Application of chemometric methods in the evaluation of chemical and spectroscopic data on organic matter from Oxisols in sewage sludge applications

Autor(es)

dos Santos, Larissa Macedo ^{[1, 2]} ; Simoes, Marcelo Luiz ^[2] ; de Melo, Wanderley Jose ^[3] ; Martin-Neto, Ladislau ^[2] ; Pereira-Filho, Edenir Rodrigues ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[2] Embrapa Instrumentacao Agropecuaria, BR-13560970 Sao Carlos, SP - Brazil

^[3] Univ Estadual Paulista, Dept Tecnol, BR-14884900 Jaboticabal, SP - Brazil

^[4] Univ Fed Sao Carlos, Dept Quim, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Geoderma; v. 155, n. 1-2, p. 121-127, FEB 15 2010.
• Citações Web of Science: 41

Resumo

Chemometric methods can contribute to soil research by permitting the extraction of more information from the data. The aim of this work was to use Principal Component Analysis to evaluate data obtained through chemical and spectroscopic methods on the changes in the humification process of soil organic matter from two tropical soils after sewage sludge application. In this case, humic acids extracted from Typic Eutrorthox and Typic Haplorthox soils with and without sewage sludge application for 7 consecutive years were studied. The results obtained for all of the samples and methods showed two clusters: samples extracted from the two soil types. These expected results indicated the textural difference between the two soils was more significant than the differences between treatments (control and sewage sludge application) or between depths. In this case, an individual chemometric treatment was made for each type of soil. It was noted that the characterization of the humic acids extracted from soils with and without sewage sludge application after 7 consecutive years using several methods supplies important results about changes in the humification degree of soil organic matter, These important result obtained by Principal Component Analysis justify further research using these methods to characterize the changes in the humic acids extracted from sewage sludge-amended soils. (C) 2009 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 99/09133-4 - Estudos espectroscópicos da complexação de íons metálicos com a matéria orgânica e constituintes húmicos de solos sob diferentes manejos
• Beneficiário: Martha González Pérez
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 98/14270-8 - Centro de Ciências Ópticas e Fotônica
• Beneficiário: Vanderlei Salvador Bagnato
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs