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Impact of Sample Preparation on Mineralogical Analysis of Zero-Valent Iron Reactive Barrier Materials

Environmental Sciences Division, Oak Ridge National Lab., P.O. Box 2008, Oak Ridge, TN 37831

View larger version (76K): [in a new window]   Fig. 1. Location of (a) angled cores in the Fe0 portion of the barrier and (b) vertical core through the whole Fe0 PRB. Figure not to scale.

View larger version (33K): [in a new window]   Fig. 2. Flowchart of the different mineralogical preparation treatments.

View larger version (34K): [in a new window]   Fig. 3. X-ray diffractograms showing the minerals present in different size fractions of acetone-dried, reduced loose core material (Samples 1 and 2a-1) (A, aragonite; C, calcite; F, zero-valent iron; GR, green rust; M, maghemite/magnetite; Q, quartz).

View larger version (147K): [in a new window]   Fig. 4. SEM micrographs of selected minerals (a) green rust, (b) siderite, (c) goethite with elongate aragonite crystals, and (d) aragonite from an unsieved whole sample. Arrows indicate points represented by EDX analysis (insets).

View larger version (28K): [in a new window]   Fig. 5. X-ray diffractograms showing the minerals present in samples analyzed at different times since sampling of the acetone-dried treatment on the reduced loose core material (Sample 2a-2) (A, aragonite; F, zero-valent iron; GR, green rusts; K, akaganeite; M, maghemite/magnetite; Q, quartz).

View larger version (39K): [in a new window]   Fig. 6. X-ray diffractograms showing the minerals present for samples analyzed at different times since sampling (T = 0 h and T = 11 d) of acetone-dried oxidized cemented core material (Sample 3) (A, aragonite; F, zero-valent iron; G, goethite; L, lepidocrocite; M, mackinawite; S, siderite; Q, quartz).

View larger version (21K): [in a new window]   Fig. 7. X-ray diffractograms showing the minerals present for the air-dried (25°C) and oven-dried (65 and 105°C) treatments of the reduced loose core material (Samples 2b–d) (A, aragonite; C, calcite; F, zero-valent iron; M, maghemite/magnetite; Q, quartz).