NDLI: Determinação de elementos químicos de solos e sedimentos em suspensão para monitoração da qualidade ambiental de manguezal de Pernambuco

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Determinação de elementos químicos de solos e sedimentos em suspensão para monitoração da qualidade ambiental de manguezal de Pernambuco

Content Provider	Semantic Scholar
Author	Lyra, Denilson Tenorio De
Copyright Year	2016
Abstract	Environmental contamination problems have increased with the industrialization and urban expansion due to uncontrolled release of industrial and domestic wastewater. As mangrove soils are formed by fluvial and marine sediments under constant tidal influence, this ecological compartment is of utmost relevance for the determination its chemical element composition. Otherwise, it is still not clear the contribution of suspended sediments due to its capability of transportation of a wide range of chemical substances for the development of these soils. For this reason, the objective of this work was to determine Al, Br, Ca, Cd, Cu, Fe, K, Mn, Mo, Ni, Pb, Sb, Si, Sr, Th, Ti, U and Zn by the combination of the analytical techniques Energy Dispersion X-Ray Fluorescence – EDXRF, Flame Atomic Absorption Spectrometry – FAAS and Inductively Coupled Plasma Mass Spectrometry – ICP-MS in the urban mangrove soils from Beberibe River, Pernambuco, Brasil. The chemical elements Al, Br, Ca, Fe, K, Mn, Ni, Pb, Si, Sr and Zn were also quantified by EDXRF in the Beberibe's suspended sediments from a local near the estuary. For soil, 30 samples were collected at the 0-20 cm depth in the mangrove. Considering the suspended sediments, eight composite water samples of 20 L were sampled along 105 minutes (15 minute each) in the Beberibe River during a rain event. Soil sample preparation involved drying, milling and homogenizing. After six months of spontaneously sedimentation, the suspended matter was extracted by means of suction and centrifugation, followed by freeze-drying and homogenizing to obtain suspended sediment samples. Analytical portions (0.5 g) of soil and suspended sediment samples and certified reference materials were transferred for polyethylene vials sealed with polypropylene film specifically developed for EDXRF analysis. Test portions (0.1 g) of soil samples, reference materials and analytical blanks were chemically treated for FAAS and ICP-MS analyses. According to the Number En values obtained through the analysis of the reference material SRM 2709 San Joaquin Soil, SRM 2711 Montana Soil and IAEA Soil 7, the analytical techniques were adequate for quantifying chemical elements in the soil and suspended sediment samples. The results showed a considerable variability for the terrigenous chemical elements Al, Fe, Si and Ti in the urban mangrove soils. The maximum concentrations of chemical elements of relevance for environmental impacts achieved 0.49 mg kg -1 for Cd, 48 mg kg -1 for Cu, 185 mg kg -1 for Mn, 14.5 mg kg -1 for Mo, 31 mg kg -1 for Ni, 71 mg kg -1 for Pb, 1.6 mg kg -1 for Sb and 192 mg kg -1 for Zn. In accordance with the Pernambuco State's legislation, the concentrations of Cu, Ni, Pb and Zn were above the normative values for soils. Although, considering the international recommendations for environmental quality assurance for aquatic ecosystems, only Zn surpassed the concentration range in which the possible adverse effects on the biota occasionally occur. For suspended sediments, different sources of chemical elements were realized for the studied area based on the Principal Component Analysis results. Besides, the chemical elements Al, Ti and Zn determined in the Beberibe River suspended sediments showed mass fractions higher than the world mean values, achieving 129.000 mg kg -1 , 6.600 mg kg -1 and 248 mg kg -1 , respectively. The results emphasized the needs of continuous monitoring of aquatic ecosystems mainly in urban environment.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://repositorio.ufpe.br/bitstream/123456789/25958/1/DISSERTA%C3%87%C3%83O%20Denilson%20Tenorio%20de%20Lyra.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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