期刊
CHEMOSPHERE
卷 147, 期 -, 页码 105-113出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2015.12.098
关键词
Iron; Bioavailability; Photoreduction; Marine phytonlankton; Macronutrient enrichment; Coastal seawater
资金
- Natural Science Foundation of China [41206096, 40506020, 21175115]
- Program for New Century Excellent Talents in University [NCET-110904]
- Project of Fujian Education Department, China [JA09164]
- Science and Technology Committee of Fujian Province, China [2012Y0065]
- State Oceanic Adminstration project [201105021]
The photoconversion of colloidal iron oxyhydroxides was a significant source of bioavailable iron in coastal systems. Diatoms dominate phytoplankton communities in coastal and upwelling regions. Diatoms are often exposed to eutrophication. We investigated the effects of different species of diatom, cell density, illumination period, and nitrate additions on the bioavailability of Fe(III) oxy-hydroxide colloids in seawaters. With the increase of illumination period from 1 to 4 h, the ratios of concentrations of total dissolved Fe (DFe) to colloidal iron oxyhydroxides and Fe(II) to DFe increased up to 24.3% and 23.9% for seawater without coastal diatoms, 45.6% and 30.2% for Skeletonema costatum, 44.3% and 29.7% for Thalassiosira weissflogii, respectively. The photochemical activity of coastal diatoms themselves (excluding the dissolved organic matter secreted by algae) on the species transformation of iron in seawater (including the light-induced dissolution of Fe(III) oxyhydroxide colloids and the photo-reduction of Fe(III) into Fe(II)) was confirmed for the first time. There was no significant difference of the ability of S. costatum and Thalassiosira weissflogii on the photoconversion of colloidal iron oxyhydroxides. The photoproduction of dissolved Fe(II) and DFe in the seawater with or without diatoms could be depressed by the nitrate addition. (C) 2015 Elsevier Ltd. All rights reserved.
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