Impact of dissolved organic matter on mercury and methylmercury sorption to activated carbon in soils: implications for remediation

被引:0
作者
Schwartz, Grace E. [1 ,4 ]
Sanders, James P. [2 ,5 ]
McBurney, Alyssa M. [1 ,6 ]
Brown, Steven S. [3 ]
Ghosh, Upal [2 ]
Gilmour, Cynthia C. [1 ]
机构
[1] Smithsonian Environm Res Ctr, 647 Contees Wharf Rd, Edgewater, MD 21037 USA
[2] Univ Maryland Baltimore Cty, Dept Chem Biochem & Environm Engn, 1000 Hilltop Circle, Baltimore, MD 21250 USA
[3] Dow Chem Co USA, Environm Remediat & Restorat, 1790 Bldg, Midland, MI 48674 USA
[4] Oak Ridge Natl Lab, Environm Sci Div, POB 2008 MS 6038, Oak Ridge, TN 37831 USA
[5] Exponent, 1150 Connecticut Ave NW,Suite 1100, Washington, DC 20036 USA
[6] Alcami, 2320 Sci Pk Dr, Wilmington, NC 28405 USA
关键词
SULFIDE NANOPARTICLES; CONTAMINATED SEDIMENT; BIOAVAILABILITY; SULFUR; METHYLATION; ADSORPTION; BIOCHARS; AMENDMENT; DYNAMICS; BIOMASS;
D O I
10.1039/c8em00469b
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Activated carbon (AC) amendments have shown promise in reducing inorganic mercury (Hg(II) complexes, "Hg") and methylmercury (MeHg) risk in contaminated soils. However, the effectiveness of AC in Hg and MeHg immobilization has varied among studies, suggesting that site biogeochemistry might dictate efficacy. In this study, we examined the effect of dissolved organic matter (DOM) on MeHg and Hg sorption to AC. We evaluated the impact of Suwannee River Humic Acid (SRHA) on sorption to AC directly using an isotherm approach and in a soil/AC mixture using slurry microcosms. Aqueous sorption coefficients to AC (log K-AC) for Hg-SRHA and MeHg-SRHA complexes were one to two orders of magnitude lower (Hg-SRHA = 4.53, MeHgSRHA = 4.35) than those for chloride complexes (HgCl2 = 6.55, MeHgCl = 4.90) and more closely resembled the log K-AC of SRHA (3.64). In anoxic, sulfidic soil slurries, the K-AC for sulfide species appeared stronger than for chloride or SRHA species for both Hg and MeHg. AC significantly reduced porewater concentrations of both ambient MeHg and a fresh (MeHg)-Hg-199 spike, and the addition of up to 60 mg L-1 SRHA did not reduce sorption to AC. The AC also reduced ambient Hg and Hg-201 porewater concentrations, but as SRHA concentration increased, the magnitude of solid phase sorption decreased. Speciation modeling revealed that SRHA may have impacted Hg distribution to the solid phase by reducing HgS precipitation. This study highlights the need for site-specific evaluation of AC efficacy and the value in developing biogeochemical models of AC performance for Hg control.
引用
收藏
页码:485 / 496
页数:12
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