Bioaccessibility of heavy metals in soils cannot be predicted by a single model in two adjacent areas.

摘要: The objective of this study was to examine whether a single model could be used predict the bioaccessibility heavy metals in soils two adjacent areas and determine feasibility using existing data sets total metal concentrations soil property parameters (e.g., pH, organic carbon, texture) when predicting bioaccessibility. A 103 topsoil samples were collected from (Baotou Bayan Obo). 76 Baotou, 27 Obo. bioaccessible arsenic (As), copper (Cu), lead (Pb), zinc (Zn) measured following complete composite acid digestion simple extraction test. average As, Cu, Pb, Zn 8.95, 27.53, 28.40, 79.50 mg/kg, respectively, Baotou 18.12, 30.75, 38.09, 87.62 mg/kg Except for these values similar both areas. (Bio-HMs) each target HM also similar. In Bio-HM 1.16, 3.76, 16.31, 16.10 mg/kg, 1.26, 2.51, 14.31, 8.68 mg/kg However, relative bioaccessibilities greater than those Obo, with mean Zn, As 57, 20, 17, 12 %, 40, 11, 9, 8 % areas, prediction models successfully created physicochemical parameters; however, same element differed between which indicated that common sites does not exist. Bio-HMs highly affected by properties, found differ addition, properties large variations played major roles predictive models. This highlights importance incorporating physical chemical vary greatly building soil. similarity might prerequisite creation Bio-HMs.