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To investigate ecological risks and spatial distributions of heavy metals in atmospheric particles in the Beijing urban area, atmospheric dust was collected from 62 sites and 12 heavy metals in their <63 μm fractions were measured. Results indicate that V, Cr, Mn, Co, Ni, and Ba in the dust are basically unpolluted by human activities; whereas Cu, Zn, As, Cd, Sb, and Pb are moderately to heavily...
Flowback fluids from the hydraulic fracturing process that contain high levels of metals may pose environmental risks. This laboratory study investigated the remediation potential of Phragmites australis to sequester Ba and Sr from flowback liquids. The results indicated that reeds can uptake different concentrations of Ba and Sr from solutions. Roots were the main tissues for metal storage, with...
Limited information is available for how soil compaction affects carbon dioxide (CO2) efflux under different tillage systems. To improve understanding of the effects of compaction and tillage on soil CO2 efflux, an incubation study consisting of no tillage (NT), moldboard plow (MP), and ridge tillage (RT) was conducted to explore the relationships between CO2 efflux and bulk density, as well as pore...
What is the relationship with environmental factors of phytoplankton community dynamics in saline lakes? We analyzed a data set of phytoplankton community and environmental parameters in seasonal periods (i.e., summer and autumn) in order to describe seasonal variations within the phytoplankton community and its relationship with environmental variables in Chagan Nur Lake on the Ordos Plateau in China...
In situ stabilization of cadmium (Cd) in soil by the addition of Fe-rich amendments (e.g., red mud or RM) has been suggested as an effective and low-cost method. A combined soil-sand pot experiment was conducted to investigate the influence of the addition of RM on iron plaque formation and Cd accumulation in rice plants. Two experiments were conducted: 1. A hydroponic trial with 20 cultivars for...
An entropy-cloud model is proposed to deal with soil heavy metal pollution assessment based on entropy and cloud model theory. Parameters of the cloud model of each heavy metal level are calculated with the chosen indicators, and hybrid entropy weights are determined based on Shannon entropy and the analytic hierarchy process (AHP) to generate an entropy-cloud model of all indicators. Certainty degrees...
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