Chemical Fraction of Heavy Metals in an Oasis Soil and Their Bioavailability to Cole Crops

Wang, Xia; Zhang, Nan; Ding, Wei; Wang, Shengli; Wang, Zhaowei; Yue, Yang; Wang, Bing

doi:10.1080/15324982.2012.656177

Cited by 7 publications

(1 citation statement)

References 25 publications

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“…The mobility of heavy metals, their bioavailability and related eco-toxicity to plant, depend strongly on their specific chemical fractions (Chen et al 2014 ; Wang et al 2012 ). Application of amendment can change the chemical fractions of heavy metals in soil and reduce their toxicity (Mackie et al 2015 ; Montenegro et al 2015 ; Rodriguez-Vila et al 2015 ).…”

Section: Resultsmentioning

confidence: 99%

Remediation of copper contaminated soil by using different particle sizes of apatite: a field experiment

Xing

Cang

et al. 2016

SpringerPlus

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The particle size of apatite is one of the critical factors that influence the adsorption of heavy metals on apatite in the remediation of heavy metal contaminated soils using apatite. However, little research has been done evaluating the impact of different particle sizes of apatite on immobilization remediation of heavy metal polluted soils in field. In this study, the adsorption isothermal experiments of copper on three kinds of apatite was tested, and the field experiment by using different particle sizes apatite [nano-hydroxyapatite (NAP), micro-hydroxyapatite (MAP), ordinary particle apatite (OAP)] at a same dosage of 25.8 t/ha (1.16 %, W/W) was also conducted. Ryegrass was chosen as the test plant. The ryegrass biomass, the copper contents in ryegrass and the copper fractionations in soil were determined after field experiments. Results of adsorption experiments showed that the adsorption amounts of copper on OAP was the lowest among different particles. The adsorption amounts of copper on MAP was higher than NAP at high copper equilibrium concentration (>1 mmol L−1), an opposite trend was obtained at low copper concentration (<1 mmol L−1). In the field experiment, we found that the application of different apatites could effectively increase the soil pH, decrease the available copper concentration in soil, provide more nutrient phosphate and promote the growth of ryegrass. The ryegrass biomass and the copper accumulation in ryegrass were the highest in MAP among all treatments. The effective order of apatite in phytoremediation of copper contaminated field soil was MAP > NAP > OAP, which was attributed to the high adsorption capacity of copper and the strong releasing of phosphate by MAP.

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