منابع مشابه
Thorium speciation in seawater
Since the 1960s, thorium isotopes occupy a special place in the oceanographer’s toolbox as tracers for determining rates and mechanisms of oceanic scavenging, particle dynamics, and carbon fluxes. Due to their unique and constant production rates from soluble parent nuclides of uranium and radium, their disequilibrium can be used to calculate rates and time scales of sinking particles. In addit...
متن کاملChemical speciation of trace metals in seawater: a review.
The recent development of the chemical speciation of trace metals in seawater is described. The speciation studies reveal that metal ion complexation is one of the most important processes in seawater; especially, most bioactive trace metals, such as Fe(III) and Cu, exist as complexes with ligands in dissolved organic matter. The organic ligands in seawater are characterized with metal ions sel...
متن کاملAn intercomparison of small- and large-volume techniques for thorium-234 in seawater
In this paper, an intercomparison of methods for the determination of Th in seawater is discussed. Samples were collected either from a shore-based 600 m water source, or from standard bottle casts in deep waters off Hawaii and the Southern Ocean. We compared large-volume techniques, which rely upon Mn cartridges for the collection of dissolved Th Ž . and its detection via gamma counting )200-l...
متن کاملInfluence of Speciation of Thorium on Toxic Effects to Green Algae Chlorella pyrenoidosa
Thorium (Th) is a natural radioactive element present in the environment and has the potential to be used as a nuclear fuel. Relatively little is known about the influence and toxicity of Th in the environment. In the present study, the toxicity of Th to the green algae Chlorella pyrenoidosa (C. pyrenoidosa) was evaluated by algal growth inhibition, biochemical assays and morphologic observatio...
متن کاملSpeciation of americium in seawater and accumulation in the marine sponge Aplysina cavernicola.
The fate of radionuclides in the environment is a cause of great concern for modern society, seen especially in 2011 after the Fukushima accident. Among the environmental compartments, seawater covers most of the earth's surface and may be directly or indirectly impacted. The interaction between radionuclides and the marine compartment is therefore essential for better understanding the transfe...
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ژورنال
عنوان ژورنال: Marine Chemistry
سال: 2006
ISSN: 0304-4203
DOI: 10.1016/j.marchem.2005.10.024