Distribution and ecological risk assessment of 7 heavy metals in urban forest soils in Changsha City

Abstract

In order to understand the influence of urbanization on distribution of heavy metals in soils, concentrations characteristics of 7 heavy metals (Zn, Cu, Ni, Pb, As, Cd, and Hg) in various forest types were investigated along an urban gradient in Changsha, a capital city of Hunan Province, China. The concentrations and potential ecological risk of heavy metals in the urban soils was assessed when compared to the background values of heavy metals in soils in both Changsha city and Hunan Province. A total nineteen major forest types were selected at three locations (namely urban district location, urban fringe location, and suburban location) along the urban gradient degree in urban forests soil in the Changsha city. Two forest plots (each with the size of 20m 伊 20m) were built in each forest types. Three subplots were (each with an area of 1 m 2) were set up in each of the plots. Five soil samples (from 0-20 cm depth) were randomly taken within each subplot and pooled to a soil sample for heavy metals chemical analysis, 0-20cm soil samples were collected from different urban gradient (urban district, urban fringe, suburban) forest to analyze the concentrations of Zn, Cu, Ni, Pb, As, Cd, and Hg, and the potential ecological hazard assessment indices by Hakanson was used to assess the

Adsorption characteristics of Penicillium amphipolaria XK11 to cadmium and antimony

“…In collected tailings soil samples, the content of Cd reached 64.3 ± 5.5 mg kg − 1 , it is the 869 times more than soil background value in Hunan. Where the Sb reached up to 11,753.0 ± 176.1 mg kg − 1 (Li 2020), which pollution content exceeded the background value of Hunan soil 10685 times (Fang et al 2012). The collected samples were ltrated by a 100-mesh sieve after mixing evenly, loaded in a 50 ml centrifugal tube, and stored at 4 ℃.…”