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Enhanced and irreversible sorption of pesticide pyrimethanil by soil amended with biochars

文献类型： 外文期刊

作者： Yu, Xiangyang 2 ; Pan, Ligang 1 ; Ying, Guangguo 2 ; Kookana, Rai S. 2 ;

作者机构： 1.Jiangsu Acad Agr Sci, Pesticide Biol & Ecol Res Ctr, Nanjing 210014, Peoples R China

2.CSIRO Land & Water, Glen Osmond, SA 50641, Australia

3.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China

4.Beijing Res Ctr Agrifood Testing & Farmland Monit, Beijing 100097, Peoples R China

关键词： Biochar;Pyrimethanil;Sorption;Desorption

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCES （ 影响因子：5.565； 五年影响因子：5.066 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Biochar derived from partial combustion of vegetation is ubiquitous and potentially effective in sequestration of environmental contaminants. Biochars were prepared by burning of red gum (Eucalyptus spp.) woodchips at 450 and 850℃ (labeled as BC450 and BC850). These two biochars were found to possess markedly different properties in terms of surface area and porosity. Short-term equilibration tests (24 hr) were conducted to assess the sorption-desorption behavior of pyrimethanil in the soil amended with various amounts of biochar of each type, with a special focus on the desorption behavior of the sorbed pesticide through four times successive desorption by dilution. Sorption coefficient and isotherm nonlinearity of the amended soils progressively increased with the content of biochar in the soil. Biochar BC850 with higher surface area and microporosity showed a stronger effect on the reversibility of sorption pesticide. The soils amended with 5% BC450 and 1% BC850 had nearly the same sorption capacity for pyrimethanil; however, their desorption processes were very different with 13.65% and 1.49% of the sorbed pesticide being released, respectively. This study suggested that biochar in soil could be an important factor for immobilization of a pesticide and thus affecting its environment fate in soil.

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