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Stabilization of Pb and Cd contaminated soils and soil quality improvements using waste oyster shells

Stabilization of Pb and Cd contaminated soils and soil quality improvements using waste oyster shells,10.1007/s10653-010-9329-3,Environmental Geochemi

Stabilization of Pb and Cd contaminated soils and soil quality improvements using waste oyster shells   (Citations: 2)
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Large amounts of oyster shells are produced as a by-product of shellfish farming in coastal regions without beneficial use options. Accordingly, this study was conducted to evaluate the potential for the use of waste oyster shells (WOS) containing a high amount of CaCO3 to improve soil quality and to stabilize heavy metals in soil. To accomplish this, an incubation experiment was conducted to evaluate the ability of the addition of 1–5 wt% WOS to stabilize the Pb (total 1,246 mg/kg) and Cd (total 17 mg/kg) in a contaminated soil. The effectiveness of the WOS treatments was evaluated using various single extraction techniques. Soil amended with WOS was cured for 30 days complied with the Korean Standard Test method (0.1 M·HCl extraction). The Pb and Cd concentrations were less than the Korean warning and countermeasure standards following treatment with 5 wt% WOS. Moreover, the concentrations of Cd were greatly reduced in response to WOS treatment following extraction using 0.01 M·CaCl2, which is strongly associated with phytoavailability. Furthermore, the soil pH and exchangeable Ca increased significantly in response to WOS treatment. Taken together, the results of this study indicated that WOS amendments improved soil quality and stabilized Pb and Cd in contaminated soil. However, extraction with 0.43 M·CH3COOH revealed that remobilization of heavy metals can occur when the soil reaches an acidic condition.
Journal: Environmental Geochemistry and Health - ENVIRON GEOCHEM HEALTH , vol. 33, no. 1, pp. 83-91, 2011
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    • ...Soil contaminated with heavy metals was collected from the Seoseong mine located at Seosan-si in Chungnam Province, Korea (Ok et al. 2010)...
    • ...Pulverized eggshell waste with a particle size of \1 mm and CaCO3 (98% of purity) were added to the Pb- and Cd-contaminated soils at two levels (1 and 5% by weight) (Ok et al. 2010)...
    • ...The specific experimental conditions of each single extraction with different extractants are presented in Table 3 (Ok et al. 2010)...
    • ...Table 2 Physicochemical properties of the selected soil (Ok et al. 2010)...
    • ...In this study, 0.01 M CaCl2, 1 M CaCl2, 0.1 M HCl, 0.43 M CH3COOH, and 0.05 M EDTA were used as a single extractant to provide information about a variety of heavy metals via: (1) weak replacement of ion salts, (2) dilution of strong acid or weak acid, or (3) chelation (Ok et al. 2010)...

    Yong Sik Oket al. Application of eggshell waste for the immobilization of cadmium and le...

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