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Redox chemistry of chromium-contamin...

Szulczewski, Melanie D.

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Redox chemistry of chromium-contaminated soils.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Redox chemistry of chromium-contaminated soils./
作者:	Szulczewski, Melanie D.
面頁冊數:	144 p.
附註:	Source: Dissertation Abstracts International, Volume: 61-02, Section: B, page: 0623.
Contained By:	Dissertation Abstracts International61-02B.
標題:	Agriculture, Soil Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9956183
ISBN:	0599642378

Redox chemistry of chromium-contaminated soils.
Szulczewski, Melanie D.

Redox chemistry of chromium-contaminated soils. - 144 p.

Source: Dissertation Abstracts International, Volume: 61-02, Section: B, page: 0623.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 1999.

This research included these objectives: (1) to examine the effects of chromium redox couples with manganese, iron, and sulfur on Cr speciation in chromium-contaminated soils; (2) to conduct a long-term experiment of the effects of time, pH, level of contamination, and additions of the reducing agent Fe(II) and oxidizing agent delta-MnO2 on Cr redox reactions; (3) to evaluate the reducing capacity of thiol(R-SH)-containing organic compounds on Cr(VI)-contaminated soils with sulfur and chromium x-ray absorption near-edge structure (XANES) spectroscopy; and (4) to characterize the participation of reduced sulfur groups in humic substances in the reduction of Cr(VI).

ISBN: 0599642378Subjects--Topical Terms:

1017824
Agriculture, Soil Science.

Redox chemistry of chromium-contaminated soils.
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245 1 0 $a Redox chemistry of chromium-contaminated soils.
300 $a 144 p.
500 $a Source: Dissertation Abstracts International, Volume: 61-02, Section: B, page: 0623.
500 $a Supervisors: William F. Bleam; Philip A. Helmke.
502 $a Thesis (Ph.D.)--The University of Wisconsin - Madison, 1999.
520 $a This research included these objectives: (1) to examine the effects of chromium redox couples with manganese, iron, and sulfur on Cr speciation in chromium-contaminated soils; (2) to conduct a long-term experiment of the effects of time, pH, level of contamination, and additions of the reducing agent Fe(II) and oxidizing agent delta-MnO2 on Cr redox reactions; (3) to evaluate the reducing capacity of thiol(R-SH)-containing organic compounds on Cr(VI)-contaminated soils with sulfur and chromium x-ray absorption near-edge structure (XANES) spectroscopy; and (4) to characterize the participation of reduced sulfur groups in humic substances in the reduction of Cr(VI).
520 $a The Fe(II) reducing agent stoichiometrically reduced the Cr(VI) present in all the soil samples which received it: neutral (pH = 7.30) and acidic (pH = 5.00), low (14 mmol Cr(VI) per kg soil) and high (140 mmol kg --1) levels of Cr(VI) contamination. The Cr(III) remained in its reduced state for the duration of the 580-day experiment. The Mn(IV) oxidizing agent did not produce as noticeable an effect, but some slight, highly variable re-oxidation of Cr(III) to Cr(VI) did occur immediately after its addition. Oxidation was not significantly greater in the more acidic soil samples, and did not increase as time passed. Because of the small amounts of Cr(III) that were re-oxidized in these somewhat idealized laboratory conditions, it appears that the overall potential for re-oxidation in a soil-water system is low.
520 $a Analysis with sulfur XANES spectroscopy monitored the behavior of S-containing functional groups during their interaction with Cr(VI). Thiol-containing compounds such as cysteine and glutathione were able to reduce Cr(VI) in solution, as well as Cr(VI) in laboratory- and industrially-contaminated soils. Sulfur and chromium XANES analysis also determined that thiol functional groups in humic acids participate in the reduction of Cr(VI) to Cr(III). This is the first study to show direct evidence (from XANES spectroscopic analysis) of changes in a suspected reducing agent in organic matter during its reduction of Cr(VI) In addition, we were able to conclude that disulfides, are a principle contributor to the second gaussian peak in the S K-edge XANES spectrum, which represents formal oxidation state S0.
590 $a School code: 0262.
650 4 $a Agriculture, Soil Science. $3 1017824
650 4 $a Environmental Sciences. $3 676987
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710 2 0 $a The University of Wisconsin - Madison. $3 626640
773 0 $t Dissertation Abstracts International $g 61-02B.
790 1 0 $a Bleam, William F., $e advisor
790 1 0 $a Helmke, Philip A., $e advisor
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792 $a 1999
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