Application of multivariate chemometrics in forensic soil discrimination based on the UV-Vis spectrum of the acid fraction of humus
Φόρτωση...
Ημερομηνία
Συγγραφείς
Thanasoulias, N. C.
Piliouris, E. T.
Kotti, M. S. E.
Evmiridis, N. P.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Forensic Sci Int
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
Forty-four soil samples from five different areas were examined on the basis of the UV-Vis spectrum of the acid fraction of humus with a view to achieving good discrimination between them. Fulvic and humic acids were extracted from the samples into an alkaline aqueous solution and absorbance values, after appropriate transformations, were subjected to a K-mean cluster analysis (CA) over the objects (samples) for an initial feature reduction (20 variables retained). This was followed by principal component analysis (PCA) for the removal of outliers (four samples removed). The same statistical technique was used on the remaining samples to decide how many variables to enter into the linear discriminant function analysis (DA) and whether original variables or component scores should be used. It was found that the scree test was a good criterion for deciding on the number of components to extract (nine components extracted) and that the use of component scores instead of original variables led to a lower average redundancy (20.6%) of the variables in the discriminant model. From the components entered into the model and their loadings, it was concluded that the discrimination achieved was due to the relative concentration of aromatic groups and other fragments in the samples as well as the degree of soil humification. An overall 85% correct classification of the training dataset was observed (Wilks' lambda = 0.0420) and the method was judged satisfactory for supporting exclusionary forensic purposes. (C) 2002 Elsevier Science Ireland Ltd. All rights reserved.
Περιγραφή
Λέξεις-κλειδιά
forensic chemistry, soil evidence, multivariate chemometrics, uv-vis spectrophotometry, acid fraction of humus, humic acids, validity
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000179799600001
http://ac.els-cdn.com/S0379073802003699/1-s2.0-S0379073802003699-main.pdf?_tid=0198850d69d5e28fe9e474ea4ddff9f6&acdnat=1335373536_9f3c9061616afdec74001c7bb800cadb
http://ac.els-cdn.com/S0379073802003699/1-s2.0-S0379073802003699-main.pdf?_tid=0198850d69d5e28fe9e474ea4ddff9f6&acdnat=1335373536_9f3c9061616afdec74001c7bb800cadb
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας