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Microbial formation of volatile arsenic in cattle dip site soils contaminated with arsenic and DDT
- Source :
- Applied Soil Ecology. 25:207-217
- Publication Year :
- 2004
- Publisher :
- Elsevier BV, 2004.
-
Abstract
- This study was conducted to assess whether the addition of exogenous nutrients and bioaugmentation by arsenic (As) methylating fungi could accelerate the rate of As volatilisation in cattle dip soils containing mixed As and DDT contamination. Increasing levels of manure application resulted in a greater loss of As from contaminated soils [30% (w/w) > 15% (w/w) > 5% (w/w) manure]. Loss of As was more pronounced at 75% of field capacity than at 35% of field capacity. The supplement of 30% (w/w) manure at 75% field capacity exerted the greatest reduction of As (8.3% loss of total As) in a contaminated dip soil containing 1390 mg As kg −1 and 194 mg DDT kg −1 over a 5-month incubation. The rates of As loss and microbial respiration (CO 2 production) were correlated with the levels of manure amendment ( P ≤0.05). Augmentation by As methylating fungi ( Penicillium sp. and Ulocladium sp.) was able to enhance arsine evolution rates in field contaminated soils and in freshly spiked soils. The amounts of arsine dissipated in augmented long-term contaminated soils and soils spiked with As alone were 3.7 and 8.3 orders of magnitude greater than uninoculated soils, respectively. DDT appears to inhibit the rates of microbial formation of arsine in the contaminated dip soils.
- Subjects :
- cattle dip site soils
Bioaugmentation
Volatilisation
Ecology
Chemistry
arsenic
Amendment
Soil Science
chemistry.chemical_element
biomethylation
Agricultural and Biological Sciences (miscellaneous)
Manure
Soil contamination
ddt
Field capacity
Environmental chemistry
Soil water
fungi
bioaugmentation
Arsenic
Subjects
Details
- ISSN :
- 09291393
- Volume :
- 25
- Database :
- OpenAIRE
- Journal :
- Applied Soil Ecology
- Accession number :
- edsair.doi.dedup.....2127c612db55d9a5990a0415ed0d39c5