Organic iron(III) complexing ligands during an iron enrichment experiment in the western subarctic North Pacific
Organic iron(III) complexing ligands during an iron enrichment experiment in the western subarctic North Pacific
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DOI：
10.1029/2008gl033354
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发表时间：
2008-06-17
影响因子：
5.2
通讯作者：
Wong, C. S.
中科院分区：
文献类型：
--
作者：
Kondo, Yoshiko;Takeda, Shigenobu;Wong, C. S.
铁（III）与天然有机配体的络合作用进行了研究，在中尺度铁富集实验在西亚北极北太平洋（SEEDS II）。铁输注后，配体浓度迅速增加，随后下降。虽然配体的增加可能部分受到无定形铁胶体形成的影响（12-29%），但大多数原位增加可归因于< 200 kDa的部分。受精斑的稀释可能导致配体的快速减少。在水华衰退期间，配体浓度再次增加，并且高浓度持续了10天。条件稳定常数在受精斑内外没有差异。这些结果表明，释放的铁的化学形态的强烈影响的配体的形成，在水华下降过程中观察到的配体的生产将强烈影响铁的循环和生物利用度在地表水。
Complexation of iron (III) with natural organic ligands was investigated during a mesoscale iron enrichment experiment in the western subarctic North Pacific (SEEDS II). After the iron infusions, ligand concentrations increased rapidly with subsequent decreases. While the increases of ligands might have been partly influenced by amorphous iron colloids formation (12-29%), most in-situ increases were attributable to the < 200 kDa fraction. Dilution of the fertilized patch may have contributed to the rapid decreases of the ligands. During the bloom decline, ligand concentration increased again, and the high concentrations persisted for 10 days. The conditional stability constant was not different between inside and outside of the fertilized patch. These results suggest that the chemical speciation of the released iron was strongly affected by formation of the ligands; the production of ligands observed during the bloom decline will strongly impact the iron cycle and bioavailability in the surface water.