Determinação de Cd, Cu, Ni, Pb e Zn em águas marinhas oriundas da Bacia Potiguar utilizando a técnica de difusão em filmes finos por gradiente de concentração (DGT)

The DGT technique has been used to determine and better understand the dynamics and bioavailability of metals in the sea near to marine outfalls. In this work, the DGT was assessed for the determination of Cd, Pb, Cu, Zn and Ni in marine water samples from Potiguar Basin in its conventional aspect (binding agent, Chelex-100 and diffusive agent: Diffusive polyacrylamide gel (D) and restrictive (R)) and determination of Pb and Cd through its alternative aspect (binding agent: Saccharomyces cerevisiae immobilized in agarose gels and diffusive agent: 3MM Chromatography Paper). The deployment curves for long periods of immersion in the sample, showed a good linear correlation for the conventional aspect to Zn (D: R²=0.9586, R: R²=0.9444), Ni (D: R²=0.9789, R: R²=0.9286) and Cu (D: R²=0.764, R: R²=0.8143), and alternative to Pb (R²=0.9228) and Cd (R²=0.9673). The results of the organic and inorganic composition analysis in conventional aspect, showed that for every element there is no significant fraction of organic compounds in the sample. In addition, considering the alternative aspect, the comparison of obtained and expected masses suggests that some of the Pb is not labile and that the main retention mechanism of Pb for S. Cerevisiae occurs through ion exchange

Effect of chloride concentration on the electrochemical treatment of a synthetic tannery wastewater

The electrochemical treatment of a synthetic tannery wastewater prepared with 30 compounds used in animal skin processing was studied. Electrolyses were performed in a one-compartment flow cell at a current density of 20 mA cm(-2), using a dimensionally stable anode (DSA (R)) of composition Ti/Ir(0.10)Sn(0.90)O(2) as the working electrode. Effects of chloride concentration and presence of sulfate were evaluated. Variation in the concentration of phenolic compounds as a function of electrolysis time revealed a first-order exponential decay; faster phenol removals were obtained with increasing chloride concentration in the wastewater. Lower phenol removals were obtained in the presence of sulfate. Higher chloride concentrations led to a faster decrease in total organic carbon (TOC), chemical oxygen demand (COD), and absorbance values at 228 nm. Faster wastewater color removal, higher current efficiency and lower energy consumption were also obtained. This electrochemical treatment was also able to reduce the wastewater toxicity for Daphnia similis. (C) 2008 Elsevier Ltd. All rights reserved.

[The World] : Ant. Lafreri exc. - [Yleiskuva - Overview]

Roma : Antonio Lafreri 1572

Torneå

Helsingfors : A.W. Gröndahl & A.C. Öhman 1845 : Dresden, Adler u. Dietze

Konserttiohjelma 1892-04-28 - Program

Helsingfors 1892

Ny-Carleby

Helsingfors : A.W. Gröndahl & A.C. Öhman 1845 : Dresden, Adler u. Dietze

Avasaksa och Öfver-Torneå kyrka

Helsingfors : A.W. Gröndahl & A.C. Öhman 1845 : Dresden, Adler u. Dietze

Suomalainen kielioppi - [Nimiösivu]

Turku : G.E. Eurén 1852, J.W. Lillja & Co.

A.E. Nordenskiöld

Wiipuri 1881

Nådendal

Helsingfors : A.W. Gröndahl & A.C. Öhman 1845 : Dresden, Adler u. Dietze

Walamo

Helsingfors : A.W. Gröndahl & A.C. Öhman 1845 : Dresden, Adler u. Dietze

Turholm

Helsingfors : A.W. Gröndahl & A.C. Öhman 1845 : Dresden, Adler u. Dietze

Fiskars

Helsingfors : A.W. Gröndahl & A.C. Öhman 1845 : Dresden, Adler u. Dietze

Svecia Norvegia Russia Moscovitica. 1699 - 1

Viduae 1703