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Biogeochemistry of heavy metals in coastal lagoons
De Lacerda, L.D. (1994). Biogeochemistry of heavy metals in coastal lagoons, in: Kjerfve, B. (Ed.) Coastal lagoon processes. Elsevier Oceanography Series, 60: pp. 221-241. hdl.handle.net/10.1016/s0422-9894(08)70013-8
In: Kjerfve, B. (Ed.) (1994). Coastal lagoon processes. Elsevier Oceanography Series, 60. Elsevier Science: Amsterdam. ISBN 0-444-55556-0. xx, 577 pp., more
In: Elsevier Oceanography Series. Elsevier: Oxford; New york; Amsterdam. ISSN 0422-9894, more

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    Marine

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  • De Lacerda, L.D.

Abstract
    Coastal lagoons are temporary sinks for most trace metals with accumulation primarily controlled by sedimentation rates and metal loads. Sabkha environments, however, can be enriched with certain metals both actively and differentially through rapid sulfide formation mediated by stromatolite-forming cyanobacteria. Typical brackish water coastal lagoons can export metals, in particular, those soluble under anoxic conditions, such as manganese (Mn) and arsenic (As), and those forming stable chloro-complexes, such as cadmium (Cd). Organic compounds resulting from partial degradation of organic matter under anoxic conditions, as well as organic substances released by phytoplankton, can also form complexes and eventually export certain metals to coastal waters. Water chemistry of most trace metals in coastal lagoons is highly dependent on biological processes occurring in the water column that effect pH, dissolved oxygen, and quantity and quality of dissolved organic substances.

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