权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

LEAPS-MPS: Exploration of heterogenous reactions of mercury in the Arctic environment

LEAPS-MPS：北极环境中汞的异相反应探索

基本信息

批准号：
2137662
负责人：
Abu Asaduzzaman
金额：
$ 14.97万
依托单位：
Pennsylvania State Univ University Park
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2022
资助国家：
美国
起止时间：
2022-04-01 至 2024-03-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2137662&HistoricalAwards=false
关键词：
LEAPS MPS Exploration heterogenous reactions

项目摘要

This award is supported by the Environmental Chemical Sciences Program and the Broadening Participation Program in the Division of Chemistry. Professor Asaduzzaman at the Pennsylvania State University Harrisburg and his students study the reactions of oxidized mercury species with snow and ice by performing quantum chemical calculations. Mercury is a toxic element that poses severe health issues to the mammalian and human body. It can be transported long distances via the atmosphere and magnify in aquatic food ecosystems. After oxidation in presence of halogens, ozone, and nitro compounds in the Arctic atmosphere, it is deposited on snow and ice surfaces. The oxidized mercury compounds then diffuse through the ice and reach the aquatic environment, where they convert into methylmercury, which is then readily taken up by plankton and is biomagnified in the food web. This project focuses on characterizing the elementary steps for the interactions of oxidized mercury compounds with snow and ice, which control the process for mercury reaching the aquatic environment. This research has potential to understand the mechanism for mercury deposition, reduction, and diffusion on the Arctic surface. The project provides research opportunities for multiple undergraduate students and a high school teacher through a research experience for teachers program. The research will focus on calculating the atomic scale interaction of oxidized mercury with ice and snow using the quantum chemical methodologies. The project will explore the deposition of oxidized mercury on the ice/snow surface, and the reduction and re-emission of deposited mercury into the atmosphere. This project can help understand many reactions of mercury with ice and snow, diffusion of deposited mercury into the ice, and conversion of inorganic to organic mercury compounds. The results will aid in determining the rate-limiting steps in the mercury oxidation-reduction processes, and ultimately in developing more accurate global atmospheric mercury models.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该奖项得到了化学系环境化学科学计划和扩大参与计划的支持。宾夕法尼亚州立大学哈里斯堡分校的阿萨杜扎曼教授和他的学生通过量子化学计算研究氧化汞与冰雪的反应。汞是一种有毒元素，会对哺乳动物和人体造成严重的健康问题。它可以通过大气进行长距离运输，并在水生食物生态系统中放大。在北极大气中的卤素、臭氧和硝基化合物存在下氧化后，沉积在雪和冰表面。然后，氧化的汞化合物通过冰扩散并到达水生环境，在那里转化为甲基汞，然后很容易被浮游生物吸收并在食物网中生物放大。该项目的重点是描述氧化汞化合物与雪和冰相互作用的基本步骤，从而控制汞到达水生环境的过程。这项研究有可能了解北极表面汞沉积、还原和扩散的机制。该项目通过教师研究经验项目为多名本科生和一名高中教师提供研究机会。该研究将重点利用量子化学方法计算氧化汞与冰雪的原子尺度相互作用。该项目将探索氧化汞在冰/雪表面的沉积，以及沉积汞的还原和再排放到大气中。该项目可以帮助了解汞与冰和雪的许多反应、沉积的汞扩散到冰中以及无机汞化合物到有机汞化合物的转化。结果将有助于确定汞氧化还原过程中的速率限制步骤，并最终开发更准确的全球大气汞模型。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。