Replacement mercury-in-air analyzer for quantifying mercury retention in ecosystems

汞是一种急性神经毒性和内分泌干扰化学品，在食物网中会产生生物放大作用，对高营养级生物的神经和生殖产生影响。汞污染是一个全球性问题，在可预见的未来，汞污染将对人类和汞敏感生态系统中的食物网构成越来越大的健康风险。虽然人们对汞进入生态系统的情况了解很多，但对汞从生态系统中的流失和汞的净留存（通常称为生态系统敏感性）了解甚少。汞以Hg（0）的形式流失到大气中是一个重要的过程，它在很大程度上控制着汞在生态系统中的滞留以及汞在海洋中的全球分布。因此，测量环境空气中和天然水中溶解的痕量Hg（0）的能力至关重要。若干国家（如加拿大汞科学评估）和国际（环境署全球汞条约）倡议导致对汞分析的需求增加。O 'Drivel博士在加拿大环境分析研究中心（CARE）的汞实验室是研究人员在加拿大东部和全球范围内研究汞污染物的合作中心。CARE提供先进的分析设备（来自五个成功的CFI应用），用于研究和测量环境中的污染物。这种分析能力是我正在进行的研究计划的一个关键组成部分;然而，在Arndia现有的空气中Hg（0）分析设备现在已经过时（Tekran于2015年停产）。现有设备需要许多供应商不再提供的替换部件，此外，也不具备我们研究计划所需的检测限和精度。这是加拿大东部唯一可用的同类分析仪，对于完成许多正在进行的研究项目和论文至关重要。所要求的升级汞分析仪还将提高我们目前项目所需分析的准确性和再现性。这一升级后的设备将提供最先进的分析能力，并将支持许多研究生的工作和许多来访的国际合作者和学生的相关培训。许多学生（未来5年每年超过10名学生）将从该设备中受益，该设备将连接几所国际大学的研究生培训。该研究计划中开发的科学直接纳入预测模型，用于国家和国际层面的政策制定，并最终有助于保护人类和生态系统健康。

Mercury is an acute neurotoxicant and endocrine-disrupting chemical that biomagnifies in food webs, resulting in neurological and reproductive effects in higher trophic level organisms. Mercury pollution is a global problem that will pose increasing health risks to humans and food webs in mercury sensitive ecosystems into the foreseeable future. While much is known about mercury entry in ecosystems much less is known about mercury loss from ecosystems and the net retention of mercury (often referred to as ecosystem sensitivity). Mercury loss to the atmosphere in the form of Hg(0) is a significant process that largely controls mercury retention in ecosystems and the global distribution of mercury in oceans. As such, the ability to measure Hg(0) in both ambient air and dissolved in trace levels in natural water is essential. Several national (e.g. Canadian Mercury Science Assessment) and international (UNEP Global Mercury Treaty) initiatives are resulting in an increased demand for mercury analyses.*******Dr. O'Driscoll's mercury lab in Acadia's Center for Analytical Research on the Environment (CARE) is a collaborative hub for researchers examining mercury contaminants in Eastern Canada and globally. CARE provides advanced analytical equipment (from five successful CFI applications) for studying and measuring contaminants in the environment. This analysis capability is a key component of my ongoing research program; however, the existing Hg(0)-in-air analysis equipment at Acadia is now obsolete (discontinued by Tekran in 2015). The existing equipment requires many replacement parts which are no longer available from the supplier, and in addition does not have the detection limits and precision required for our research program. This is the only available analyzer of its kind in eastern Canada and it is critical to the completion of many ongoing research projects and theses. The requested upgraded mercury analyzer will also allow for increased accuracy and reproducibility of analyses required for our current projects. This upgraded equipment will provide state-of-the-art analysis capabilities and will support the work of many graduate students and the associated training of many visiting international collaborators and students. Many students (>10 students per year over next 5 years) with benefit from this equipment which will link graduate student training at several international universities. The science developed within this research program is directly incorporated into predictive models that are being used for policy development at national and international levels and will ultimately help to protect human and ecosystem health.******