氟乐灵在土壤中的持留及其结合残留研究
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*土壤圈物质循环开放试验室资助项目


PERSISTENCE AND BOUND RESIDUE OF TRIFLURALIN IN SOIL
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    摘要:

    本研究揭示了除草剂氟乐灵在不同土壤条件下的持留及其结合残留的形成特征。结果表明:(1)氟乐灵在供试条件下的持留动态基本符合一级反应动力学方程C=C0kr,半衰期t1/2的理论值范围为15至40天,为中等持留性农药。土壤微生物活性是影响氟乐灵降解的主要因素,水分条件对该农药的持留性亦有显著的影响,一般在渍水条件下其降解要比好气条件下快得多;(2)渍水条件下,氟乐灵在土壤中培养两周后便可检出三种降解物,据GC/MS检定结果可初步确定它们均为母体化合物的脱烷基和还原性衍生物;(3)在供试条件下,氟乐灵均可形成土壤结合残留,结合残留量随试验周期延长而增加,且与土壤性质和试验条件有关;(4)仅含结合残留物的土样经高温蒸馏技术处理后所得馏出物的GC测定结果表明,除少量母体化合物外,结合残留物的主要馏出组分的色谱保留时间与降解物的完全吻合,看来代谢物与土壤组分结合是氟乐灵在土壤中形成结合残留的一种主要途径。

    Abstract:

    This gager deals with the characteristics of persistance and bound residue of trifluralin in two soils.The results show that (1) dynamics of trifluralin persistent in soils under the tested conditions basically followed the first-order reaction equation(C=C0-kr) with a half-life (t) of 15-40 days.The most important facter affecting trifluralin degradation was mtcrobial activity in soil.The water conditions of tested soils would markedly affect persistence of the herbicide as well.In general,the rate of degradation of trifluralin in waterlogged soil was much faster than in aerobic soil.(2) Three metaholites,which were detemined by GC/MS as dealkylative and reductive derivatives of parent,were detected after incubation about two weeks in waterlogged red soil.(3) It was found that trifluralin could be bound by soils in considerable amounts.The capacity of soil binding this chemical varied with soil organic matter content the black soil rich in organic matter coold bind more residue than did the red soil.Waterlogged condition was more favourable to the formation of bound residue than aerobic condition in case of the same soil.(4) GC of the distillation products of soil samples containing boand residues by the high temperature distillation technique show that besides small amount of parent compound,they were mainly composed of metabolites.It seems that this herbicide bound residue in soil was mainly formed through the incorporation of the lowly steric hindered reductive derivatives of parent into soil.

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安琼,陈祖义.氟乐灵在土壤中的持留及其结合残留研究[J].土壤学报,1993,30(3):304-311. An Qiong, Chen Zhuyi. PERSISTENCE AND BOUND RESIDUE OF TRIFLURALIN IN SOIL[J]. Acta Pedologica Sinica,1993,30(3):304-311.

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  • 在线发布日期: 2013-02-25
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