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High resolution monitoring of dissolved Cu and Co in coastal surface waters of the western North Sea (2003)

Achterberg, Eric P. ; Van Den Berg, C. M. G. ; Colombo, C.

Elsevier

In: Continental Shelf Research, 23 (6). pp. 611-623.

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Publication Date: 2014-02-04

Description: This paper discusses the distribution of dissolved Cu and Co in coastal surface waters of the western North Sea. High resolution data (more than 5500 (Cu) and 12000 (Co) data points), obtained using on-line flow-analysis techniques, clearly showed enhanced trace metal levels near the coast and estuarine outflows. In an offshore direction, the high metal levels were gradually diluted with metal-depleted seawater originating in the North Atlantic. The data indicated benthic sources for Cu and Co due to diagenetic remobilisation, sediment resuspension with injection of interstitial waters into the overlaying water and/or desorption from resuspended particles. Some evidence of biological removal of dissolved Cu was apparent in offshore coastal waters with enhanced chlorophyll concentrations. The study demonstrates how high resolution trace metal data allows us to deconvolute complex metal input and removal processes in dynamic coastal waters. © 2003 Elsevier Science Ltd. All rights reserved.

Type: Article , PeerReviewed

Format: text

DOI: 10.1016/S0278-4343(03)00003-7

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Determination of the complex stability of zinc with carbonic anhydrase in sea-water (2001)

Sarthou, G. ; van den Berg, C. M. G. ; Riebesell, Ulf

Royal Society of Chemistry

In: Analyst, 126 (11). pp. 2036-2039.

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Publication Date: 2016-04-25

Description: Carbonic anhydrase (CA) is inactive unless associated with zinc, with possible substitution by cobalt. In this work, the complexation of zinc by CA was determined in sea-water using cathodic stripping voltammetry (CSV) with ligand competition. The zinc was found to be released from the CA over a period of 3 h when equilibrated with a competing complexing ligand and the complex was re-formed with the CA when zinc was added. A value of 8.90+/-0.27 was found for logK'ZnCA where K'ZnCA is the conditional stability constant for the complex of Zn2+ with CA in pH 8 sea-water. A value for the molecular weight of CA was calculated from its equivalent ligand concentration (in nM) obtained by titrations with zinc at various CA concentrations (1-4 mg l(-1)). The value found (34740 g mol(-1)) for the molecular weight is consistent with values found previously by other methods (29000-31000 g mol(-1)) confirming that the stoichiometry of the complex between zinc and CA is 1:1. This work confirms that the zinc-CA complex is reversible and that the interaction between zinc and CA can be determined using CSV with ligand competition.

Type: Article , PeerReviewed

Format: text

DOI: 10.1039/b105364g

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