Comparison of δ53CrCr(VI) values of contaminated groundwater at two industrial sites in the eastern US with contrasting availability of reducing agents

被引：5

作者：

Novak, Martin ^{[1
]}

Sebek, Ondrej ^{[1
]}

Chrastny, Vladislav ^{[2
]}

Hellerich, Lucas A. ^{[3
]}

Andronikov, Alexandre ^{[1
]}

Martinkova, Eva ^{[1
]}

Farkas, Juraj ^{[4
]}

Pacherova, Petra ^{[1
]}

Curik, Jan ^{[1
]}

Stepanova, Marketa ^{[1
]}

Prechova, Eva ^{[1
]}

Houskova, Marie ^{[1
]}

Zoulkova, Vera ^{[1
]}

Veselovsky, Frantisek ^{[1
]}

Svobodova, Irena ^{[1
]}

Janotova, Petra ^{[1
]}

Komarek, Arnost ^{[5
]}

机构：

[1] Czech Geol Survey, Div Geochem & Labs, Geol 6, Prague 15200 5, Czech Republic

[2] Czech Univ Life Sci, Fac Environm Sci, Kamycka 129, Prague 16521 6, Czech Republic

[3] AECOM, Rocky Hill, CT 06067 USA

[4] Univ Adelaide, Dept Earth Sci, North Terrace, Adelaide, SA 5005, Australia

[5] Charles Univ Prague, Fac Math & Phys, Sokolovska 83, Prague 18675 8, Czech Republic

来源：

CHEMICAL GEOLOGY | 2018年 / 481卷

关键词：

Chromium; Isotopes; Pollution; Groundwater; Electroplating; Natural attenuation; CHROMIUM ISOTOPE FRACTIONATION; WESTERN MOJAVE DESERT; CR STABLE-ISOTOPES; HEXAVALENT CHROMIUM; CR(VI) REDUCTION; OXIDATION-REDUCTION; WATER; GEOCHEMISTRY; OXYGENATION; TRANSPORT;

D O I：

10.1016/j.chemgeo.2018.01.033

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Natural attenuation of groundwater contaminated by toxic hexavalent chromium [Cr(VI)] was studied at two industrial sites in the eastern U.S. Concentration and isotope composition of the residual Cr(VI) were determined at site A in Connecticut whose aquifer was polluted by electroplating solutions between 1930 and 1995, and at site B in New Jersey whose aquifer was polluted by soluble chromium-processing wastes between 1911 and 1963. Site A was characterized by lower mean Cr(VI) concentrations (2 mg L-1) and lower mean delta(CrCr)-Cr-53(VI) values (1.84%) in groundwater than site B (200 mg L-1 and 2.89%, respectively). delta(CrCr)-Cr-53(VI) values were strongly positively correlated with dissolved organic carbon (DOC; p = 0.002), but not with dissolved ferrous iron [Fe(II)], or divalent manganese [Mn(II)], indicating that DOC may have played a major role in spontaneous reduction of the mobile carcinogenic Cr(VI) to immobile non-toxic Cr(III). At site B, the supply of DOC may be nearly unlimited, due to the presence of a buried organic meadow mat at a depth of six meters below the ground surface. At site A, contaminated groundwater has been extracted and treated since 1995. The mean delta(CrCr)-Cr-53(VI) values of the residual aqueous contamination at site A significantly decreased over the past 15 years (p < 0.05), possibly suggesting re-oxidation and remobilization of previously precipitated pollutant Cr.

引用

页码：74 / 84

页数：11