technique for the elemental analysis of environmental waters by EDXRF. In this study preconcentration of trace elements in environmental waters on Al(OH)3 carrier was studied. (Abstract shortened by UMI.)

Analytical chemistry

Atmosphere

heavy metals

lead contamination

Pure sciences

M. A. H. Eltayeb

R. V. Grieken

Electronic name

p

[Thesis]

276903

a

Y