Total concentrations and speciation of heavy metals in soils of the Shenyang Zhangshi Irrigation Area, China

Abstract

The Shenyang Zhangshi Irrigation Area (SZIA) was used for the spreading of municipal and industrial waste water, which is an economic way of irrigating crops, recycling nutrients and water treatment. Long-term irrigation resulted in a severe metal contamination of soils. To identify the soil phases implicated in retaining the metals, sequential extractions were performed. The most predominant metal was cadmium which was mainly associated with mobile, easily soluble and easily reducible fractions. Copper was mainly associated with the residual, EDTA extractable and moderately reducible fractions. Lead was bound to organic matter and poorly crystalline Fe-oxides. Nickel and zinc were mainly associated with the residual and strongly reducible fractions. Although copper, lead, nickel and zinc concentrations were of minor importance mobile metal concentrations of these metals as well as of cadmium exceeded German trigger values for plant production and plant growth.

Total concentrations, fractionation and mobility of heavy metals in soils of urban area of Guwahati, India

“…The exchangeable fraction (F 1 ) of zinc is only 6%. This agrees with those reported by other workers (Bulletin 1 Aberdeen 1985; Huang et al 2007;Ratuzny et al 2009). Zn bound to the exchangeable fraction (F 1 ) is found to be negligible, with exception for sites 4, 12, 20, and 28 that have higher values.…”

Remediation of deltamethrin contaminated cotton fields: residual and adsorption assessment

“…This is in agreement with Zn associated [31][32]. The present study also shows a comparison of organic bound higher in sequence to exchangeable fraction with studies [27,33], as shown in Fig. 2(b).…”

Heavy metal concentration and speciation of seven representative municipal sludges from wastewater treatment plants in Northeast China

“…It was also noted that the majority of Cu was existent in the form of oxidizable and residual fractions, accounting for about 80-95.3% of the bulk Cu in all sludge samples. Specifically, the highest oxidizable Cu was obtained in S4 sample and accounted 70.7% of total Cu, being quite similar to the available reports (Ratuzny et al 2009). Traditionally, Cu-organic matter complexes showed the least mobile/stable characteristics, since the combination of the Cu with organic matter was highly dependent on the surrounding condition, e.g., pH, redox-potential, temperature, particularly the quantity of Fe oxides in soils (Silveira et al 2006;Tack and Verloo 1995).…”