Science Inventory

Extraction of Pentachlorophenol from Soils using Environmentally Benign Lactic Acid Solutions

Citation:

Subramanian, B., V. NAMBOODIRI, A. P. Khodadoust, AND D. D. Dionysiou. Extraction of Pentachlorophenol from Soils using Environmentally Benign Lactic Acid Solutions. JOURNAL OF HAZARDOUS MATERIALS. Elsevier Science Ltd, New York, NY, 174(1-3):263-269, (2010).

Impact/Purpose:

To inform the public.

Description:

Soil contamination with pentachlorophenol (PCP) is widespread across the globe. Soil washing/extraction is a common technique to remove this compound. Several soil washing/extraction solutions have been used but a majority of them have the problem of persistence in the environment due to their low biodegradability. Our aim was to investigate mixed solutions of lactic acid and water as potential alter- natives to surfactant solutions or organic solvent systems used for the removal of PCP from three soils: montmorillonite, a natural sediment (with organic matter), and the same sediment without organic matter (ignited sediment). This study included the optimization of the concentration of lactic acid in water for maximum extraction efficiency and the determination of linear desorption constrants for removal of PCP from the three soils with lactic acid. The effect of soil/sediment organic matter on the extraction efficiency was also studied. Initial experiments showed that 24 h was tile optimum extraction lime. High extraction efficiencies were obtained for montmorillonite (40-80%) and ignited sediment (~90%). The natural sediment exhibited low PCP extraction due to presence of organic matter, while high desorption coefficient values (~23 L/kg) were obtained for the ignited sediment. For all soils, a decrease in extraction was observed at higher concentrations of lactic acid. The specific surface area of soil/sediment was also found to be an important factor affecting tile extraction of PCP.

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Record Details:

Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Product Published Date: 02/15/2010
Record Last Revised: 01/12/2011
OMB Category: Other
Record ID: 232529

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL RISK MANAGEMENT RESEARCH LABORATORY

WATER SUPPLY AND WATER RESOURCES DIVISION

WATER QUALITY MANAGEMENT BRANCH