Natural waters
Microwave-assisted photochemical digestion of natural waters: application in partition and speciation studies of copper.
... to accomplish a reduction of almost 100% in the emission and 6 min to reduce the concentration of dissolved organic carbon by 95%. The copper recovery from synthetic samples containing commercial humic acid, from soil ...
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DEVELOPMENT OF SAMPLING FOR QUANTIFICATION OF GLYPHOSATE IN NATURAL WATERS
... From the values of glyphosate recovered in the samples of water from an artesian well and the fortified samples from a stream, it was found that the resin and the eluent used for purification were effective. The method ...
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Analytical Strategies for Determination and Environmental Impact Assessment of Inorganic Antimony Species in Natural Waters Using Hydride Generation Atomic Fluorescence Spectrometry (HG AFS)
... and natural surface water, using continuous flow of hydride generation and atomic fluorescence ...in natural waters collected in Salvador, Bahia, Brazil, were evaluated and discussed, taking into ...
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Low cost methods to purify low grade reagents and to control contamination for trace metal determination in natural waters.
... in natural waters is to avoid contamination during sampling, manipulation and ...in natural waters in a common ...in natural waters even when total dissolved copper concentration ...
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Rapid accretion of dissolved organic carbon in the Springs of Florida: the most organic-poor natural waters
... in excess of 1000 µmol C L −1 (Kortelainen, 1993; Enache and Prairie, 2002). The high DOC concentration in most natural waters is a rather stable property. In fact, DOC con- centrations in most aquatic ...
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Cyanobacteria blooms in natural waters in Southern Portugal: a water management perspective
... in natural waters in order to minimize potential health risks to animal and human populations resulting from exposure through drinking water and recreational ...
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Rapid accretion of dissolved organic carbon in the springs of Florida: the most organic-poor natural waters
... clearest natural waters (Duarte and Can- field 1990b), thereby suggesting that DOC, which is a major source of light absorption in the UV and blue wavelengths (Kirk, 1983), occurs at very low ...
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Multicommutation and binary sampling in chemical flow analysis: spectrophotometric determination of phosphate in natural waters.
... MULTICOMMUTATION AND BINARY SAMPLING IN CHEMICAL FLOW ANALYSIS. SPEC- TROPHOTOMETRIC DETERMINATION OF PHOSPHATE IN NATURAL WATERS. A flow system based on multicommutation and binary sampling process was ...
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An in-line clean system for the solid-phase extraction of emerging contaminants in natural waters.
... AN IN-LINE CLEAN SYSTEM FOR THE SOLID-PHASE EXTRACTION OF EMERGING CONTAMINANTS IN NATURAL WATERS. A solid-phase in-line extraction system for water samples containing low levels of emerging contaminants is ...
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Natural Waters 1n Amazoriia
... The principie source of soluble calcium in cycling water of a Riverine forest, a Carrasco forest and 3 terra firme Rain forest communities was the forest vegetation[r] ...
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Accessing Planktothrix species diversity and associated toxins using quantitative real-time PCR in natural waters
... The most common cyanotoxins in Portuguese freshwaters are microcystins and their occurrence has been mainly attributed to cyanobacteria from the Microcystis genus. However, most recently, it has been described the ...
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Quantification of the pesticide dichlorvos by square wave voltammetry in pure and natural waters.
... As soluções padrão do pesticida foram preparadas com água ultra-pura, assim como com amostras de águas naturais coletadas nos Córregos do Monjolinho e do Gregório, da cidade de São Carlo[r] ...
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MODIFIED DGT DEVICES USING ALTERNATIVE MATERIALS FOR THE SPECIATION OF TRACE ELEMENTS IN NATURAL WATERS.
... O estudo de especiação das espécies metálicas Zn, Cu, Cr, Mn, Cd, Pb, Ni, foi conduzido em laboratório com a imersão por 24 h de três dispositivos DGT modificados (fase de ligação proposta e AGE como fase difusiva) e ...
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Determination of strontium isotopic composition in natural waters: examples of application in subsurface waters of the coastal zone of Bragantina region, Pará.
... A determinação das razões isotópicas 87 Sr/ 86 Sr e das concen- trações de Sr nas amostras de águas subsuperficiais coletadas na região Bragantina mostram que a utilização de resina esp[r] ...
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Voltammetric determination of glyphosate in natural waters with a copper electrode.
... Procurou-se, então, avaliar o uso do eletrodo de Cu na determinação direta do glifosato em amostras de águas superficiais, sem a necessidade de reações prévias, e aqui são descritos os e[r] ...
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J. Braz. Chem. Soc. vol.10 número1
... This paper presents the development of a methodology for the simultaneous analysis of pentachlorophenol and hexachlorobenzene in natural waters affected by industrial residues, as its principal goal. ...
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J. Braz. Chem. Soc. vol.12 número1
... in natural waters by hydride generation – atomic absorption spectrometry, using sodium tetrahydroborate(III) as reductant but in different reduction ...
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Are the defined substrate-based methods adequate to determine the microbiological quality of natural recreational waters?
... Water is one of the most important sources of infectious microorganism transmission to humans, via ingestion, contact with contaminated water, aerosol or by consump- tion of contaminated shellfish (Amaral et al. 2003; ...
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Braz. J. Chem. Eng. vol.32 número2
... of coagulation (Figure 2). Additionally, the higher coagulant dose applied in these conditions also leads to the formation of other species that, in turn, are able to develop positive charges on the surface of the ...
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