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Sampling Methods: Sample Types

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Sediment Core Sectioning and Extraction of Pore Waters under Anoxic Conditions

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Published on: March 7, 2016

Chemometric approach to visualize and easily interpret data from sequential extraction procedures applied to sediment

Mónica B Alvarez¹, Pamela Y Quintas², Claudia E Domini¹

¹Instituto de Química del Sur, INQUISUR (UNS-CONICET), Av. Alem 1253, B8000CPB Bahía Blanca, Buenos Aires, Argentina.

Journal of Hazardous Materials

|May 13, 2014

Summary

This study assessed metal mobility in Bahía Blanca estuary sediments. Cadmium (Cd) and zinc (Zn) were found in more available fractions, while chromium (Cr), copper (Cu), lead (Pb), and nickel (Ni) were in less available forms.

Keywords:

Four-way Tucker model Metal fractionation Oxide phases Sediment samples Sequential extraction procedures

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Area of Science:

Environmental Chemistry
Marine Geochemistry
Sedimentology

Background:

Coastal sediments act as sinks and sources for metals.
Understanding metal mobility is crucial for assessing environmental risk in estuaries.
Bahía Blanca estuary faces potential metal contamination due to its industrial and port activities.

Purpose of the Study:

To evaluate the mobility and availability of specific metals (Cd, Cr, Cu, Pb, Ni, Zn) in coastal surface sediments.
To compare two distinct sequential extraction procedures for metal fractionation.
To determine metal associations with different sediment components (oxides, organic matter).

Main Methods:

Application of two sequential extraction procedures to oxic sediment samples.
Analysis of six potentially hazardous metals: Cadmium (Cd), Chromium (Cr), Copper (Cu), Lead (Pb), Nickel (Ni), and Zinc (Zn).
Multivariate analysis using the Tucker4 model to interpret metal fractionation data.

Main Results:

The Tucker4 model explained 64.05% of the variance, effectively visualizing metal behavior.
Cadmium (Cd) and Zinc (Zn) were predominantly found in the more bioavailable fractions.
Nickel (Ni), Chromium (Cr), Copper (Cu), and Lead (Pb) were mainly associated with less available sediment fractions.
Zinc (Zn) and Copper (Cu) showed association with the organic matter fraction.

Conclusions:

Sequential extraction and multivariate analysis provide comparable insights into metal partitioning.
Metal availability in Bahía Blanca estuary sediments varies significantly, with implications for ecological risk assessment.
Cd and Zn represent higher mobility risks, while Ni, Cr, Cu, and Pb are more sequestered in the sediment matrix.