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dc.creatorSilva, Sérgio Henrique Godinho-
dc.creatorSilva, Elen Alvarenga-
dc.creatorPoggere, Giovana Clarice-
dc.creatorPádua Junior, Alceu Linares-
dc.creatorGonçalves, Mariana Gabriele Marcolino-
dc.creatorGuilherme, Luiz Roberto Guimarães-
dc.creatorCuri, Nilton-
dc.identifier.citationSILVA, S. H. G. et al. Modeling and prediction of sulfuric acid digestion analyses data from PXRF spectrometry in tropical soils. Scientia Agricola, Piracicaba, v. 77, n. 4, e20180132, 2020. DOI:
dc.description.abstractSulfuric acid digestion analyses (SAD) provide useful information to environmental studies, in terms of the geochemical balance of nutrients, parent material uniformity, nutrient reserves for perennial crops, and mineralogical composition of the soil clay fraction. Yet, these analyses are costly, time consuming, and generate chemical waste. This work aimed at predicting SAD results from portable X-ray fluorescence (pXRF) spectrometry, which is proposed as a “green chemistry” alternative to the current SAD method. Soil samples developed from different parent materials were analyzed for soil texture and SAD, and scanned with pXRF. The SAD results were predicted from pXRF elemental analyses through simple linear regressions, stepwise multiple linear regressions, and random forest algorithm, with and without incorporation of soil texture data. The modeling was developed with 70 % of the data, while the remaining 30 % was used for validation through calculation of R2, adjusted R2, root mean square error, and mean error. Simple linear regression can accurately predict SAD results of Fe2O3 (R2 0.89), TiO2 (R2 0.96), and P2O5 (R2 0.89). Stepwise regressions provided accurate predictions for Al2O3 (R2 0.87) and Ki - molar weathering index (SiO2/Al2O3) (R2 0.74) by incorporating soil texture data, as well as for SiO2 (R2 0.61). Random forest also provided adequate predictions, especially for Fe2O3 (R2 0.95), and improved results of Kr - molar weathering index (SiO2/(Al2O3 + Fe2O3)) (R2 0.66), by incorporation of soil texture data. Our findings showed that the SAD results could be accurately predicted from pXRF data, decreasing costs, time and the production of laboratory waste.pt_BR
dc.publisherEscola Superior de Agricultura "Luiz de Queiroz"pt_BR
dc.rightsAttribution 4.0 International*
dc.rightsacesso abertopt_BR
dc.sourceScientia Agricolapt_BR
dc.subjectSoil clay fractionpt_BR
dc.subjectWeathering indicespt_BR
dc.subjectRandom forestpt_BR
dc.subjectProximal sensorspt_BR
dc.subjectGreen chemistrypt_BR
dc.subjectFração de argila do solopt_BR
dc.subjectÍndices de intemperismopt_BR
dc.subjectFloresta aleatóriapt_BR
dc.subjectSensores proximaispt_BR
dc.subjectQuímica verdept_BR
dc.titleModeling and prediction of sulfuric acid digestion analyses data from PXRF spectrometry in tropical soilspt_BR
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