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| Effects of Chemical Stabilization on Soil Cd Fractions and Water Spinach Cd Contents After Amendment with Dredged River Sediments |
| Received:August 27, 2014 |
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| KeyWord:sediment utilization;cadmium;stabilization;chemical fractionation;water spinach |
| Author Name | Affiliation | E-mail | | LI Xiang | Environmental Protection Research Institute of Light Industry, Beijing 100089, China | | | LIU Yong-bing | Environmental Protection Research Institute of Light Industry, Beijing 100089, China | liuyongbing21@163.com | | CHENG Yan-jun | Environmental Protection Research Institute of Light Industry, Beijing 100089, China | | | LUO Nan | Environmental Protection Research Institute of Light Industry, Beijing 100089, China | | | ZANG Zhen-yuan | Environmental Protection Research Institute of Light Industry, Beijing 100089, China | | | WU Jun | Haikou City Major Land Arrangement Project Leading Group, Haikou 570312, China | | | HONG Wen-liang | Haikou City Major Land Arrangement Project Leading Group, Haikou 570312, China | | | SHEN Lai-xin | Beijing Institute of Water, Beijing 100048, China | |
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| Abstract: |
| In situ stabilization is a low-cost, simple-operation and fast-effectiveness technique for remediating heavy metals-contaminated soils. In this study, a field trial was carried out to investigate the stabilization effects of three different amendment treatments(lime + calcium magnesium phosphate fertilizer, sepiolite+calcium dihydrogen phosphate, and calcium magnesium phosphate fertilizer alone) on soil Cd forms and bioavailability. The effectiveness of the treatments was evaluated by soil Cd fractions and Cd contents in water spinach. Results showed that amendments changed Cd fractions in treated soil. Compared with the control, the maximum reduction of acid extractable Cd fraction was 54.43%, while the increase percentages were as high as 81.90% for reducible fraction, 107.43% for oxidizable fraction, and 74.15% for residual fraction. Water spinach Cd contents were 38.61% to 85.69% lower in the stabilization treatments than in control, meeting the safety requirements for non-pollution vegetables. For all Cd levels, the reducing effect of stabilizers on water spinach Cd content was lime+calcium magnesium phosphate fertilizer > calcium magnesium phosphate fertilizer > sepiolite+calcium dihydrogen phosphate, which was consistent with acid extractable Cd in soil. In conclusion, soil amendments could effectively control the Cd pollution caused by sediment applications, ensuring the food safety of water spinach produce. |
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