Essential and nonessential heavy metals like iron (Fe), nickel (Ni), manganese (Mn), zinc (Zn), copper (Cu), cadmium (Cd), chromium (Cr), and lead (Pb) were analyzed in four selected medicinal plants such as <i>Capparis spinosa, Peganum harmala, Rhazya stricta,</i> and <i>Tamarix articulata</i> by flame atomic absorption spectrophotometer (FAAS). These medicinal plants are extensively used as
The total concentrations of Cu, Pb and Zn and their bioavailability were studied in forest soil and vegetative communities (grass and wild strawberries) collected from two areas (A and B). Two single extraction methods were used for the evaluation of the availability of Cu, Pb and Zn in forest soils. The total metal concentrations ranged from 27.43 to 143.34 mg/kg for Zn, 49.82 to 95.84 mg/kg
In addition, Cu, Pb, and Zn concentrations in soil in the study area are compared with the background values of Cu (21.50 mg/kg), Pb (19.10 mg/kg), and Zn (56.30 mg/kg) for soils in Ningxia, suggesting minimal anthropogenic impacts on soil metal status (Pichtel et al. 1997, Tao and Liu 2000). Álvarez et al. stated that highly increased levels
A strong positive correlation was found among wastewater and crops toxic metals (r2 values in Cu, Zn, Pb, Ni and Cr were 0.913, 0.804, 0.752, 0.694, 0.587 respectively).
In our study, the P value of F test of model for Zn, Ni, Pb and Cu were all more than 0.05, and the P value of ttest were all more than 0.05, too. The results indicated that the concentration of Zn, Ni, Pb and Cu in soil had no significant influence on their accumulation in tea leaves.
The Cd, Cu, Pb and Zn content of the organic fraction >1 mm is in the same range as the natural background content of heavy metals in indoor and outdoor organic matter ( Table 5 ). The organic material within the size range 0.051 mm most probably originates from the