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Heavy metal and colloid mobility in ...

Dong, Yan.

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Heavy metal and colloid mobility in soils.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Heavy metal and colloid mobility in soils./
Author:	Dong, Yan.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1999,
Description:	151 p.
Notes:	Source: Dissertation Abstracts International, Volume: 60-12, Section: B, page: 5999.
Contained By:	Dissertation Abstracts International60-12B.
Subject:	Environmental science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9956568
ISBN:	9780599597181

Heavy metal and colloid mobility in soils.
Dong, Yan.

Heavy metal and colloid mobility in soils. - Ann Arbor : ProQuest Dissertations & Theses, 1999 - 151 p.

Source: Dissertation Abstracts International, Volume: 60-12, Section: B, page: 5999.

Thesis (Ph.D.)--University of Florida, 1999.

Mobility of heavy metals in soils is of environmental significance due to their toxicity. to both humans and animals. In general, heavy metal mobility is low because of its low solubility. However, enhanced heavy metal mobility has been reported under both laboratory and field conditions. It has been attributed to enhanced solubility of heavy metals and colloid-facilitated metal transport.

ISBN: 9780599597181Subjects--Topical Terms:

677245
Environmental science.

Heavy metal and colloid mobility in soils.
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035 $a (MiAaPQ)AAI9956568
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100 1 $a Dong, Yan. $3 3287603
245 1 0 $a Heavy metal and colloid mobility in soils.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1999
300 $a 151 p.
500 $a Source: Dissertation Abstracts International, Volume: 60-12, Section: B, page: 5999.
500 $a Chair: Lena Q. Ma.
502 $a Thesis (Ph.D.)--University of Florida, 1999.
520 $a Mobility of heavy metals in soils is of environmental significance due to their toxicity. to both humans and animals. In general, heavy metal mobility is low because of its low solubility. However, enhanced heavy metal mobility has been reported under both laboratory and field conditions. It has been attributed to enhanced solubility of heavy metals and colloid-facilitated metal transport.
520 $a In this study, the solubility and mobility of heavy metals were examined in a Pb-spiked sandy soil and two Pb-contaminated soils. For the Pb-spiked soil, water-flooded and non-water-flooded incubations were used to alter soil solution chemistry in soil columns, which were then leached with de-ionized water. It was found that Pb concentrations in leachates were related to the ratios of Fe concentration in the leachates to Fe concentrations extracted with HCl. Enhanced Pb mobility occurred only when the Fe ratios were lower than a threshold value for a given soil. The two Pb-contaminated soils were incubated for different times under water flooded condition to alter their redox status. Metal solubility was examined by analyzing the pore water of the incubated soil columns whereas metal mobility was examined by leaching the columns with 0.01 M CaCl2. The data showed that metal solubility in pore water and metal mobility in CaCl2 solution were not always directly related. There has been sufficient evidence that a reduction in cation exchange capacity (CEC) occurs with Fe reduction dissolution. However, the consequent redistribution of metals between solution and exchange phases with incubation was determined not only by the magnitude of CEC, but also the characteristics of metal ions, the competing co-ions and counterions (ligands).
520 $a Colloid mobility in the two Pb-contaminated soils was examined by switching the influent from 0.01 M CaCl2 to de-ionized water. In addition, a batch dispersability test was conducted by dispersing the incubated soils in 0.01 M CaCl2 and 0.06 M CaCl2, and then a relative stability ratio (W) of an incubated soil was estimated from the absorbency-time curves of a dispersion in the solutions. The results showed that colloid mobility is greatly influenced by incubation and that colloidal metal mobility is enhanced when exchangeble Ca is easily replaced.
590 $a School code: 0070.
650 4 $a Environmental science. $3 677245
690 $a 0768
710 2 $a University of Florida. $3 718949
773 0 $t Dissertation Abstracts International $g 60-12B.
790 $a 0070
791 $a Ph.D.
792 $a 1999
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9956568