THE ROLE OF BIOMARKERS TO ASSESS OIL-CONTAMINATED SEDIMENT QUALITY USING TOXICITY TESTS WITH CLAMS AND CRABS

2007 ◽  
Vol preprint (2008) ◽  
pp. 1 ◽  
Author(s):  
Carmen Morales-Caselles ◽  
Laura Martín-Díaz ◽  
Inmaculada Riba ◽  
Carmen Sarasquete ◽  
T. Angel DelValls
Keyword(s):  
Sediment Quality ◽  
Toxicity Tests ◽  
Contaminated Sediment

THE ROLE OF BIOMARKERS TO ASSESS OIL-CONTAMINATED SEDIMENT QUALITY USING TOXICITY TESTS WITH CLAMS AND CRABS

2008 ◽  
Vol 27 (6) ◽  
pp. 1309 ◽  
Author(s):  
Carmen Morales-Caselles ◽  
María Laura Martín-Díaz ◽  
Inmaculada Riba ◽  
Carmen Sarasquete ◽  
Tomás Ángel DelValls
Keyword(s):  
Sediment Quality ◽  
Toxicity Tests ◽  
Contaminated Sediment

Sequential risk mitigation and the role of natural recovery in contaminated sediment projects

1998 ◽  
Vol 37 (6-7) ◽  
pp. 331-336 ◽  
Author(s):  
Stephen Garbaciak ◽  
Philip Spadaro ◽  
Todd Thornburg ◽  
Richard Fox
Keyword(s):  
Lower Cost ◽  
Risk Mitigation ◽  
Management Strategies ◽  
Source Control ◽  
Contaminated Sediment ◽  
Practical Observation ◽  
Ecosystem Recovery ◽  
Natural Recovery ◽  
Natural Processes

Sequential risk mitigation approaches the remediation of contaminated sediments in three phases designed to: (1) immediately reduce the ecological and human health risks associated with high levels of contamination, using methods such as the confinement or capping of high-risk materials; (2) reduce the risks associated with moderate levels of pollution to a minimum, on a less urgent schedule and at a lower cost; and (3) address areas of limited contamination through a combination of natural recovery and enhanced natural recovery (to aid or speed those natural processes). Natural recovery, the reduction of contaminant concentrations through natural processes, is based on the practical observation that overall ecosystem recovery appears to be largely a function of time. Sediment decomposition and the mixing of new and old sediments by bottom-dwelling organisms can both contribute to reduced contaminant concentrations. Knowledge of these processes--sediment decomposition, sediment mixing by bottom-dwelling organisms, and chemical residence time is critical in the development of appropriate ecosystem recovery and waste management strategies. Evaluations to support natural recovery predictions are designed to collect and evaluate information necessary to determine whether surface sediment chemical concentrations, with adequate source control, will reach the cleanup standards within a ten-year period.

The role of Campsurus notatus (Ephemeroptera: Polymitarcytidae) bioturbation and sediment quality on potential gas fluxes in a tropical lake

Hydrobiologia ◽  
2007 ◽  
Vol 586 (1) ◽  
pp. 143-154 ◽  
Author(s):  
João José Fonseca Leal ◽  
André Luiz dos Santos Furtado ◽  
Francisco de Assis Esteves ◽  
Reinaldo Luiz Bozelli ◽  
Marcos Paulo Figueiredo-Barros
Keyword(s):  
Sediment Quality ◽  
Tropical Lake ◽  
Gas Fluxes

scholarly journals Chaetoceros gracilis AS A BIOINDICATOR OF SEDIMENT QUALITY

2014 ◽  
Vol 6 (1) ◽  
Author(s):  
Rachma Puspitasari ◽  
Lestari Lestari
Keyword(s):  
Toxicity Test ◽  
Sediment Toxicity ◽  
Good Condition ◽  
Sediment Quality ◽  
Coastal Region ◽  
Toxicity Tests ◽  
Sediment Toxicity Test ◽  
Chaetoceros Gracilis ◽  
Sediment Toxicity Tests ◽  
Primary Producer

Chronic sediment toxicity tests could be used to evaluate the effects of sediment on critical stages in the life of an organism like invertebrate larvae and microalgae. Microalgae play an important role in aquatic ecosystem due to their role as producer in food chain producing organic matter and oxygen through photosynthesis process. This paper aimed to assess sediment quality of Semarang water using chronic sediment toxicity test. Research was conducted by testing 13 sediment samples from Semarang coastal region in August, 2010. Results showed that sediments exposed for 96 hours were still able to stimulate the growth of C. gracilis eventhough the copper concentration was above standard value provided by the CCME. The conclusion from this research was that sediment in Semarang still in good condition and can support growth of C. gracilis as primary producer. Chronic sediment toxicity test using C. gracilis could be combined with heavy metal measurement for sediment quality asessment. Keywords: sediment, bioindicator, diatomae, C. gracilis, chronic toxicity, Semarang

scholarly journals Correlation between the Results of Sequential Extraction and Effectiveness of Immobilization Treatment of Lead- and Cadmium-Contaminated Sediment

2010 ◽  
Vol 10 ◽  
pp. 1-19 ◽  
Author(s):  
Milena B. Dalmacija ◽  
Miljana D. J. Prica ◽  
Bozo D. Dalmacija ◽  
Srdjan D. Roncevic ◽  
Ljiljana M. Rajic
Keyword(s):  
Fly Ash ◽  
Sequential Extraction ◽  
Sediment Quality ◽  
Extraction Procedure ◽  
Risk Category ◽  
The European Union ◽  
Contaminated Sediment ◽  
Worst Case ◽  
Lead And Cadmium ◽  
Dynamic Leaching

The assessment of the quality of sediment from the Great Backi Canal (Serbia), based on the pseudo-total lead (Pb) and cadmium (Cd) content according to the corresponding Dutch standards and Canadian guidelines, showed its severe contamination with these two metals. A microwave-assisted BCR (Community Bureau of Reference of the Commission of the European Union) sequential extraction procedure was employed to assess their potential mobility and risk to the aquatic environment. Comparison of the results of sequential extraction and different criteria for sediment quality assessment has led to somewhat contradictory conclusions. Namely, while the results of sequential extraction showed that Cd comes under the high-risk category, Pb shows low risk to the environment, despite its high pseudo-total content. The contaminated sediment, irrespective of the different speciation of Pb and Cd, was subjected to the same immobilization, stabilization/solidification (S/S) treatments using kaolinite, montmorillonite, kaolinite-quicklime, montmorillonite-quicklime, fly ash, zeolite, or zeolite-fly ash combination. Semi-dynamic leaching tests were conducted for Pb- and Cd-contaminated sediment in order to assess the long-term leaching behavior of these metals. In order to simulate “worst case” leaching conditions, the semi-dynamic leaching test was modified using 0.014 M acetic acid (pH = 3.25) and humic acid solutions (20 mg TOC l-1) as leachants instead of deionized water. The effectiveness of S/S treatment was evaluated by determining diffusion coefficients (De) and leachability indices (LX). The standard toxicity characteristic leaching procedure (TCLP) was applied to evaluate the extraction potential of Pb and Cd. A diffusion-based model was used to elucidate the controlling leaching mechanisms. Generally, the test results indicated that all applied S/S treatments were effective in immobilizing Pb and Cd, and the treated sediments may be considered acceptable for “controlled utilization” based on LX values, irrespective of their different availability in the untreated samples. In the majority of samples, the controlling leaching mechanism appeared to be diffusion, which indicates that a slow leaching of Cd and Pb could be expected when the above S/S agents were applied. The TCLP results showed that all S/S samples were nonhazardous.

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