Development of analytical methods to quantify gaseous selenium emissions

在加拿大及其他地区的许多工业场所，硒是一种令人担忧的主要无机污染物。与大多数其他无机污染物不同的一个**特殊性是，它形成挥发性化合物，**这些化合物可以通过自然过程或作为**处理技术的故意结果**从受影响的地点逃逸到大气中。因此，评估工业场所和大气之间的Se交换**对于关闭这些场所的Se质量平衡是重要的。然而，目前还没有常规的分析方法可用于测量空气样本中的Se，这使得无法准确评估Se**挥发通量。在这项拟议的项目中，我们将开发和验证空气样本中总气态Se的分析方法，最终将用于通过挥发来量化Se的质量通量。**该项目的科学方法是从空气样本中识别出一种能够定量结合不同挥发性Se化合物的固体吸附材料。吸附的Se随后将通过酸消化释放，并在生成的样品中进行测量。该方法将在加拿大一个受Se影响的矿场进行测试，在那里**预计会出现大量的Se挥发通量。这些现场测试将确定该方法是否能够**准确地测量遇到的大气Se浓度，并对该方法的**准备情况进行评估，以用于随后对工业场所**空气与液体或固体表面之间的Se交换的研究。

Selenium (Se) is a major inorganic contaminant of concern at many industrial sites in Canada and beyond. One**particularity that distinguishes Se from most other inorganic contaminants is that it forms volatile compounds,**which can escape from impacted sites to the atmosphere by natural processes or as the intentional result of**treatment technologies. Consequently, assessment of Se exchange between industrial sites and the atmosphere**is important for closing Se mass balances at such sites. At this time, though, there are no routine analytical**methods available for measuring Se in air samples, making it impossible to provide accurate assessment of Se**volatilization fluxes. In this proposed project, we will develop and validate analytical methods for the**determination of total gaseous Se in air samples, which will ultimately be used to quantify the mass flux of Se**through volatilization.**The scientific approach for this project is to identify a solid adsorbent material which binds different volatile Se**compounds quantitatively from air samples. The adsorbed Se will then be released by acid digestion and**measured in the resulting samples. The method will be tested at a Se-impacted mining site in Canada, where**significant Se volatilization fluxes are expected to occur. These field tests will determine if the method can**measure the encountered atmospheric Se concentrations accurately, and provide an assessment of the method's**readiness for use in subsequent studies on Se exchange between air and liquid or solid surfaces at industrial**sites.