Evaluation of Contaminated Sediments by Toxicity Characteristic Leaching Procedure Extraction Techniques

Hardaway, C. Scott; Gauthreaux, Kermit; Sneddon, Joseph; Beck, James N.

doi:10.1006/mchj.1999.1803

Cited by 18 publications

(8 citation statements)

References 3 publications

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“…Here, the TCLP method as developed by the U.S. EPA [16] is employed to simulate the leaching of metals from landfill disposal of contaminated materials by organic acid leac hates, with the purpose of classifying the spent AB as hazardous or nonhazardous (i.e., inert) waste [28]. The data reported in Tables 2 and 3 are the average of two duplicate runs with samples prepared in separate vials.…”

Section: The Toxicity Characteristic Leaching Procedures (Tclp)mentioning

confidence: 99%

Increasing the arsenate adsorption capacity of neutralized red mud (Bauxsol)

Genç-Fuhrman

Tjell

McConchie

2004

Journal of Colloid and Interface Science

147

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Section: The Toxicity Characteristic Leaching Procedures (Tclp)mentioning

confidence: 99%

Increasing the arsenate adsorption capacity of neutralized red mud (Bauxsol)

Genç-Fuhrman

Tjell

McConchie

2004

Journal of Colloid and Interface Science

147

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“…Metals may be immobilized in the sediments for a long time, but in variable atmospheric conditions they may be easily leached from the sediments and pose a hazard of returning the element to cycling in nature (Rabajczyk, 2011;Baran et al, 2011;Baran and Tarnawski, 2013). Mobility of pollutants leached from the sediments, expressed as their susceptibility to leaching from the matrix, is the most important feature of waste from an ecological perspective, and which, apart from composition, is taken into consideration in the assessment of the waste's harmfulness to the environment (Hardaway et al, 1999). Leachability is a tendency to form harmful leachates in contact with water, and is an important feature of stored wastes (Stephens et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

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

Baran¹,

Tarnawski²,

Michalec³

2016

WSA

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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, Rzeszów) 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.

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“…Leaching of contaminants from sediments is influenced by element chemistry, pH, redox potential, complexation, liquid-to-solid ratio (L/S), contact time, and biological activity (van der Sloot et al, 1996). In the United States, the toxicity characteristic leaching procedure (TCLP) is used to determine whether or not a waste product (including harbor sediment) is considered a hazardous waste (U.S. EPA, 1992;Hardaway et al, 1999). pH-dependent leaching tests have been used to evaluate the potential leaching at different pH values, and for evaluation of reuse of harbor sediment or products containing harbor sediments (Karius and Hamer, 2001).…”

Section: Introductionmentioning

confidence: 99%

Leaching Properties of Estuarine Harbor Sediment before and after Electrodialytic Remediation

Gardner

Nystroem

Aulisio

2007

Environmental Engineering Science

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Electrodialytic remediation (EDR) can be used to extract heavy metals from a variety of different media. In this work, contaminated harbor sediments from two locations in the United States and one in Norway were subjected to EDR, and were compared with batch extractions conducted with the sediment. pH-dependent leaching tests were used to evaluate changes in leaching properties of treated and control sediments. Significant fractions of total concentrations were removed during treatment (35-95% with an average of 75% for all sediments and elements investigated). The release of elements in pH-dependent leaching tests, however, demonstrated equal or greater leaching from treated sediments in the neutral pH range. Dissolved organic carbon appears to be a significant contributor to post-treatment increases in leaching, and dissolution of significant iron and aluminum sorption sites is hypothesized to also play a role. This research highlights the importance of understanding contaminant speciation and availability, as total metals concentrations, in this particular case, do not relate to estimates of the environmental availability of metals (total concentrations were typically two to three orders of magnitude greater than concentrations released during pH-dependent leaching).

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Evaluation of Contaminated Sediments by Toxicity Characteristic Leaching Procedure Extraction Techniques

Cited by 18 publications

References 3 publications

Increasing the arsenate adsorption capacity of neutralized red mud (Bauxsol)

Increasing the arsenate adsorption capacity of neutralized red mud (Bauxsol)

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

Leaching Properties of Estuarine Harbor Sediment before and after Electrodialytic Remediation

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