NDLI: Effects of bacteria on metal bioavailability, speciation, and mobility in different metal mine soils: a column study

Content Provider	Springer Nature Link
Author	Li, Wai Chin Wong, Ming Hung
Copyright Year	2009
Abstract	Successful phytoremediation depends mainly on the bioavailability of heavy metals in the soil. Recently, soil microbes possess several mechanisms that are able to change metal bioavailability in the soil, which provides a new strategy for investigating biogeochemical cycling of metals in contaminated soils. Three metal mines soils with elevated concentrations of Cd, Pb, and Zn from China were applied in this column study to (1) evaluate the effects of metal tolerant bacterial inoculation (Burkholderia cepacia, accession number: AB051408) on metal release, (2) monitor the migration of metals in the rhizospheric horizon (0–20 cm), and (3) investigate metal speciation and sequential fractions in soil.All soils were air dried, crushed to pass through a 2-mm sieve and then autoclaved at 121°C for 2 h. The control soil was then mixed with different metal polluted soils, respectively, at four percentages (w/w), prior to being packed into polyvinyl chloride (PVC) columns. Four PVC columns were added with B. cepacia peat-based inocula, and the final concentration of the bacteria is 3.0 × 10$^{8}$ cell/g soil. The other four columns received the same amount of the autoclaved peat-based inocula (without bacteria) in order to keep the soil texture and other properties similar. The columns were applied with 80 mL deionized water daily for 12 weeks. At the end of the experiment, the soil samples from two horizons (0–10 and 10–20 cm) were collected for physico-chemical and metal speciation analyses.Results indicated that bacterial inoculation significantly enhanced the extractability of water-soluble Cd, Cu, and Zn (single-chemical extraction) in all metal mine soil treatments. However, inoculation of bacteria had a minor effect on As and Pb extractability. Increasing water-soluble and Olsen-P in soil solution induced by the presence of bacteria may contribute to the decrease of water-soluble Pb through sedimentation of Pb phosphate. Bacterial inoculation also increased the mobility of heavy metals (sequential chemical extraction). HOAc-soluble Cd and Zn increased as the pH value decreased since the metal adsorption on colloids weakened due to a decrease in pH-dependent negative charge. In addition, a significant increase in water-soluble N, P, NaHCO$_{3}$-extractable P, and soil acid phosphatase activity were observed.Based on the above results, it can be concluded that metal tolerant bacteria are efficient in increasing the bioavailability of Cd and Zn when expressed relative to the control treatment, which might be of great significance for the successful phytoextraction of metal polluted sites.
Starting Page	313
Ending Page	325
Page Count	13
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	10
Issue Number	2
e-ISSN	16147480
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-01-08
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Burkholderia cepacia Enzyme activity Metal speciation Single and sequential extraction Environmental Physics Environment Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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