Zinc speciation in Lakes Manapouri and Hayes, New Zealand

被引：14

作者：

Ellwood, MJ ^{[1
]}

Hunter, KA

Kim, JP

机构：

[1] Univ Canberra, Div Sci & Design, Sch Resource Environm & Heritage Sci, Canberra, ACT 2601, Australia

[2] Univ Otago, Dept Chem, Dunedin, New Zealand

来源：

MARINE AND FRESHWATER RESEARCH | 2001年 / 52卷 / 02期

关键词：

D O I：

10.1071/MF00073

中图分类号：

S9 [水产、渔业];

学科分类号：

0908 ;

摘要：

A study of zinc complexation in Lakes Manapouri and Hayes revealed that zinc speciation in both lakes is dominated by its complexation to natural organic ligands. In Lake Manapouri, dissolved zinc concentrations increased from 0.9 nM in surface waters to similar to1.4 nM at depth. Ligand concentrations for this lake were relatively uniform uniform with depth, with values ranging between 2.9 and 4.2 nM. A similar ligand concentration was measured for Lake Hayes, which had a surface zinc concentration of 0.46 nM. Conditional stability constants (log K) for the complexation of zinc to these ligands were high, with values ranging between 10.0 and 11.1. Calculated free Zn2+ concentrations for both lakes were in the low picomolar range (5-48 pM). Such low free Zn2+ levels may limit the growth of some phytoplankton in both lakes.

引用

页码：217 / 222

页数：6

共 27 条

[1]

AHLERS WW, 1991, AUST J MAR FRESH RES, V42, P409

[2]

AHLERS WW, 1990, AUST J MAR FRESH RES, V41, P713

[3] A mesoscale phytoplankton bloom in the polar Southern Ocean stimulated by iron fertilization [J].