Scleractinian coral skeletons are made mainly of calcium carbonate in the form of aragonite. The mineral deposition occurs in a biological confined environment, but it is still a theme of discussion to what extent the calcification occurs under biological or environmental control. Hence, the shape, size and organization of skeletal crystals from the cellular level through the colony architectur...

Dust inputs to the oligotrophic waters of subtropical North Atlantic are significant importance biogeochemistry region. In this work, we present fluxes particles, soluble elements (H+, major ions, Fe and organic ions) in dry deposition (DD) wet (WD) samples collected between September 2012 April 2016. Positive Matrix Factorization Model (PMF) indicated four dominant factors influencing elementa...

Research has demonstrated that metallic nanoparticles produce toxicity in aquatic organisms that is due largely to effects of particulates as opposed to release of dissolved ions. The present research examined the interplay of nanoparticle composition and dissolution on response of the zebrafish gill following exposure to toxic (nanocopper or nanosilver) or nontoxic (nano-TiO2) nanometals. Fema...

The solubility of humic substances (HS) increases with pH. However, when in the presence of appropriate concentrations of transition metals in solution, soluble HS flocculate as a consequence of the aggregation processes promoted by the metallic ions. This is of great environmental interest as HS can retain large amounts of metallic ions at low pH. They can also form soluble complexes with thes...

CuO nanoparticles (CuO-NP) were synthesized in a hydrogen diffusion flame. Particle size and morphology were characterized using scanning mobility particle sizing, Brunauer-Emmett-Teller analysis, dynamic light scattering, and transmission electron microscopy. The solubility of CuO-NP varied with both pH and presence of other ions. CuO-NP and comparable doses of soluble Cu were applied to duckw...

Previously, 131iodide contamination of sodium o-'31iodohippurate (radio Hippuran) and other radioiodinated pharmaceuticals has been determined by time consuming chromatographic procedures, followed by strip scanning, strip segment counting, or autoradiographic procedures for quantitating the spots (1, 2). A simple technique has been developed for the assay of radioiodide con tamination of water...

The role of F− in the corrosion stainless steel at stage occluded cell a mixture chloride, fluoride, and sulfate ions was investigated. A simulated designed using an elaborate rust layer. Composite electrodes were used to monitor variation concentration ions, pH, dissolved oxygen solution. results show that influence on 304 steel, stage, is dependent. When F−/Cl− ratio higher than 2, can be sig...

A method for the preconcentration and determination of Cr(III), Co(II), Cu(II), Fe(III) and Pb(II) ions by atomic absorption spectrometry has been described. The method was based the collection of metal-calmagite complexes on a soluble cellulose nitrate membrane filter. The detection of the solution was obtained by flame atomic absorption spectrometry (FAAS) after completely dissolving the memb...