Manganese contamination in soils and plants as related to traffic volume
Methylcyclopentadienyl Manganese Tricarbonyl (MMT) is an organic derivative of manganese that is used as an additive in unleaded gasoline, mostly in Canada. Its use is suspected to lead to manganese (Mn) contamination, particularly in the urban ecosystems where traffic density is often high. This study has been conducted in order to measure and compare the Mn levels in soils and plants and to assess the bioaccumulation and toxic effects in plants as they relate to both traffic volume (starting from an actual traffic volume of 150,000 vehicles/day to a hypothetical level of 1,000,000 vehicles/day) and distance from highway (within 10 meters). Oat and bean plants were planted in organic soil in a controlled growth chamber. Three groups from both plants were exposed to three different predetermined quantities of manganese tetra oxides (Mn{sub 3}O{sub 4}) that were theoretically estimated as corresponding to the level of emissions from light vehicles. Exchangeable and total Mn were measured in the soils before and after the exposure period. After the growth period, total Mn was measured in the different parts of controlled and exposed plants. There were no visible Mn toxicity symptoms and the tissue levels of both plants did not exceed toxic threshold concentrations. However, the analyses indicate a parallel increase of exchangeable Mn concentration in soil and total Mn in plants. This may suggest that the increase in traffic volume will result in an increase of exchangeable Mn in the soils and total Mn in plants near the emission source. These results demonstrate that bean and oat plants could be useful as bioindicators of Mn deposition at a local scale and may help to assess the Mn contribution to the foodchain. Furthermore, the results could be used to validate environmental fate models.
- OSTI ID:
- 37454
- Report Number(s):
- CONF-9410273-; TRN: IM9519%%378
- Resource Relation:
- Conference: 15. annual meeting of the Society of Environmental Toxicology and Chemistry (SETAC), Denver, CO (United States), 30 Oct - 3 Nov 1994; Other Information: PBD: 1994; Related Information: Is Part Of Society of Environmental Toxicology and Chemistry 15th annual meeting: Abstract book. Ecological risk: Science, policy, law, and perception; PB: 286 p.
- Country of Publication:
- United States
- Language:
- English
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