COMPLEXATION OF ZINC BY NATURAL ORGANIC-LIGANDS IN THE CENTRAL NORTH PACIFIC
COMPLEXATION OF ZINC BY NATURAL ORGANIC-LIGANDS IN THE CENTRAL NORTH PACIFIC
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DOI：
10.4319/lo.1989.34.2.0269
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发表时间：
1989-03-01
影响因子：
4.5
通讯作者：
BRULAND, KW
中科院分区：
文献类型：
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作者：
BRULAND, KW
在北太平洋中部 600 m 上部，天然有机配体与锌的络合作用是在薄汞膜、旋转玻碳圆盘电极上采用微分脉冲阳极溶出伏安法测定的。地表水中溶解的锌中 > 98% 被低浓度 (1.2 nM) 存在的相对锌特异性有机配体结合成强复合物 (log K''cond, Zn2+ = 11.0)。尽管这类配体的垂直分布相对均匀，但总溶解锌的浓度变化范围从北太平洋中部地表水中接近 0.1 nM 到 500 m 处的 3 nM。这类有机配体与溶解的锌发生络合，导致无机锌的浓度从地表水中的 2 pM 变化到 500 m 处的 2 nM，变化了 1,000 倍。北太平洋中部地表水中的游离锌活性（以 pZn 表示）计算为 12.7 左右。这种低游离锌离子活性可能会影响海洋和浅海浮游植物物种的分布。
The complexation of zinc by natural organic ligands in the upper 600 m of the central North Pacific was determined with differential pulse anodic stripping voltammetry at a thin mercury film, rotating glassy-carbon disk electrode. Of the dissolved zinc in surface waters > 98% was bound in strong complexes (log K''cond, Zn2+ = 11.0) by relatively zinc-specific organic ligands existing at low concentrations (1.2 nM). Although the vertical distribution of this ligand class is relatively uniform, total dissolved zinc varies from concentration close to 0.1 nM in surface waters of the central North Pacific to 3 nM at 500 m. Complexation of dissolved zinc by this class of organic ligands causes the concentration of inorganic zinc to vary from 2 pM in surface waters to 2 nM at 500 m, a 1,000-fold variation. The free zinc on activity, expressed as pZn, is calculated to be of the order of 12.7 in the surface waters of the central North Pacific. This low free zinc ion activity may influence distributions of oceanic and neritic phytoplankton species.