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Concentration of selected metals in two Steed Pond samples compared with the average for Savannah River Site (SRS) sediments (Pickett et al., 1985).

 
Steed Pond samples
Metals Avg. for SRS soils/sediments S1 S2
mg kg−1
As 18.6 17.4
Cd 0.5 1.1
Co 6.4 11.0
Cr 38 113 175
Cu 18 52.1 76.5
Ni 10 946 1922
Pb 13 60.6 91.6
U 2 1727 2260



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Physical and chemical characteristics of two contaminated sediment strata from Steed Pond.

 
Sediment zone
Characteristics S1 S2
Depth, cm 2–7 7–22
pH† 4.4 4.1
CDB Ext. Fe, g kg−1 2.9 3.2
Organic C, g kg−1 § 123 49
Particle-size distribution¶ Mineralogy
Sand, % #q >> fel 25.7 19.2
Silt, % q > k >> fel 35.8 45.2
Clay, % k >> HIV > gibb > goe > q 38.5 35.6
2:1 solution/soil ratio in deionized water.
CDB, citrate–dithionite–bicarbonate extraction (Jackson et al., 1986).
§ Total organic C, dry combustion method (Nelson and Sommers, 1982).
Micro-pipette method (Miller and Miller, 1987).
# Mineralogy determined by x-ray diffraction; fel = feldspar, k = kaolinite, HIV = hydroxy-interlayered vermiculite, gibb = gibbsite, q = quartz, goe = goethite.



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MinteqA2 input parameters based on the batch equilibration data for sediment S1 and S2 amended with 50 kg−1 HA in either a 0.01 M CaCl2 or 0.02 M KCl background solution.

 
pH Ca K Cl PO4 Ni Al† U
mg L−1 μg L−1
S1
KCl 5.17 164 782 709 14.8 869 246 29.83
CaCl2 5.00 401 3.76 709 10.7 1604 39 25.33
S2 KCl 5.46 154 782 709 6.7 943 1.0 9.02
CaCl2 5.24 401 0.80 709 5.0 1774 1.0 7.76
Total soluble Al was entered as 1.0 μg L−1 for S2, although the actual analytical total was < 1.0 μg L−1



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MinteqA2 calculated saturation indices for select Al, Ni, and U (uranyl) phases based on the batch equilibration data for sediment S1 and S2 amended with 50 g kg−1 HA in either a 0.01 M CaCl2 or 0.02 M KCl background solution.

 
HA Variscite Ni(OH)2 Ni3(PO4)2 Autunite H-autunite K-autunite
S1 KCl −3.346 2.597 −5.60 −8.58 −4.70 −6.45 −1.40
CaCl2 −3.149 1.751 −5.68 −8.66 −4.87 −6.58 −6.50
S2
KCl −2.492 0.473 −4.97 −8.26 −5.32 −7.55 −1.90
CaCl2 −2.477 0.125 −5.14 −8.55 −5.48 −7.64 −8.41