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Dissertation/Thesis Abstract

Analysis of Soil Elemental Concentrations Determined Using ICP-MS and Portable XRF in Metro-East Illinois
by Unufe, Eloho, M.S., Southern Illinois University at Edwardsville, 2020, 62; 28260120
Abstract (Summary)

Anthropogenic and naturally occurring activities have brought about the contamination of soil with heavy metals. As a result of this contamination, the soil is negatively impacted. Soil metal contamination by lead (Pb), arsenic (As) and cadmium (Cd) have been observed to have negative health effects on humans.

The analysis of soil samples has been carried out on conventional instruments like Atomic Absorption Spectrometry (AAS) and Inductively Coupled Mass Spectrometry (ICP-MS). Using these instruments, however, requires sample preparation that involves the destruction of the sample. The portable X-ray fluorescence spectrometer (P-XRF) provides a more economic and non-destructive method for determining the elemental composition of solid samples.

The objective of this work is to analyze soil samples from the Metro-East region of Illinois using a portable handheld XRF. The results are compared with results from ICP-MS, with the purpose of creating an element-based regression model, as a means of validating the analyzed P-XRF result. Standard reference materials (SRMs) were also used in tandem to validate element concentration analyzed by the P-XRF. Principal Component Analysis (PCA) was performed on the obtained elemental concentration to observe element concentration trends. The P-XRF can be used to routinely obtain quantitative concentrations of Ca, Cu, Fe, Mn, Ni, Pb, Rb, S, and Zn. These elements were identified using the P-XRF and quantitatively validated with the ICP-MS and SRMs. In addition to these findings, the PCA identified Ag, Cd, Cr, Cu, Pb, S, Sn, and Zn to be highly correlated and likely have a similar pollution source. Al, Ga, K, Li, Rb, Th, and Y were also observed to show a positive multivariate correlation indicating naturally occurring variations in the Metro-East region.

Indexing (document details)
Advisor: Greenfield, Ben, Martinez, Adriana
Commitee: Lin, Zhi-Qing, Adegboyega, Nathaniel
School: Southern Illinois University at Edwardsville
Department: Environmental Sciences
School Location: United States -- Illinois
Source: MAI 82/8(E), Masters Abstracts International
Source Type: DISSERTATION
Subjects: Environmental science, Statistics, Soil sciences, Materials science, Atomic physics, Environmental management
Keywords: ICP-MS, Portable XRF, Regression model, Soil elemental concentrations, Metro-East Illinois, Soil contamination with heavy metals
Publication Number: 28260120
ISBN: 9798569958085
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