Phosphorus Amendment Efficacy for In Situ Remediation of Soil Lead Depends on the Bioaccessible Method

Journal of Environmental Quality
John F ObryckiKristen K Minca

Abstract

A validated method is needed to measure reductions of in vitro bioaccessible (IVBA) Pb in urban soil remediated with amendments. This study evaluated the effect of in vitro extraction solution pH and glycine buffer on bioaccessible Pb in P-treated soils. Two Pb-contaminated soils (790-1300 mg Pb kg), one from a garden and one from a city lot in Cleveland, OH, were incubated in a bench scale experiment for 1 yr. Six phosphate amendments, including bone meal, fish bone, poultry litter, monoammonium phosphate, diammonium phosphate, and triple superphosphate, were added to containers at two application rates. Lead IVBA was assessed using USEPA Method 1340 and three modified versions of this method. Modifications included using solutions with pH 1.5 and 2.5 as well as using solutions with and without 0.4 mol L glycine. Soil amendments were ineffective in reducing IVBA Pb in these soils as measured by pH 1.5 with glycine buffer. The greatest reductions in IVBA Pb, from 5 to 26%, were found using pH 2.5 extractions. Lead mineral results showed several soil amendments promoted Pb phosphate formation, an indicator of remediation success. A significant negative linear relationship between reduction in IVBA Pb and Pb-phosphate formation w...Continue Reading

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Citations

Oct 19, 2016·Environmental Pollution·John F ObryckiNicholas T Basta
Oct 8, 2019·Journal of Environmental Quality·Pacian NetherwayJorge Paz-Ferreiro
Jul 18, 2020·International Journal of Phytoremediation·Sara Perl EgendorfZhongqi Cheng
Jan 3, 2018·Journal of Environmental Quality·Chammi P AttanayakeMichel D Ransom
Apr 6, 2017·Journal of Environmental Quality·John F ObryckiSteven W Culman
Feb 2, 2016·Journal of Environmental Quality·Kuldip Kumar, Lakhwinder S Hundal
Oct 24, 2018·Environmental Science & Technology·Shannon A PlunkettDouglas J Soldat
Oct 19, 2021·Journal of Environmental Quality·Daniel G Strawn, Ganga M Hettiarachchi

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