Effects of calcium peroxide on arsenic uptake by celery (Apium graveolens L.) grown in arsenic contaminated soil

Arsenic availability in rice from a mining area: Is amorphous iron oxide-bound arsenic a source or sink?

“…2), but no significant correlation was observed between the concentrations of As in any parts of rice and those in F4, F5 or total As (Table S4). Accordingly, fractions of As in F3, F4 and F5 appear to be unavailable to rice in our present study, which is similar to the findings within previous studies (Tang et al, 2007;Du et al, 2008;Liu et al, 2012).…”

“…Tang et al (2007) and Niazi et al (2011) also reported that the bioavailability of As was significantly correlated with the concentrations of non-specifically adsorbed As (F1) or specifically adsorbed As (F2). Therefore, fractions of As in F1 and F2 could be considered as available portions of As to plants in soils (Vazquez et al, 2008;Liu et al, 2012). The concentrations of As in F3, F4, and F5 ranged between 3.92 and 59.9, 4.48e59.5, and 1.40e88.8 mg kg À1 , respectively, accounting for 27.7%, 25.1%, and 30.9% of the total As content (Table S3).…”

“…Generally, the As fraction bound to amorphous iron oxides (F3) is an important portion of As in soils, and thus its availability is an important factor affecting the bioavailability of As in rice (Tang et al, 2007). Compared to exchangeable and carbonate-bound As fractions, As fraction F3 has been considered to be more tightly retained and less labile by some previous studies because of its sequestration by soil oxides (Tang et al, 2007;Du et al, 2008;Liu et al, 2012). However, conflicting results have been reported (Hsu et al, 2012), where it was found that contents of As in F3 were positively correlated with those in rice.…”

Efficiency of Repeated Phytoextraction of Cadmium and Zinc from an Agricultural Soil Contaminated with Sewage Sludge

“…The remediation plant species were Sedum plumbizincicola, a Cd and Zn hyperaccumulator (Wu et al 2006) which was selected because of its excellent performance in previous remediation studies (Zhao et al 2011;Liu et al 2012;Ma et al 2012;Nai et al 2013). Seeds of S. plumbizincicola were sown in trays with a matrix of vermiculite and a layer of perlite on the surface using Hoagland's nutrient solution (Ma et al 2013).…”

“…Use of phytoremediation alone can be time-consuming but it might be possible to enhance the remediation efficiency by intercropping with other remediation plant species (Llugany et al 2012;Ma et al 2012;Gupta et al 2013). Celery has been found to be a highly tolerant vegetable to some heavy metals such as Hg, Cd, Zn and Pb and its ability to remediate soil contaminated with both Cd and Zn has been observed and employed for several years in our laboratory Liu et al 2012;Liu et al 2013;Nai et al 2013).…”