Notice of RetractionCombined effect of lead and benzo(a)pyrene on dehydrogenase activity in soil

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.

Interactions between lead (Pb) and benzo(a)pyrene (Bap)toward soil dehydrogenase activity (dha) in rhizosphere soils of ryegrass and non-rhizosphere soils were studied after 2, 4, and 8 weeks of exposure under controlled conditions. The experimental approach was based on a uniform design. Six different contamination conditions were studied simultaneously, with 6 concentration levels for each pollutant. Data treatment was essentially based on the multiple regression technique. The results showed that significant synergistic interactions between Pb and Bap were observed at the end of 2 weeks. The dha correlated well with Pb concentrations at the end of 4 weeks. After 8 weeks, the dha in soils were governed by an unknown mechanism. This study indicated that the combined effect of Pb and Bap on soil dha depends largely on the incubation time. This phenomenon should be attributed to the changed bioavailability of pollutants during incubation as well as tolerance of bacterial to pollutants. Planting ryegrass could have more significant stimulatory effect on dha than pollutants. The enhancement of dha by ryegrass was considered to be even in all treatments.