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QUANTITATIVE COMPARISON OF HEAVY METALS AND METALOIDS IN AGRICULTURAL AND FOREST SOILS IN BOWLING GREEN, OHIO

Neupane, Ghanashyam
http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1147699490

Abstract Details

2006, Master of Science (MS), Bowling Green State University, Geology.
Quantitative comparisons of As, Cr, Cu, Ni, Pb, and Zn in arable and forest soils near Pemberville, Ohio were examined in 60 samples from 10 sites. Samples were collected along a vertical profile at 10 cm interval. Soils contain a large proportion of fines (~ 32% clay and ~37% silt) with quartz, illite, dickite, and chlorite minerals. Surface soils in the arable land are slightly acidic (pH ~ 6.5) while forest soils are near-neutral to slightly basic. All soils become more basic with depth. Soil Eh and electrical conductivity values ranged from 300 to 450 mV and 100 to 375 ìS, respectively. Soil samples were digested according to EPA 3050B method and analyzed for heavy metals with ICP-AES. As, Cr, and Ni in soil increase from 4.6 to 11 mg/kg, 19 to 23 mg/kg, and 21 to 28 mg/kg respectively, from the surface to 50 cm depth, while Cu and Pb contents decrease from 27 to 17 mg/kg and 16 to 10 mg/kg, respectively. Surface enrichment of Cu and Pb are a result of aerosol deposition, while the downward increase in As, Cr, and Ni is related to pedogenic variation. The average concentration Zn in soils is 64 mg/kg, with no discernible aerosol deposition or land-use change variation or variation in vertical distribution. With the exception of As, land-use change differences in heavy metal content in soil are not significant. The concentration of As in the near-surface arable soil (6 mg/kg) is significantly higher than that of forest soil (4 mg/kg); however, deeper samples from both land-uses have similar As concentrations (8 mg/kg). The relative enrichment of As in surface arable soil could indicate input from herbicides or pesticides, or selective enhancement of As. The ion exchangeable fraction of metals is higher in the surface soils as indicated by higher EC. However, near neutral, organic, and clay rich soils would limit degree of mobility. Similarly, slightly acidic arable soil can have higher mobility of metals. The concentration of heavy metals and arsenic in these soils are much lower than the limits set by the USEPA and thus pose no risk.
Sheila Roberts (Advisor)
95 p.
Agricultural land; forest; hevy metals; arsenic; soil geochemistry

Recommended Citations

Citations

  • Neupane, G. (2006). QUANTITATIVE COMPARISON OF HEAVY METALS AND METALOIDS IN AGRICULTURAL AND FOREST SOILS IN BOWLING GREEN, OHIO [Master's thesis, Bowling Green State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1147699490

    APA Style (7th edition)

  • Neupane, Ghanashyam. QUANTITATIVE COMPARISON OF HEAVY METALS AND METALOIDS IN AGRICULTURAL AND FOREST SOILS IN BOWLING GREEN, OHIO. 2006. Bowling Green State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1147699490.

    MLA Style (8th edition)

  • Neupane, Ghanashyam. "QUANTITATIVE COMPARISON OF HEAVY METALS AND METALOIDS IN AGRICULTURAL AND FOREST SOILS IN BOWLING GREEN, OHIO." Master's thesis, Bowling Green State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1147699490

    Chicago Manual of Style (17th edition)

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© 2006, all rights reserved.
This open access ETD is published by Bowling Green State University and OhioLINK.