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

新仪器的开发（早期职业生涯）：激光分解同位素界面 (LADII) - 纳摩尔量的硫酸盐和硝酸盐的总同位素分析

• 批准号: 0929981
• 负责人: Greg Michalski
• 金额: $ 8.32万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-15 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0929981&HistoricalAwards=false
• 关键词: Development; New; Instrumention; Early; Career

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. ***

0929981 Michalski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。该奖项将资助开发激光分解同位素界面（LADII），用于制备非常少量（纳摩尔）的化合物，用于硫酸盐和硝酸盐中的氧同位素分析。即将开发的系统将使用二氧化碳激光器从九摩尔样品中产生足够的气体，以进行δ 34 S，δ 15 N和δ 33 S分析。此外，三重氧同位素分析将有可能达到约0.2 permil的精度。更高的精度和更小的样本量将允许对常见污染物高氯酸盐、磷酸盐和草酸盐进行氧同位素分析。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传输模型。大气沉降和土壤地球化学将从中国中部洞穴沉积物分析评估。将分析来自沙漠西南部和美国中部的流域样本的硫酸盐和硝酸盐同位素比率。LADII接口由于其快速、精确的样品处理能力和处理极其有限的样品量的能力，预计将具有广泛的适用性。迄今为止受样本量限制的研究将对同位素研究开放。仪器的开发将涉及三个博士，一个MS，和三个本科生在PI工作？的实验室。半自动化系统还将减少分析所需的工时- ***