文章摘要
三聚磷酸钠与柠檬酸复合强化蜈蚣草修复砷污染土壤
Effect of the composite of sodium tripolyphosphate and citric acid on arsenic bioaccumulation from arsenic-contaminated soil by Pteris vittata L.
投稿时间:2019-05-30  修订日期:2019-07-17
DOI:
中文关键词: 土壤    植物修复  三聚磷酸钠  柠檬酸  蜈蚣草
英文关键词: soil  arsenic  phytoremediation  sodium tripolyphosphate  citric acid  Pteris vittata L.
基金项目:国家重点研发计划(2017YFD0801303)
作者单位E-mail
向冬芳 华中农业大学资源与环境学院  
廖水姣 华中农业大学理学院 liaosj@mail.hzau.edu.cn 
涂书新 华中农业大学资源与环境学院  
张丽梅 华中农业大学资源与环境学院  
谢天 华中农业大学资源与环境学院  
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中文摘要:
      为研究化学活化剂三聚磷酸钠和柠檬酸配合施用对蜈蚣草萃取砷效率的影响,通过模拟实验,在含砷57.7 mg·kg-1的水稻土中,探究了单一活化剂(三聚磷酸钠0.75 g·kg-1土,柠檬酸0.75 g·kg-1土)和三聚磷酸钠和柠檬酸配合施用(三聚磷酸钠:柠檬酸=0.375 g·kg-1土: 0.375 g·kg-1土)对土壤有效态砷含量变化的影响;采用盆栽实验,探究了三聚磷酸钠和柠檬酸配合施用(三聚磷酸钠:柠檬酸=0.1875 g·kg-1土: 0.1875 g·kg-1土)对蜈蚣草地上部萃取土壤砷的影响。模拟实验结果表明,与单一活化剂相比,三聚磷酸钠和柠檬酸配合施用对土壤砷的活化效果更显著;盆栽实验结果表明,与对照组相比,三聚磷酸钠和柠檬酸配合施用可使蜈蚣草羽叶干重提高21.8%以上,砷萃取总量提高40.4%以上;根际土总砷含量下降,土壤脲酶和脱氢酶活性显著增加。表明在砷污染土壤施加三聚磷酸钠和柠檬酸,由于其提高了蜈蚣草植物干重和土壤有效态砷含量,羽叶萃取砷效率明显提高。
英文摘要:
      In order to study the effect of the composite of sodium tripolyphosphate and citric acid on arsenic bioaccumulation from As-contaminated soil by Pteris vittata L., the effect of single chemical activator sodium tripolyphosphate (0.75 g·kg-1 soil), citric acid (0.75 g·kg-1 soil), and the composite of sodium tripolyphosphate and citric acid (0.375 g·kg-1 soil sodium tripolyphosphate and 0.375 g·kg-1 soil citric acid) on the content of available As was studied by using a soil screening experiment in paddy soil containing 57.7 g·kg-1 arsenic; the effect of the composite of sodium tripolyphosphate and citric acid (0.1875 g·kg-1 soil sodium tripolyphosphate and 0.1875 g·kg-1 soil citric acid) on arsenic bioaccumulation by pot experiment of Pteris vittata L. was studied in paddy soil containing 57.7 g·kg-1 arsenic. The results showed that the activation effect of the composite of sodium tripolyphosphate and citric acid on soil arsenic was more significant than that of the single chemical activator, and compared with the control, the dry weight of pinnae and the total amount of arsenic extraction were increased by more than 21.8% and 40.4%, respectively, by the application of the composite of sodium tripolyphosphate and citric acid. And in the rhizosphere soil of the pot experiment, the total arsenic content decreased, the activities of urease and dehydrogenase increased significantly, compared with the control. These results suggest that the arsenic bioaccumulation effect from As-contaminated soil by Pteris vittata L. increase significantly by applying the composite of sodium tripolyphosphate and citric acid (sodium tripolyphosphate and citric acid). The increase was mainly due to the increase of plant dry weight and soil available arsenic content.
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