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| 1 | Advances in Tropical Soil Characterization via Portable X-Ray Fluorescence Spectrometry显示文摘Portable X-ray fluorescence(pXRF) spectrometers can be used to determine the elemental composition easily, rapidly, and without using chemical reagents, which is very important for tropical regions due to the lack of detailed soil characterization data. Moreover,pXRF data can be used to predict the results of more expensive, time-consuming, and conventional laboratory analyses. This study sought to determine the elemental composition of various soil profiles using pXRF. Two operational modes(Trace Mode and General Mode) and two scanning time(30 and 60 s) were assessed to determine their effects on the correlation of pXRF dataset with respect to conventional inductively coupled plasma(ICP)-optical emission spectrometry analysis. This relationship has been reported in previous studies, however, few studies were performed on tropical soils, which are unique. Furthermore, such relationships establish the viability of developing prediction models directly from pXRF data. Linear regression was applied to develop calibration models for the prediction of ICP analysis results and exchangeable and available elemental contents based on pXRF data. High coefficients of determination(R^2) were obtained for Ca(0.87), Cu(0.90), Fe(0.95), Mn(0.85), Cr(0.95), V(0.72), and Ni(0.90), with adequate validation. Statistically significant results were not found for Al, K, Zn, Ti, and Zr. The models predicting the exchangeable Ca based on the total Ca from p XRF reached an R^2 of up to 0.85. Operational modes influenced the pXRF results. Our results illustrate that pXRF holds great promise for tropical soil characterization and the development of prediction models, justifying the need for larger-scale studies in tropical countries worldwide. | Elen A. SILVA David C. WEINDORF Sergio H. G. SILVA Bruno T. RIBEIRO Giovana C. POGGERE Teotonio S. CARVALHO Mariana G. M. GONQALVES Luiz R. G. GUILHERME Nilton CURI | 2019 | Pedosphere2019，29，4： | 5 |
| 2 | Posterior reversible encephalopathy syndrome: the importance of early diagnosis显示文摘 | Teotonio R Marmoto D Januario C | 2012 | BMJ Case Rep2012，00，： | 1 |
| 3 | Photolumineseence Behavior of the Sm3 + and Tb3 + ions Doped into the Gd2 ( WO4 ) 3 Matrix Prepared by the Pechini and Ceramic Methods 显示文摘 | Kodaira C A Brito H F Teotonio E E S | 2004 | Journal of the Brazilian Chemical Society2004，15，6： | 1 |
| 4 | Synthesis,crystalline structure and photoluminescence investigations of the new trivalent rare earth complexes显示文摘 | TEOTONIO E E S FELINTO M C F C BRITO H F | 2004 | Inorg Chim Acta2004，357，： | 1 |
| 5 | Synthesis,crystalline structure and photoluminescence investigations of the new trivalent rare earth complexes(Sm3+,Eu3+ and Tb3+)containing 2-thiophenecarboxylate as sensitizer显示文摘 | TEOTONIO E E S FELINTO M C F C BRITO H F | 2004 | Inorganica Chimica Acta2004，357，2： | 1 |
| 6 | Perspective: reverse evolution显示文摘 | Teotonio H Rose MR | 2001 | Evolution2001，55，4： | 1 |
| 7 | Photoluminescent behavior of SrB4O7 : RE^2+ (RE= Sm and Eu) prepared by Pechini,combustion and ceramic methods 显示文摘 | Stefania R Maia A D Teotonio E E S | 2006 | Journal of Solid State Chemistry2006，179，4： | 1 |
| 8 | Optical properties of red,green and blue emitting rare earth benzenetricarboxylate compounds显示文摘 | Souza E R Silva I G N Teotonio E E S Felinto M C F Brito H F | | 0，，： | 1 |
| 9 | Photoluminescent behavior of SrB 4 O 7 : RE 2+ ( RE =Sm and Eu) prepared by Pechini, combustion and ceramic methods显示文摘 | R. Stefani A.D. Maia E.E.S. Teotonio M.A.F. Monteiro M.C.F.C. Felinto H.F. Brito | 2006 | Journal of Solid State Chemistry2006，，4： | 1 |
| 10 | Synthesis,crystaUine structure and photoluminescence investigations of the new trivalent rare earth complexes (Sin^3+, Eu^3+ and Tb^3+ ) containing 2-thiophenecarboxylate as sensltizer显示文摘 | TEOTONIO E E S FELINTO M C F C BRITO H F | 2004 | Inorganlca Chimica Acta2004，357，： | 1 |
| 11 | Voltage color table OLED with(Sm,Eu)-diketonate complex blend显示文摘 | R Reyes M Cremona E E S Teotonio | 2004 | Chem Phys Lett2004，396，： | 1 |
| 12 | Op- tical properties of red, green and blue emitting rare earth benzenetricarboxylate compounds 显示文摘 | Rezende Souza E Silva I G N Teotonio E E S | 2010 | Journal of Lumi- nescence2010，130，2： | 1 |
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