Discrimination between sediment and soil samples for forensic purposes using elemental data: An investigation of particle size effects Kenneth Pye, Simon.

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Presentation transcript:

Discrimination between sediment and soil samples for forensic purposes using elemental data: An investigation of particle size effects Kenneth Pye, Simon J. Blott, Debra J. Croft, Samantha J. Witton Forensic Science International Volume 167, Issue 1, Pages 30-42 (March 2007) DOI: 10.1016/j.forsciint.2006.06.005 Copyright © 2006 Elsevier Ireland Ltd Terms and Conditions

Fig. 1 The study area and locations of sampling sites. Forensic Science International 2007 167, 30-42DOI: (10.1016/j.forsciint.2006.06.005) Copyright © 2006 Elsevier Ireland Ltd Terms and Conditions

Fig. 2 Graphical comparisons of particle size parameters: (a) mean, (b) median, (c) primary mode, (d) %sand, (e) %silt, (f) %clay, (g) % <150μm, (h) % 63–150μm, (i) % 20–63μm, and (j) % <20μm in 17 sediment samples from the River Avon, determined by laser granulometry. Forensic Science International 2007 167, 30-42DOI: (10.1016/j.forsciint.2006.06.005) Copyright © 2006 Elsevier Ireland Ltd Terms and Conditions

Fig. 3 Averages and standard deviations for (a) %SiO2, (b) %Fe2O3, (c) Ba, (d) Cu, (e) Ce and (f) U in the bulk sediments and four different size fractions of 17 sediment samples from the River Avon. Forensic Science International 2007 167, 30-42DOI: (10.1016/j.forsciint.2006.06.005) Copyright © 2006 Elsevier Ireland Ltd Terms and Conditions

Fig. 4 Bivariate plots of (a) Al2O3/Fe2O3 vs. Al2O3/K2O and (b) SiO2/Al2O3 vs. K2O/Na2O ratios for the bulk sediments and four different size fractions of 17 sediment samples from the River Avon. Forensic Science International 2007 167, 30-42DOI: (10.1016/j.forsciint.2006.06.005) Copyright © 2006 Elsevier Ireland Ltd Terms and Conditions

Fig. 5 Plots for the first and second principal components using data for all 49 elements determined by ICP-AES and ICP-MS: (a) bulk sediments, (b) <150μm fractions, (c) 63–150μm fractions, (d) 20–63μm fractions, (e) <20μm fractions and (f) bulk samples and all size fractions combined. Forensic Science International 2007 167, 30-42DOI: (10.1016/j.forsciint.2006.06.005) Copyright © 2006 Elsevier Ireland Ltd Terms and Conditions

Fig. 6 Agglomerative hierarchical cluster dendrograms calculated using Ward's method based on data for 49 elements determined by ICP-AES and ICP-MS: (a) bulk sediments, (b) <150μm fractions, (c) 63–150μm fractions, (d) 20–63μm fractions and (e) <20μm fractions. Forensic Science International 2007 167, 30-42DOI: (10.1016/j.forsciint.2006.06.005) Copyright © 2006 Elsevier Ireland Ltd Terms and Conditions

Fig. 7 Histograms showing along-river variation in values of the Al2O3/K2O ratio and SiO2/Al2O3 ratio: (a and f) bulk sediments; (b and g) <150μm fractions, (c and h) 63–150μm fractions, (d and i) 20–63μm fractions and (e and j) <20μm fractions. Forensic Science International 2007 167, 30-42DOI: (10.1016/j.forsciint.2006.06.005) Copyright © 2006 Elsevier Ireland Ltd Terms and Conditions