摘要
选择苏南某镉(Cd)污染稻田,研究钙镁磷肥和钙铝水滑石2种钝化修复材料对Cd污染土壤原位钝化修复的效果,并且探讨含磷钝化剂的使用对水土环境磷累积与迁移特征的影响.结果表明:施用2种钝化剂后均能有效降低土壤中有效态Cd的含量,且随着钝化时间的推移,有效态Cd含量均呈现稳定缓慢降低的趋势,在施加钝化剂16周后达到最低,不同处理的钝化效果依次为:1500kg/hm^(2)钙镁磷肥>6000kg/hm^(2)钙铝水滑石>750kg/hm^(2)钙镁磷肥,各处理有效态Cd比施加前分别降低了54.5%、50.3%以及46.9%.各处理在不同阶段的土壤pH值与有效态Cd含量呈显著负相关.施用钙镁磷肥作为钝化剂会加快土壤中磷的累积,且随着施用量的增加60~90cm深度渗漏水中总磷和溶解性磷酸盐含量有明显升高趋势.
Two amendments,calcium-magnesium phosphate fertilizer(CaMgP)and calcium-aluminum hydrotalcite(CAH),were selected to immobilize cadmium(Cd)in a Cd-contaminated paddy field in the South Jiangsu Province.The Cd-immobilization efficiency and the characteristics of phosphorus(P)accumulation and movement in water-soil environment caused by using P-containing amendments were studied.The results showed that the application of two amendments both effectively reduced the availability of Cd in the soil.The concentrations of available Cd in all treatments slowly decreased over time and reached the lowest level at the time of 16 weeks from amendments application.Compared to the initial soils,the immobilization efficiency of Cd for different treatments were sorted in descending order as 1500kg/hm^(2) CaMgP(54.5%)>6000kg/hm^(2)CAH(50.3%)>750kg/hm^(2) CaMgP(46.9%).A significant and negative relationship between soil pH and available Cd at different stages of treatments was also found.The application of CaMgP as an amendment accelerated the accumulation of P in the soil.In addition,the total P and soluble P concentrations in the leakage water at 60~90cm depth tended to increase significantly with the increasing of CaMgP application.
作者
姚臻晖
涂理达
周慧平
胡鹏杰
王甜甜
郑家俊
YAO Zhen-hui;TU Li-da;ZHOU Hui-ping;HU Peng-jie;WANG Tian-tian;ZHENG Jia-jun(College of Environmental and Safety Engineering,Changzhou University,Changzhou 213011,China;Nanjing Institute of Environmental Sciences,Ministry of Ecology and Environment of the People’s Republic of China,Nanjing 210042,China;Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2021年第5期2374-2379,共6页
China Environmental Science
基金
国家重点研发计划(2016YFD0801106,2016YFD0801104)。
关键词
镉
稻田土壤
原位修复
钝化剂
含磷物质
cadmium
paddy soil
in situ remediation
amendments
phosphorus-containing materials
