Abstract
The toxicity characteristic leaching procedure (TCLP) is the current US-EPA standard protocol to evaluate metal leachability in wastes and contaminated soils. However, application of TCLP to assess lead (Pb) leachability from contaminated shooting range soils may be questionable. This study determined Pb leachability in the range soils using TCLP and another US-EPA regulatory leaching method, synthetic precipitation leaching procedure (SPLP). Possible mechanisms that are responsible for Pb leaching in each leaching protocol were elucidated via X-ray diffraction (XRD). Soil samples were collected from the backstop berms at four shooting ranges, with Pb concentrations ranging from 5,000 to 60,600 mg kg−1 soil. Lead concentrations in the TCLP leachates were from 3 to 350 mg l−1, with all but one soil exceeding the USEPA non-hazardous waste disposal limit of 5 mg l−1. However, continued dissolution of metallic Pb particles from spent Pb bullets and its re-precipitation as cerussite (PbCO3) prevented the TCLP extraction from reaching equilibrium at the end of the standard leaching period (18 h). Thus, the standard one-point TCLP test would either over- or under-estimate Pb leachability in shooting range soils. Lead concentration in the SPLP leachates ranged from 0.021 to 2.6 mg l−1, with all soils above the USEPA regulatory limit of 0.015 mg l−1. In contrast to TCLP, SPLP leaching had reached equilibrium, with regard to both pH and Pb concentrations, within the standard 18 h leaching period, and the analytical SPLP results were in good agreement with those derived from modeling. Thus, we concluded that SPLP is a more appropriate alternative than TCLP for assessing lead leachability in range soils.
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References
Alforque, M. (1996). The Newsletter of the USEPA Region 10 Laboratory.
ASTM (2000). Annual book of ASTM standards, American Society for Testing and Materials, Soil and Rock. Vol. 4.08.
Basta, N. T., Pantone, D. J., & Tabatabai, M. A. (1993). Path analysis of heavy metal adsorption by soil. Agronomy Journal, 85, 1054–1057.
Battelle (1997). Final implementation guidance handbook: Physical separation and acid leaching to process small-arms range soils. Naval Facilities Engineering Service Center and US Army Environmental Center.
Berndt, H. (1990). Measuring the rate of atmospheric corrosion in microclimates. Journal of the American Institute for Conservation, 29, 207–220.
Cao, X., Ma, L. Q., Chen, M., Hardison, Jr., D. W., & Harris, W. G. (2003a). Weathering of lead bullets and their environmental effects at outdoor shooting ranges. Journal of Environmental Quality, 32, 526–534.
Cao, X., Ma, L. Q., Chen, M., Hardison, Jr., D. W., Harris, W. G. (2003b). Lead transformation and distribution in the soils of shooting ranges in Florida, USA. Science of the Total Environment, 307, 179–189.
Darling, C. T. R., & Thomas, V. G. (2003). The distribution of outdoor shooting ranges in Ontario and the potential for lead pollution of soil and water. Science of the Total Environment, 313, 235–243.
Dermatas, D., & Meng, X. (2003). Utilization of fly ash for stabilization/solidification of heavy metal contaminated soils. Engineering Geology, 2189, 1–18.
Gee, C., Ramsey, M. H., Maskall, J., & Thornton, I. (1997). Mineralogy and weathering processes in historical smelting slags and their effect on the mobilization of lead. Journal of Geochemical Exploration, 58, 249–257.
Ghosh, A., Mukiibi, M., & Ela, W. (2004). TCLP underestimates leaching of arsenic from solid residuals under landfill conditions. Environmental Science & Technology, 38, 4677–4682.
Halim, C. E., Scott, J. A., Natawardaya, H., Amal, R., Beydoun, D., & Low, G. (2004). Comparison between acetic acid and landfill leachates for the leaching of Pb(II), Cd(II), As(V), and Cr(VI) from cementitious wastes. Environmental Science & Technology, 38, 3977–3983.
