Assessment of metal leachability and toxicity from sediment potentially stored on land

Authors

  • A Baran Department of Agricultural and Environmental Chemistry, University of Agriculture, Mickiewicza Ave 21, 31-120 Cracow, Poland
  • M Tarnawski Department of Hydraulic Engineering and Geotechnics, University of Agriculture, Mickiewicza Ave 24/28, 30-059 Cracow, Poland
  • B Michalec Department of Hydraulic Engineering and Geotechnics, University of Agriculture, Mickiewicza Ave 24/28, 30-059 Cracow, Poland

DOI:

https://doi.org/10.4314/wsa.v41i5.03

Keywords:

dredged sediments, metals, leaching, toxicity, Microtox

Abstract

The aim of this study was to assess the toxicity and metal leachability from three dredged bottom sediments potentially stored on land. Washing out was conducted at a sediment dry mass to water mass ratio of 1:10. The method relies on washing out pollutants from the examined sample using water with third degree of purity in static/quasi-dynamic conditions. The investigations comprised three 27-h washing out cycles, including leaching in static conditions (19 h) and shaking (8 h). Bottom sediments are complex matrices; therefore laboratory tests cannot always reflect changes in physicochemical properties, which can potentially take place after a longer period of time. In spite of this, static-dynamic tests conducted under laboratory conditions provide information which enables a rough estimation of the potential threat posed by the studied sediment to the environment, at a given time. It was demonstrated that the leachability of metals during storage of polluted (Rybnik, Rzeszow) or unpolluted (Narożniki) bottom sediments does not pose a hazard to the environment. The Microtox test showed low toxicity of test water extracts. Considering their final destination, the potential and actual environmental hazards which the extracted bottom deposits pose should be assessed by determining the leachability of metals.

Downloads

Download data is not yet available.

Metrics

Metrics Loading ...

Downloads

Published

2015-10-29

How to Cite

A Baran, M Tarnawski, & B Michalec. (2015). Assessment of metal leachability and toxicity from sediment potentially stored on land. Water SA, 41(5 October). https://doi.org/10.4314/wsa.v41i5.03

Issue

Section

Research paper