Fernández Zahily Herrero, Dos Santos Júnior José Araújo, Dos Santos Amaral Romilton, Alvarez Juan Reinaldo Estevez, da Silva Edvane Borges, De França Elvis Joacir, Menezes Rômulo Simões Cezar, de Farias Emerson Emiliano Gualberto, do Nascimento Santos Josineide Marques
Departamento de Energia Nuclear (UFPE/DEN), Universidade Federal de Pernambuco, Av. Professor Luiz Freire, 1000, Cidade Universitária, Recife, 50740-545, Brazil.
Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), 30 Street, 502, Playa, 6122, Havana, Cuba.
Environ Monit Assess. 2017 Aug 10;189(9):447. doi: 10.1007/s10661-017-6162-5.
The quality assessment of tropical soils and sediments is still under discussion, with efforts being made on the part of governmental agencies to establish reference values. Energy dispersive X-ray fluorescence (EDXRF) is a potential analytical technique for quantifying diverse chemical elements in geological material without chemical treatment, primarily when it is performed at an appropriate metrological level. In this work, analytical curves were obtained by means of the analysis of geological reference materials (RMs), which allowed for the researchers to draw a comparison among the sources of analytical uncertainty. After having determined the quality assurance of the analytical procedure, the EDXRF method was applied to determine chemical elements in soils from the state of Pernambuco, Brazil. The regression coefficients of the analytical curves used to determine Al, Ca, Fe, K, Mg, Mn, Ni, Pb, Si, Sr, Ti, and Zn were higher than 0.99. The quality of the analytical procedure was demonstrated at a 95% confidence level, in which the estimated analytical uncertainties agreed with those from the RM's certificates of analysis. The analysis of diverse geological samples from Pernambuco indicated higher concentrations of Ni and Zn in sugarcane, with maximum values of 41 mg kg and 118 mg kg, respectively, and agricultural areas (41 mg kg and 127 mg kg, respectively). The trace element Sr was mainly enriched in urban soils with values of 400 mg kg. According to the results, the EDXRF method was successfully implemented, providing some chemical tracers for the quality assessment of tropical soils and sediments.
热带土壤和沉积物的质量评估仍在讨论中，政府机构正在努力建立参考值。能量色散X射线荧光光谱法（EDXRF）是一种潜在的分析技术，可在不进行化学处理的情况下对地质材料中的多种化学元素进行定量分析，尤其是在适当的计量水平下进行分析时。在这项工作中，通过对地质参考物质（RMs）的分析获得了分析曲线，这使研究人员能够对分析不确定度的来源进行比较。在确定了分析程序的质量保证后，应用EDXRF方法测定了巴西伯南布哥州土壤中的化学元素。用于测定铝、钙、铁、钾、镁、锰、镍、铅、硅、锶、钛和锌的分析曲线的回归系数高于0.99。在95%的置信水平下证明了分析程序的质量，其中估计的分析不确定度与参考物质分析证书中的不确定度一致。对伯南布哥州不同地质样品的分析表明，甘蔗中镍和锌的浓度较高，最大值分别为41毫克/千克和118毫克/千克，农业地区（分别为41毫克/千克和127毫克/千克）。微量元素锶主要富集在城市土壤中，含量为400毫克/千克。根据结果，成功实施了EDXRF方法，为热带土壤和沉积物的质量评估提供了一些化学示踪剂。
