Development of New Instrumention (Early Career): Laser Decomposition Isotope Interface (LADII)- Total Isotope Analysis of Nanomolar Amounts of Sulfate and Nitrate

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。该合同将资助开发激光分解同位素界面（LADII），用于制备极少量（纳摩尔）的化合物，用于硫酸盐和硝酸盐中的氧同位素分析。该系统将使用二氧化碳激光从非摩尔样品中产生足够的气体，以进行delta 34S， delta 15N和delta 33S分析。此外，三氧同位素分析将可能达到~0.2 permil的精度。更高的精度和更小的样本量将允许在高氯酸盐，磷酸盐和草酸盐中进行氧同位素分析，这是常见的污染物。PI还将分析降水样本，以更好地了解同位素分布，这反过来将有助于限制大气化学输送模型。大气沉积和土壤生物地球化学将从中国中部的洞穴分析进行评估。来自西南部沙漠和美国中部的流域样本将被分析硫酸盐和硝酸盐的同位素比率。由于其快速、精确的样品处理能力和处理极有限样品数量的能力，预计LADII接口将具有广泛的适用性。迄今为止受样本量限制的研究将向同位素研究开放。仪器开发将涉及三名博士，一名硕士和三名在PI工作的本科生。s实验室。半自动化系统还将减少分析所需的人-小时-为额外的科学方向和努力释放时间。＊＊＊

0929981MichalskiThis award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).This award will fund developing a Laser Decomposition Isotope Interface (LADII) for preparing very small (nanomolar) quantities of compounds for oxygen isotope analysis in sulfate and nitrate. The system to be developed will use a carbon dioxide laser to produce sufficient gas from nonamolar samples to also perform delta 34S, delta 15N and Delta 33S analysis. In addition, triple oxygen isotope analysis will be possible at ~0.2 permil precision. The enhanced precision and smaller sample size will allow oxygen isotope analysis in perchlorate, phosphate and oxalate, which are common contaminants. The PI will also analyze precipitation samples to better understand isotopic distributions which will, in turn, assist in constraining atmospheric chemical transport models. Atmospheric deposition and soil biogeochemistry will be assessed from central Chinese speleothem analysis. Watershed samples from the desert southwest and the central US will be analyzed for sulfate and nitrate isotope ratios. The LADII interface is expected to have broad applicability due to its capability for rapid, precise sample processing and its ability to process extremely limited sample quantities. Studies heretofore hindered by sample size will be open to isotopic investigations. The instrument development will involve three PhD, one MS, and three undergraduate students working in the PI?s laboratory. The semi-automated system will also reduce the person-hours needed for analysis - releasing time for additional scientific directions and efforts. ***