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TECHNICAL REPORT
Heavy Metals in the Environment

In Situ Stabilization of Soil Lead Using Phosphorus

^a Remediation and Containment Branch, National Risk Management Research Lab., USEPA, 5995 Center Hill Ave., Cincinnati, OH 45224-1702
^b Dep. of Agronomy, Throckmorton Plant Sciences Center, Kansas State Univ., Manhattan, KS 66506-5501

* Corresponding author (hettiarachchi.ganga{at}epa.gov)

Received for publication May 4, 2000. In situ stabilization of Pb-contaminated soils can be accomplished by adding phosphorus. The standard remediation procedure of soil removal and replacement currently used in residential areas is costly and disruptive. This study was carried out to evaluate the influence of P and other soil amendments on five metal-contaminated soils and mine wastes. Seven treatments were used: unamended control; 2500 mg of P/kg as triple superphosphate (TSP), phosphate rock (PR), acetic acid followed by TSP, and phosphoric acid (PA); and 5000 mg of P/kg as TSP or PR. A significant reduction in bioavailable Pb, as determined by the physiologically based extraction test (PBET), compared with the control upon addition of P was observed in all materials tested. Increasing the amount of P added from 2500 to 5000 mg/kg also resulted in a significantly greater reduction in bioavailable Pb. Phosphate rock was equally or more effective than TSP or PA in reducing bioavailable Pb in four out of five soils tested. Preacidification produced significantly lower bioavailable Pb compared with the same amount of P from TSP or PR in only one material. Reductions in Pb bioavailability as measured by PBET were evident 3 d after treatment, and it may indicate that the reactions between soil Pb and P occurred in situ or during the PBET. No further reductions were noted over 365 d. X-ray diffraction data suggested the formation of pyromorphite-like minerals induced by P additions. This study suggests that P addition reduced bioavailable Pb by PBET and has potential for in situ remediation of Pb-contaminated soils.

Abbreviations: AR, active repository • HP, hydroxypyromorphite • PA, phosphoric acid • PBET, physiologically based extraction test • PR, phosphate rock • TCR, time critical repository • TSP, triple superphosphate • XRD, X-ray diffraction

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