Journal
CHEMOSPHERE
Volume 240, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2019.124916
Keywords
Hydroxyapatite; Particle size; Bioavailability; Cadmium; Celery
Categories
Funding
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [17KJB210003]
- Zhenjiang Science & Technology Program [SH2017045]
- Jiangsu University [15JDG029]
- National Natural Science Foundation of China [31770394]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment
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Cadmium contamination in greenhouse vegetable fields greatly limited the sustainable production especially of leafy vegetables. Hydroxyapatite (HAP), as a common soil amendment, has been widely used in the remediation of Cd-contaminated soils, while its remediation efficiency greatly depends on its particle sizes. In this study, a rhizobag pot experiment was conducted to investigate the effects of HAP (<60 nm, <12 mu m and <80 mu m) on bioavailability of Cd to celery grown in acidic and slightly Cd-contaminated greenhouse soil. The results suggested that HAP with the largest particle size (<80 mu m) had the best effectiveness in reducing Cd uptake especially by the edible part of celery. Specifically, the increase in HAP (<80 mu m) addition from 0.5% to 3% prominently reduced Cd concentrations in celery shoot by 19.6%-76.8% as compared with the untreated group. Also, adding HAP (<80 mu m) especially at 3% significantly decreased translocation factor (TF) of Cd from celery root to shoot by 30.6% and reduced bioconcentration factor (BCF) of Cd from rhizosphere soil to celery shoot by 76.4%. These were predominantly associated with the significantly increased soil pH and the subsequently decreased soil CaCl2 Cd concentration after adding HAP (<80 mu m). Overall, although rhizosphere soil pH was the key factor in controlling Cd uptake by edible celery and regulating BCF and TF of Cd, insignificant root-induced acidification had limited effect on the immobilization efficiency of Cd by HAP (<80 mu m). In conclusion, HAP (<80 mu m) has good potential for the remediation of Cd-contaminated greenhouse soils. (C) 2019 Elsevier Ltd. All rights reserved.
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