Atmospheric Fates of Neonicotinoid Insecticides

新烟碱类杀虫剂在大气中的归宿

• 批准号: 1707883
• 负责人: Barbara Finlayson-Pitts
• 金额: $ 54.41万
• 依托单位: University of California-Irvine
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-09-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1707883&HistoricalAwards=false
• 关键词: Atmospheric; Fates; Neonicotinoid; Insecticides

This award is funded by the Environmental Chemical Sciences (ECS) Program in the Division of Chemistry. Professor Barbara Finlayson-Pitts and her group at the University of California-Irvine (UCI) study the environmental fate of neonicotinoid pesticides. There has been a significant, recent, worldwide decline in bees, which play a major role in pollination. Neonicotinoid pesticides have been implicated in this decline, along with other factors such as parasites and pathogens, loss of habitat and diversity of pollinators. Neonicotinoid pesticides have low toxicity to mammals. However, in the atmosphere they may undergo transformations to form new products that are more toxic than the parent compounds. The goals of this project are to elucidate the atmospheric reactions of neonicotinoids, the rate at which they are changed into other molecules in the environment, and the nature of the resultant molecules. The results of this research will contribute to a molecular level understanding of the atmospheric lifetimes and fates of neonicotinoid pesticides in the environment. The data collected enable scientists to establish the risk assessments for these compounds. Training in current techniques for studying heterogenous chemistry on surfaces is provided to a diverse group of students and postdoctoral fellows. The goal of this research is to provide a molecular level understanding of the photochemistry of surface-bound neonicotinoid insecticides (NNs) and their reactions with trace atmospheric gaseous oxidants. NNs have found increasing use since their first introduction about 25 years ago, largely as seed coatings and soil treatments. Their reactions once in the atmosphere are not well known. This project studies the photochemistry and atmospheric reactions of seven commonly used neonicotinoids which are nitroguanidines (imidacloprid, thiamethoxam, clothianidin and dinotefuran), cyanamidines (thiacloprid and acetamiprid) or nitromethylenes (nitenpyram). The quantum yields for photolysis of the compounds that absorb light at wavelengths relevant to the atmosphere are measured. Also, both the gas phase and solid state products are determined using a variety of techniques. These techniques include attenuated total reflectance and transmission Fourier transform infrared spectrometry and several mass spectrometry techniques. The identity and yields of the products and the kinetics of oxidation by ozone, the hydroxyl radical and the nitrate radical are measured. This is used for a quantitative assessment of the atmospheric lifetimes and fates of neonicotinoids in air.Professor Finlayson-Pitts' is the Co-Director of AirUCI, a collaborative group of faculty at UCI that sponsors a number of educational initiatives, including student research retreats, training in effective communication and discussions of career options. Collaborations and hosting international visitors provides breadth of experience and networking opportunities to group members.

