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| Effects of stabilization on soil heavy metal fractions and vegetable heavy metal content under amendment with dredged river sediments |
| Received:December 09, 2015 |
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| KeyWord:sediment utilization;soil heavy metal;stabilization;vegetable;accumulation |
| Author Name | Affiliation | E-mail | | LI Xiang | Beijing Key Lab of Industrial Contamination and Remediation, Environmental Protection Research Institute of Light Industry, Beijing 100089, China | | | LIU Yong-bing | Beijing Key Lab of Industrial Contamination and Remediation, Environmental Protection Research Institute of Light Industry, Beijing 100089, China | liuyongbing21@163.com | | CHENG Yan-jun | Beijing Key Lab of Industrial Contamination and Remediation, Environmental Protection Research Institute of Light Industry, Beijing 100089, China | | | ZANG Zhen-yuan | Beijing Key Lab of Industrial Contamination and Remediation, Environmental Protection Research Institute of Light Industry, Beijing 100089, China | | | LUO Nan | Beijing Key Lab of Industrial Contamination and Remediation, Environmental Protection Research Institute of Light Industry, Beijing 100089, China | | | WANG Jia-jia | Beijing Key Lab of Industrial Contamination and Remediation, Environmental Protection Research Institute of Light Industry, Beijing 100089, China | |
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| Abstract: |
| A field experiment was carried out to investigate the effects of stabilization on heavy metal fractions in soil and heavy metal con tent in four different vegetables under agricultural applications of dredged river sediments. Results showed that all stabilization treatments reduced heavy metal content in vegetables by diminishing mobility and bioavailability of heavy metals in soils. Compared with the control, Cd, Pb, Cu, Ni, and Zn in acid extractable fraction were apparently reduced in the treated soil, with the maximal reduction rates of 40.95% for Cd, 83.87% for Pb, 67.22% for Cu, 65.32% for Ni, and 71.61% for Zn. The most effective treatment for soil Cd was LP (lime+calcium magnesium phosphate fertilizer), while the best for all other heavy metals was MP (calcium magnesium phosphate fertilizer). The maximal reduction of heavy metals in the edible parts of vegetables was 85.69% for Cd, 100.00% for Pb, 77.91% for Cu, 64.97% for Ni, and 70.93% for Zn. The content of all heavy metals in the plants met the national food safety standards (GB 2762-2012). LP showed the most effectiveness to reduce Cd uptake by water spinach, whereas three treatments did not show difference in reducing heavy metal uptake by balsam pear, bell pepper and carob. Bioaccumulation factors of water spinach for heavy metals were greater than those of bell pepper, bitter melon, and carob. In conclusion, soil stabilization amendments could effectively control the heavy metal pollution caused by sediment applications, ensuring the vegetable safety. In order to secure safe vegetable production, vegetables with different accumulation capacities should be selected for planting in slightly polluted or stabilized farmland soil based on the species, concentrations and bioavailability of soil heavy metals. |
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