Hardison, D. W. Jr., Ma, L. Q., Luongo, T., & Harison, W. G. (2004). Lead contamination in shooting range soils from abrasion of lead bullets and subsequent weathering. Science of the Total Environment, 328, 175–183.
Hartley, W., Edwards, R., & Lepp, N. W. (2004). Arsenic and heavy metal mobility in iron oxide-amended contaminated soils as evaluated by short- and long-term leaching tests. Environmental Pollution, 131, 495–504.
Jørgensen, S. S., & Willems, M. (1987). The fate of lead in soils: The transformation of lead pellets in shooting range soils. Ambio, 16, 11–15.
Kosson, D. S., van der Sloot, H. A., Sanchez, F., & Garrabrants, A. C. (2002). An integrated framework for evaluating leaching in waste management and utilization of secondary materials. Environmental Engineering Science, 19, 159–204.
Lin, Z. (1996). Secondary mineral phases of metallic lead in soils of shooting ranges from Orebro County, Sweden. Environmental Geology, 27, 370–375.
Nedwed, T., & Clifford, D. A. (1997). A survey of lead battery recycling sites and soil remediation processes. Waste Managagement, 17, 257–269.
Nelson, D. W., & Sommers, L. E. (1982). Total carbon, organic carbon, and organic matter. In D. R. Keeney, et al. (Eds.), Methods of soil analysis. Part 2: Chemical and microbiological properties, Vol. 9 (pp. 539–577). Madison, WI: ASA.
Reid, S., & Cohen, S. Z. (2000). A new tool to predict lead mobility in shooting range soils. Retrieved from http://www.environmentalandturf.com/firabstracts.html.
Rietveld, H. M. (1969). A profile refinement method for nuclear and magnetic structures. Journal of Applied Crystallography, 2, 65–71.
Rouff, A. A., Elzinga, E. J., & Reeder, R. J. (2004). X-ray absorption spectroscopic evidence for the formation of Pb(II) inner-sphere adsorption complexes and precipitates at the calcite–water interface. Environmental Science & Technology, 38, 1700–1707.
Sauvé, S., McBride, M., & Hendershot, W. (1998). Soil solution speciation of lead (II): Effects of organic matter and pH. Soil Science Society of America Journal, 62, 618–621.
Sturchio, N. C., Chiarello, R. P., Cheng, L., Lyman, P. F., Bedzyk, M. J., Qian, M. J., et al. (1997). Lead adsorption at the calcite–water interface: Synchrotron X-ray standing wave and X-ray reflectivity studies. Geochimica et Cosmochimica Acta, 61, 251–263.
Traina, S. J., & Laperche, V. (1999). Contaminant bioavailability in soils, sediments, and aquatic environments. Proceedings of the National Academy of Sciences of the United States of America, 96, 3365–3373.
USEPA (1992), Test methods for evaluating solid waste, physical/chemical methods, SW-846 3rd ed., Method 1311. Washington, DC.
USEPA (1994). Test methods for evaluating solid waste, physical/chemical methods, SW-846 3rd ed., Method 1312. Washington, DC.
USEPA (1996). Soil screening guidance: User’s guidance. EPA 540/R-60-018. Washington, DC: Office of Solid and Emergency Response.
USEPA (1999). Waste leachability: The need for reviewing of current agency procedures. Washington, DC.
USEPA (2001). Best management practices for lead at outdoor shooting ranges. EPA-902-B01-001. Region 2, New York, NY.
Vantelon, D., Lanzirotti, A., Scheinost, A. S., & Kretzschmar, R. (2005). Spatial distribution and speciation of lead around corroding bullets in a shooting range soils studied by micro-X-ray fluorescence and absorption spectroscopy. Environmental Science & Technology, 39, 4808–4815.
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Cao, X., Dermatas, D. Evaluating the Applicability of Regulatory Leaching Tests for Assessing Lead Leachability in Contaminated Shooting Range Soils. Environ Monit Assess 139, 1–13 (2008). https://doi.org/10.1007/s10661-007-0110-8
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DOI: https://doi.org/10.1007/s10661-007-0110-8