Leaching of Arsenic, Chromium, and Copper in a Contaminated Soil at a Wood Preserving Site

Jang, Yong-Chul; Townsend, Timothy G.; Ward, M.; Bitton, Gabriel

doi:10.1007/s00128-002-0132-4

Cited by 32 publications

(11 citation statements)

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“…It can be concluded that pH plays the most important role in the leaching process. This finding agrees well with the previous studies reporting that metals have a tendency to leach more at extreme acidic pH conditions ( Van der Sloot et al 1997;Jang et al 2002).…”

Section: Leaching Testsupporting

confidence: 94%

Chemical characteristics and acid drainage assessment of mine tailings from Akara Gold mine in Thailand

et al. 2009

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Acid Mine Drainage (AMD) is a great concern in many abandoned mines because of its adverse effect on the environment. In mining processes, many kinds of wastes are produced. These wastes may become eventually sources of environmental degradation. The focus of this study is the geochemical characterization of the end-processed tailings generated by Akara Gold Mine, the biggest gold mine in Thailand. Tailing samples were systematically collected for analyses of chemical and mineralogical compositions. As a result, their quantitative chemical analyses are slightly different from place to place, but mineral components cannot be clearly differentiated. For instance, it may be assumed that the end-processed tailings, which were a mixture between high and low grade concentrates, would have similar mineral components. However, the little variation of chemical composition may be caused by the ore refining processes that are somehow varied in proportion to chemical additives, alkali cyanide and quick lime in particular. In addition, clay composition in ore-bearing layers may also influence alumina content of tailings, accordingly. Distribution of the tailings is not related to depth and distance of the tailing storage pond because the disposal has sped them over the pond during operation. Total heavy metals of the tailing samples were analyzed on the basis of the EPA 3052 method. Consequently, the most toxic elements (e.g., Co, Cu, Cd, Cr, Pb, Ni and Zn) were found falling within the standard of Thailand Soil Quality Standards for Habitat and Agriculture. Only Mn appears to have higher content than the standard. In addition, leaching tests proved that these tailings contain low metal concentrations. As a result, at pH 2, Mn can leach out exceeding the Thailand Surface Water Quality Standard for Agricultural (Mn \1 ppm) and the Thailand Industrial Effluent Standard (\5 ppm). Although leachate at pH 4 and neutral conditions contains lower Mn than the Industrial Effluent Standard it still exceeds the surface water quality standard. Interestingly, Pb can be leached out exceeding both standards (0.2 ppm for the industrial effluent standard and 0.05 ppm for the surface water quality standard). For Ni leaching, its concentration is lower than the Industrial Effluent Standard at all pH conditions but still exceeds the Surface Water Standard at pH 2 and 4. This information should be taken into consideration for further environmental monitoring. Acid generating potential of the tailings was estimated using acid-base accounting (ABA) and net acid generation (NAG) tests. The results of ABA and NAG tests show that the tailing samples contain a high amount of sulfur. However, they also contain high acid neutralization capacity. Consequently, these tailings may not have potential to generate acid drainage; in the other words, they can be classified as a non-acid forming (NAF) material. However, since these tailings contain some heavy metals

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Section: Leaching Testsupporting

confidence: 94%

Chemical characteristics and acid drainage assessment of mine tailings from Akara Gold mine in Thailand

et al. 2009

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“…There were also high increases in the concentrations of metals in soils collected from the two studied locations when compared with the concentrations of background soils. Taken together, these findings indicate that Cr, Cu and As can easily leach and become mobile in surrounding soils, which is similar to the results of studies conducted by Stilwell and Graetz 25) and Jang et al 26) . Several factors may have contributed to the differences in concentrations of Cr, Cu and As among soil samples collected at Chuncheon and Hongcheon.…”

Section: Resultssupporting

confidence: 90%

“…The average pH of the surface soil and soil profile samples at Hongcheon (5.77 and 5.42, respectively) led to increased leaching of the metals from the constructed CCA-wood when compared to the pH of surface and profile soil samples collected from Chuncheon (7.31 and 6.5, respectively). Finally, the clay fraction percentage (10%) was higher at Hongcheon than (4.7%) at Chuncheon, which may have resulted in decreased leaching at Hongcheon due to the metals sorbing to the clay particles 26) . Overall, the following factors likely impacted the leaching of elements from the CCA-treated wood structures: 1) the direct contact of CCA-treated wood with the soil, 2) the period of service use, and 3) the retention level of the treated wood.…”

Section: Resultsmentioning

confidence: 95%

Environmental Monitoring of Heavy Metals and Arsenic in Soils Adjacent to CCA-Treated Wood Structures in Gangwon Province, South Korea

Abdelhafez¹,

Awad²,

Kim³

et al. 2009

Korean Journal of Environmental Agriculture

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Chromated copper arsenate (CCA) is a chemical wood preservative that has been intensively used to protect wood from decay during the last few decades. CCA is widely used to build structures such as decks, fences, playgrounds and boardwalks. However, structures constructed of CCA-treated wood have caused adverse environmental effects due to leaching of Cr, Cu and As into surrounding soils. This research was conducted to monitor the vertical and horizontal distribution of Cr, Cu and As in soils adjacent to CCA-treated wood structures in Korea. Two structures constructed with CCA-treated wood were selected at Hongcheon and Chuncheon in Gangwon Province, South Korea. Eleven soil profile samples were collected at depths of 0 to 80 cm at each site, while 12 surface soil samples were collected at distances of 0 to 200 cm from each structure. The soil chemical properties, soil particle size distribution and total metal concentrations were then determined. The results revealed that soils near CCA-treated wood structures were generally contaminated with Cr, Cu and As when compared to the background concentration of each metal. In addition, the concentrations of Cr, Cu and As in soils decreased as the vertical and horizontal distance from the structure increased. Further studies should be conducted to evaluate the mobility and distribution of these metals in the environment as well as to develop novel technologies for remediation of CCA contaminated soils.

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“…Although the initial pH of the SPLP solution was 4.20 AE 0.05, the final pH ranged from 7.0 to 9.11. In this range, most metals are known to be least leachable (Goumans et al, 1991;van der Sloot et al, 1997;Jang et al, 2002;Townsend et al, 2004;Dubey and Townsend, 2004).…”

Section: Leachable Concentrationmentioning

confidence: 99%

Characterization of pollutants in Florida street sweepings for management and reuse

Jang¹,

Jain²,

Tolaymat³

et al. 2009

Journal of Environmental Management

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Leaching of Arsenic, Chromium, and Copper in a Contaminated Soil at a Wood Preserving Site

Cited by 32 publications

References 0 publications

Chemical characteristics and acid drainage assessment of mine tailings from Akara Gold mine in Thailand

Chemical characteristics and acid drainage assessment of mine tailings from Akara Gold mine in Thailand

Environmental Monitoring of Heavy Metals and Arsenic in Soils Adjacent to CCA-Treated Wood Structures in Gangwon Province, South Korea

Characterization of pollutants in Florida street sweepings for management and reuse

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