Pollutant and Soil Types Influence Effectiveness of Soil-Applied Absorbents in Reducing Rice Plant Uptake of Persistent Organic Pollutants  

作　　者：LIU Cuiying JIANG Xin MA Yuchun Barbara J.CADE-MENUN 

机构地区：[1]Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Jiangsu Key Laboratory of Agricultural Meteorology, College of Applied Meteorology, Nanjing University of Information Science and Technology [2]State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences [3]Agriculture and Agri-Food Canada, Semiarid Prairie Agricultural Research Centre

出　　处：《Pedosphere》2017年第3期537-547,共11页土壤圈（英文版）

基　　金：supported by the Open Fund Project of Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, China (No. JKLAM1605)

摘　　要：Persistent organic pollutants （POPs） in soils are an environmental concern due to their long-term bioavailability, which could be reduced by adding adsorbents. However, testing of these adsorbents is necessary prior to widespread field application. The effects of three adsorbents, nano-organic montmorillonite, nano-organic silicon dioxide （SiOs）, and activated carbon, on hexachlorobenzene （HCB） and pentachlorobenzene （PeCB） accumulation in rice （Oryza sativa L.） plants were tested in a greenhouse experiment using two soils, a Hydragric Acrisol （Ac） and a Gleyi-Stagnic Anthrosol （An）. The bioconcentration factors （BCFs） of HCB and PeCB to rice roots were 2.3-3.7 and 2.0 3.0 times those to rice shoots, respectively. The applications of the three adsorbents decreased HCB and PeCB extractability in Ac, while only the application of activated carbon decreased their extractability in An. The bioavailability of HCB and PeCB to rice plants in Ac was higher than that in An. In Ac, the applications of nano-organic SiOs and activated carbon decreased the BCF of HCB to rice roots by 16.1% and 26.8%, respectively, whereas only the application of activated carbon decreased the BCF of PeCB to rice roots by 31.4%, compared to the control. In An, only the application of activated carbon decreased the BCFs of HCB and PeCB to rice roots by 22.9% and 18.2%, respectively, compared to the control. However, the application of nano-organic montmorillonite inhibited rice growth in both soils. The results of this study suggested that the effectiveness of adsorbents would vary with pollutant and soil types, providing a reference point for developing efficient adsorbents to reduce the ecological risk of POPs.Persistent organic pollutants(POPs) in soils are an environmental concern due to their long-term bioavailability, which could be reduced by adding adsorbents. However, testing of these adsorbents is necessary prior to widespread field application. The effects of three adsorbents, nano-organic montmorillonite, nano-organic silicon dioxide(SiO_2), and activated carbon, on hexachlorobenzene(HCB) and pentachlorobenzene(Pe CB) accumulation in rice(Oryza sativa L.) plants were tested in a greenhouse experiment using two soils, a Hydragric Acrisol(Ac) and a Gleyi-Stagnic Anthrosol(An). The bioconcentration factors(BCFs) of HCB and Pe CB to rice roots were 2.3–3.7 and 2.0–3.0 times those to rice shoots, respectively. The applications of the three adsorbents decreased HCB and Pe CB extractability in Ac, while only the application of activated carbon decreased their extractability in An. The bioavailability of HCB and Pe CB to rice plants in Ac was higher than that in An. In Ac, the applications of nano-organic SiO_2 and activated carbon decreased the BCF of HCB to rice roots by 16.1% and 26.8%, respectively, whereas only the application of activated carbon decreased the BCF of Pe CB to rice roots by 31.4%, compared to the control. In An, only the application of activated carbon decreased the BCFs of HCB and Pe CB to rice roots by 22.9% and 18.2%, respectively, compared to the control. However, the application of nano-organic montmorillonite inhibited rice growth in both soils. The results of this study suggested that the effectiveness of adsorbents would vary with pollutant and soil types, providing a reference point for developing efficient adsorbents to reduce the ecological risk of POPs.

关 键 词：accumulation activated carbon bioconcentration factor HEXACHLOROBENZENE NANO-MATERIALS pentachlorobenzene 

分 类 号：X53[环境科学与工程—环境工程]