Ruggedness test of an aqua regia extraction method made with the geochemical reference material GXR-2

Backman, Christian; Gustavsson, N.

doi:10.1002/(sici)1099-128x(199609)10:5/6<371::aid-cem462>3.3.co;2-r

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“…Samples were immediately frozen with dry ice until processing in the laboratory for analysis. The European Community Bureau of Reference (BCR) sequential procedure for biosolids was used to extract the exchangeable, reducible, and oxidizable metal fractions (Sahuquillo et al, 1999), and total metal concentrations were determined by an acid digestion (Backman and Gustavsson, 1996). Barium, Cd, Cu, Ni, Pb, and Zn were analyzed by inductively coupled plasma–atomic emission spectroscopy (Spectro CirOS VISION ICP Model FVS12 with CETAC Autosampler Type: ASX‐520HS, inductively coupled plasma atomic emission spectroscopy [ICP–AES]).…”

Section: Methodsmentioning

confidence: 99%

Chemistry and Transport of Metals from Entrenched Biosolids at a Reclaimed Mineral Sands Mining Site

et al. 2010

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Deep row incorporation of biosolids is an alternative land treatment method whose typically high rates may result in elevated pollutant transport. The objectives of this research were to compare the effects of entrenched biosolids stabilization type and rate on heavy metal chemistry and mobility. Two rates each of Alexandria (Virginia) Sanitation Authority anaerobically digested (213 and 426 dry Mg ha(-1)) and Blue Plains (Washington, DC) lime-stabilized (329 and 657 dry Mg ha(-1)) biosolids were placed in trenches at a mineral sands mine reclamation site in Dinwiddie County, Virginia, in summer 2006. Vertical and lateral transport of heavy metals from the biosolids seams were determined by analyzing leachate collected in zero tension lysimeters below the trenches and suction lysimeters adjacent to the trenches. Silver, Cd, Pb, and Sn did not move vertically or laterally to any significant extent. During the 15-mo period following entrenching, lime-stabilized biosolids produced higher cumulative metal mass transport for Cu (967 g ha(-1)), Ni (171 g ha(-1)), and Zn (1027 g ha(-1)) than did the anaerobically digested biosolids and control. Barium mass loss was similar for both biosolids. All metals moved primarily with particulates. MINTEQA) predicted that > 70% of Cu was bound to fulvic acids, whereas > 80% of Ba was found as Ba2+. As pH decreased with time, free ions of Zn decreased and the metal's association with fulvic acids increased. Largely insignificant transport of metals into the lysimeters demonstrated that biosolids-borne heavy metals posed little risk to groundwater even when entrenched in very coarse-textured soil.

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Section: Methodsmentioning

confidence: 99%