COMMENTS ON TRACE-METAL SPECIATION IN SEAWATER OR DO ONIONS GROW IN THE SEA

被引：72

作者：

MACKEY, DJ ^{[1
]}

ZIRINO, A ^{[1
]}

机构：

[1] USN COMMAND, CTR CONTROL & OCEAN SURVEILLANCE, DIV RDT&E, SAN DIEGO, CA 95152 USA

来源：

ANALYTICA CHIMICA ACTA | 1994年 / 284卷 / 03期

关键词：

ATOMIC ABSORPTION SPECTROMETRY; COMPLEXATION IN NATURAL WATERS; ORGANIC COMPOUNDS; SEA WATER; TRACE METALS; WATERS;

D O I：

10.1016/0003-2670(94)85068-2

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Recent research has suggested that trace metals in seawater are almost completely complexed by organic compounds. The organic compounds seem to be very selective for a given metal, and form complexes having very high conditional stability constants (log K-cond=10-18). Measurements of the strong copper complexing capacity of seawater (using a technique based on competition with Chelex-100 resin), in the presence of weak ligands and reducing agents, are incompatible with this model. We propose that trace metals in seawater are mainly in the colloidal state with coordination bonds holding the colloid particles together. The speciation of trace metals in seawater is determined by kinetics and not by thermodynamics.

引用

页码：635 / 647

页数：13

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