该奖项由化学系环境化学科学（ECS）项目资助。 加州大学欧文分校 (UCI) 的 Barbara Finlayson-Pitts 教授和她的团队研究了新烟碱类杀虫剂对环境的影响。最近，全球范围内蜜蜂数量大幅减少，而蜜蜂在授粉中发挥着重要作用。新烟碱类杀虫剂以及寄生虫和病原体、栖息地丧失和传粉媒介多样性等其他因素都与这种下降有关。新烟碱类农药对哺乳动物毒性较低。 然而，在大气中它们可能会发生转变，形成比母体化合物毒性更大的新产品。 该项目的目标是阐明新烟碱类杀虫剂的大气反应、它们在环境中转变为其他分子的速率以及所得分子的性质。 这项研究的结果将有助于在分子水平上了解新烟碱类农药在环境中的大气寿命和归宿。 收集的数据使科学家能够对这些化合物进行风险评估。为不同群体的学生和博士后研究员提供研究表面异质化学的当前技术的培训。 本研究的目的是提供对表面结合新烟碱类杀虫剂 (NN) 的光化学及其与微量大气气态氧化剂反应的分子水平理解。自大约 25 年前首次推出以来，神经网络的用途越来越多，主要用作种子包衣和土壤处理。 它们进入大气后的反应尚不清楚。 该项目研究七种常用新烟碱类杀虫剂的光化学和大气反应，它们是硝基胍（吡虫啉、噻虫嗪、噻虫胺和呋虫胺）、氰脒（噻虫啉和啶虫脒）或硝基亚甲基（烯啶虫胺）。 测量吸收与大气相关波长的光的化合物的光解量子产率。此外，气相和固态产物均使用多种技术测定。这些技术包括衰减全反射和透射傅里叶变换红外光谱测定法以及多种质谱测定技术。测量了产物的特性和产率以及臭氧、羟基自由基和硝酸根的氧化动力学。它用于对空气中新烟碱类杀虫剂的大气寿命和命运进行定量评估。Finlayson-Pitts 教授是 AirUCI 的联合主任，AirUCI 是 UCI 的一个教师合作小组，赞助了许多教育活动，包括学生研究务虚会，有效沟通和讨论职业选择的培训。 合作和接待国际访客为团体成员提供了广泛的经验和交流机会。

项目成果

Probing Matrix Effects on the Heterogeneous Photochemistry of Neonicotinoid Pesticides, Dinotefuran and Nitenpyram

探究基质对新烟碱类农药呋虫胺和烯啶虫胺异质光化学的影响

• DOI: 10.1021/acsearthspacechem.1c00059
• 发表时间: 2021-04-30
• 作者: A. Rohrbacher;M. J. Ezell;V. Perraud;B. Finlayson‐Pitts
• 通讯作者: B. Finlayson‐Pitts

Photochemistry of Solid Films of the Neonicotinoid Nitenpyram

新烟碱类烯啶虫胺固体膜的光化学

• DOI: 10.1021/acs.est.7b06011
• 发表时间: 2018-02
• 期刊: Environmental Science & Technology
• 影响因子: 11.4
• 作者: Aregahegn, Kifle Z.;Ezell, Michael J.;Finlayson
• 通讯作者: Finlayson

Unexpected formation of oxygen-free products and nitrous acid from the ozonolysis of the neonicotinoid nitenpyram

新烟碱类烯啶虫胺臭氧分解意外生成无氧产物和亚硝酸

• DOI: 10.1073/pnas.2002397117
• 发表时间: 2020-05-11
• 期刊: Proceedings of the National Academy of Sciences
• 作者: Weihong Wang;M. J. Ezell;P. Lakey;K. Aregahegn;M. Shiraiwa;B. Finlayson‐Pitts
• 通讯作者: B. Finlayson‐Pitts

Experimental and Theoretical Studies of the Environmental Sensitivity of the Absorption Spectra and Photochemistry of Nitenpyram and Analogs

烯啶虫胺及其类似物吸收光谱和光化学环境敏感性的实验和理论研究

• DOI: 10.1021/acsearthspacechem.9b00179
• 发表时间: 2019-08-16
• 期刊: ACS Earth and Space Chemistry
• 影响因子: 3.4
• 作者: M. J. Ezell;Weihong Wang;D. Shemesh;Anton Z Ni;R. Gerber;B. Finlayson‐Pitts
• 通讯作者: B. Finlayson‐Pitts

Quantum Yields and N 2 O Formation from Photolysis of Solid Films of Neonicotinoids

新烟碱类固体膜光解的量子产率和 N 2 O 形成

• DOI: 10.1021/acs.jafc.8b05417
• 发表时间: 2019-01
• 期刊: Journal of Agricultural and Food Chemistry
• 影响因子: 6.1
• 作者: Wang, Weihong;Aregahegn, Kifle Z.;Andersen, Simone T.;Ni, Anton Z.;Rohrbacher, Andrea F.;Nielsen, Ole John;Finlayson
• 通讯作者: Finlayson