Speciation of metals in the oceans. I. Inorganic complexes in seawater,and influence of added chelating agents |
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| Institution: | 1. Department of Chemistry, University of Mazandaran, Babolsar Postal Code 47416-95447, Iran;2. Institute of Mathematics, Physics and Mechanics & Faculty of Civil and Geodetic Engineering, University of Ljubljana, Jadranska 19, SI-1000 Ljubljana, Slovenia;1. Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001, Lisboa, Portugal;2. Chemical Engineering Department, Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa, Rua Conselheiro Emídio Navarro, 1959-007, Lisboa, Portugal;1. Institute of Physical Chemistry, Splaiul Independentei 202, Bucharest 060021, Romania;2. University of Bucharest, Faculty of Chemistry, Department of Organic Chemistry, Biochemistry and Catalysis, Panduri 90-92, Bucharest 050663, Romania;3. University of Bucharest, Faculty of Chemistry, Department of Inorganic Chemistry, Dumbrava Rosie 23, Bucharest 020462, Romania;1. Department of Chemistry, Inorganic Section, Jadavpur University, Kolkata 700 032, India;2. Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse, D-35032 Marburg, Germany;3. Departamento de Química, Universitat de les Illes Balears, Crta. deValldemossa km 7.5, 07122 Palma, Baleares, Spain;1. Institute of Physics, Vietnam Academy of Science and Technology,10 Dao Tan, Hanoi, Viet Nam;2. Department of Physics, Kyungpook National University, Daegu 702-701, Republic of Korea;3. Nuclear Data Center, Korea Atomic Energy Research Institute, Daejeon 305-353, Republic of Korea;4. Division of Advanced Nuclear Engineering, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea;5. Research Center, Dongnam Institute of Radiological and Medical Science, Busan 619-953, Republic of Korea |
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| Abstract: | The speciation of the metal ions in the surface waters of the open ocean has been computed by using critical stability constants describing all of the inorganic complexes that can be formed by the metal ions and inorganic ligands present. The stability constants used were adjusted to change the literature values from 0.10 M ionic strength to the 0.70 M ionic strength of seawater by using a new empirical technique involving experimentally observed variations of stability constants with ionic strength for complexes of similar charge types. For stability constants not listed in Critical Stability Constant compilations, values were estimated by using known trends of stability constants of similar complexes. The speciation determinations made include equilibria with suspended solid phases such as hydroxides, carbonates, and basic carbonates of the metal ions present. Perturbation of metal speciation resulting from the addition of some common chelating agents is determined and the results obtained are discussed in terms of the effects on seawater by the introduction of these chelating agents into the environment. In the 10?9 to 10?7 range of added chelant, EDTA (ethylenediaminetetraacetate), NTA (nitrilotriacetate), TPP (tripolyphosphate) and CIT (citrate) exist in the ocean primarily as their Ca(II) and Mg(II) chelates. EDTA and NTA are the dominant ligands for Cu(II) and Ni(II), while TPP is extensively complexed to Fe(III). CIT strongly influences Cu(II) speciation, while SSA (sulfosalicylate, a well-known Fe(III) reagent) has no influence on any of these metal ions or their complexes. |
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