异恶唑草酮在环境介质中的挥发、土壤吸附和水-沉积物系统降解特性

doi:10.3969/j.issn.1004-1524.2019.06.10

浙江农业学报 ›› 2019, Vol. 31 ›› Issue (6): 930-937.DOI: 10.3969/j.issn.1004-1524.2019.06.10

异恶唑草酮在环境介质中的挥发、土壤吸附和水-沉积物系统降解特性

张春荣¹, 单凌燕², 郭钤¹, 许振岚¹, 何红梅¹, 吴珉¹, 赵学平^{1, *}

1.浙江省农业科学院农产品质量标准研究所,省部共建农产品质量安全国家重点实验室(筹),浙江省植物有害生物防控重点实验室,农业农村部农药残留检测重点实验室,浙江杭州 310021;
2.浙江省农产品质量安全中心,浙江杭州 310003

收稿日期:2019-04-01 出版日期:2019-06-25 发布日期:2019-06-26
通讯作者: 赵学平,E-mail:zhaoxueping@tom.com
作者简介:张春荣(1970—),女,河南温县人,硕士,助理研究员,主要从事农药环境行为与农药残留研究。E-mail: crzhang001@126.com
基金资助:
国家自然科学基金青年科学基金(31501668)

Volatility, adsorption and degradation characteristics of isoxaflutole in water, soil and water-sediment system

ZHANG Chunrong¹, SHAN Lingyan², GUO Qian¹, XU Zhenlan¹, HE Hongmei¹, WU Min¹, ZHAO Xueping^{1, *}

1. State Key Laboratory for Quality and Safety of Agro-Products (in Prepared), Key Laboratory for Pesticide Residue Detection of Ministry of Agriculture and Rural Affairs, Institute of Quality and Standard for Agro-Products,Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China;
2. Zhejiang Agricultural Products Quality and Safety Center, Hangzhou 310003, China

Received:2019-04-01 Online:2019-06-25 Published:2019-06-26

摘要/Abstract

摘要： 为评价异恶唑草酮的环境安全性,采用室内模拟试验方法,研究了异恶唑草酮在不同环境介质(空气、水和土壤表面)的挥发特性,在不同质地土壤(潮土、水稻土、黑土和红壤土)的吸附特性,和2种水-沉积物系统中的降解特性。结果表明:异恶唑草酮在潮土、水稻土、黑土和红壤土中的吸附均符合弗罗因德利希(Freundlich)方程,吸附常数值分别为0.640 6、1.376 2、0.816 9和1.289 5,在土壤中属于难吸附农药。异恶唑草酮在湖泊(杭州西湖)水-沉积物系统和河流(杭州运河)水-沉积物系统中的好氧降解和厌氧降解均符合一级动力学方程,好氧降解半衰期分别为73.7 h和75.3 h,厌氧降解半衰期分别为42.3 h和43.0 h,在水-沉积物系统中属于易降解农药。在20~25 ℃、气体流速为500 mL·min^-1的条件下,异恶唑草酮在空气、水和土壤表面的挥发率均小于1%,属于难挥发性农药。试验结果表明,异恶唑草酮在空气、水和土壤表面难挥发,在土壤中难吸附,在水-沉积物系统中降解快,环境风险较小。

关键词: 异恶唑草酮, 挥发性, 土壤吸附, 水-沉积物系统

Abstract: In order to evaluate the risk of isoxaflutole in the environment, the volatility, absorption and degradation characteristics of isoxaflutol was examined by a laboratory test. The results demonstrated that absorption of isoxaflutole in four soil types (fluvo-aquic soil, paddy soil, black soil and red soil) accorded with Freundlich equation. The calculated adsorption coefficient of isoxaflutole in fluvo-aquic soil, paddy soil, black soil and red soil was 0.640 6, 1.376 2, 0.816 9 and 1.289 5, respectively. The results indicated that isoxaflutole was hardly absorbed in these four soil types. The degradation of isoxaflutole in lake (West Lake) and river (Grand Channel) water-sediment system accorded with first-order kinetic equation. The aerobic degradation half-life period was 73.7 h and 75.3 h, respectively, and the anaerobic degradation half-life period was 42.3 h and 43.0 h, respectively. The results indicated that isoxaflutole was an easily degradable pesticide in water-sediment system .The volatility rate of isoxaflutole in air, water and on soil surface was less than 1% under the conditions of 20-25 ℃ and 500 mL·min^-1 gas flow rate, indicating that isoxaflutole belonged to a difficult volatility pesticide. In general, isoxaflutole possessed the characteristics of difficult volatility, difficult absorption and fast degradation in water-sediment system, and had a relatively low risk to environment.

Key words: isoxaflutole, volatilization, soil absorption, water-sediment system

中图分类号:

张春荣, 单凌燕, 郭钤, 许振岚, 何红梅, 吴珉, 赵学平. 异恶唑草酮在环境介质中的挥发、土壤吸附和水-沉积物系统降解特性[J]. 浙江农业学报, 2019, 31(6): 930-937.

ZHANG Chunrong, SHAN Lingyan, GUO Qian, XU Zhenlan, HE Hongmei, WU Min, ZHAO Xueping. Volatility, adsorption and degradation characteristics of isoxaflutole in water, soil and water-sediment system[J]. , 2019, 31(6): 930-937.

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异恶唑草酮在环境介质中的挥发、土壤吸附和水-沉积物系统降解特性

Volatility, adsorption and degradation characteristics of isoxaflutole in water, soil and water-sediment system

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