NDLI: Creating metal-spiked bed sediments: a case study from Orewa estuary, New Zealand.

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Creating metal-spiked bed sediments: a case study from Orewa estuary, New Zealand.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Lu, Xueqiang Bibby, Rebecca L. Ford, Richard B. Webster-Brown, Jenny G.
Spatial Coverage	New Zealand
Description	Country affiliation: New Zealand Author Affiliation: Lu X ( School of Geography, Geology and Environmental Science, SLeigh Marine Laboratory, University of Auckland, Private Bag 92019, Auckland, New Zealand. xueqianglu@gmail.com)
Abstract	Spiking sediments to achieve target concentrations of heavy metal pollutants is a key step in sediment toxicity tests. It is difficult, however, to ensure that metals in an artificially spiked sediment will behave naturally. A method has been developed in the present study to create Cu-, Pb-, and Zn-spiked sediments in which naturally occurring adsorption onto sediment surfaces is the dominant process binding the metals and in which precipitation of readily redissolved minerals and other metal-bearing phases (artifacts of the spiking procedure) are avoided. Uncontaminated bed sediment from an intertidal mudflat in the Orewa estuary, New Zealand, was characterized in terms of existing metal content, optimal adsorption pH, and adsorption capacity. Competitive adsorption between Cu and Pb as well as complexation by seawater anions only slightly affected metal adsorption from seawater. Surface complexation modeling indicated that iron oxide surfaces in the sediment likely were dominating metal adsorption processes. Spiking experiments were designed using these established adsorption characteristics but with significantly higher (>100-fold) concentrations of sediments and dissolved metals and a liquid to solid (L:S) ratio of approximately 5.5. An equilibration time of at least 36 h was required to achieve a reproducible target metal concentration, which could be reliably predicted from the L:S ratio and the initial metal concentration in the spiking solution. Adsorption equilibrium remained the process governing metal binding to the sediment, and no indication was observed that the adsorption capacity of the sediment had been exceeded or that additional metal-bearing phases had been formed.
File Format	HTM / HTML
ISSN	07307268
Issue Number	10
Volume Number	27
e-ISSN	15528618
Journal	Environmental Toxicology and Chemistry
Language	English
Publisher	Wiley
Publisher Date	2008-10-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Water Pollutants, Chemical Research Support, Non-u.s. Gov't Discipline Environmental Health Metals Discipline Toxicology Journal Article New Zealand Trace Elements Geologic Sediments Thermodynamics Analysis Oxidation-reduction Discipline Chemistry Hydrogen-ion Concentration Seawater
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis

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Creating metal-spiked bed sediments: a case study from Orewa estuary, New Zealand.

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