作者：Yang, LQ (Yang, Lanqin); Liu, BL (Liu, Benle) ; Lu, YY (Lu, Yuanyuan) ; Lu, FY (Lu, Fangyi) ; Wu, XY (Wu, Xiangyang); You, WH (You, Wenhua) ; Huang, B (Huang, Biao) 

题目：Bioavailability of cadmium to celery (Apium graveolens L.) grown in acidic and Cd-contaminated greenhouse soil as affected by the application of hydroxyapatite with different particle sizes

刊物：CHEMOSPHERE，卷: 240，文献号: UNSP 124916

DOI: 10.1016/j.chemosphere.2019.124916

出版年: FEB 2020

摘要：

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.