Purity tests of high-purity metals for the creation of new functional materials

用于创建新功能材料的高纯度金属纯度测试

基本信息

批准号：
03650610
负责人：
TANAKA Tatsuhiko
金额：
$ 0.96万
依托单位：
Science University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

The present report describes the appropriate methods for the purity tests of high-purity metals for creating new functional materials.1. Determination of trace impurities at the low ppm level in high-purity metals frequently requires preconcentration steps to improve detection limits, precision and accuracy. Microscale preconcentration techniques developed are useful for the analyses of expensive and precious samples available only in small quantities and studies of heterogeneous distribution of trace elements in high-purity metals. Microscale preconcentration techniques using 1- to 10-milligram samples and microliter volumes of solutions seem to be desirable from viewpoints of economy of high-purity reagents as well as minimization of experimental wastes. In addition, they require a narrower working bench space and sometimes are more rapid than conventional ones. Several simple apparatus and new techniques for ion exchange, liquid-liquid extraction and electrolytic separations have be … More en devised to attain easy and secure operations and ensure the precision and accuracy of analytical results.2. Cathodic stripping voltammetry (CSV) is a highly sensitive analytical technique that combines a preconcentration step (pre-electrolysis) with a determination step (stripping). Some discrepancies between the experimental results of CSV were clarified and reliable practical methods were established for the determination of sulfur and manganese in high-purity metals.3. Coulometric titration is one of the most precise and accurate techniques of chemical analysis and makes calibrations unnecessary. A few useful methods were proposed for directly purity tests of high-purity metals.4. New, simple and rapid methods were developed for the determination of trace non-metal elements in high-purity steels. Carbon, sulfur and phosphorus in steels were determined in safety and with good precision and accuracy by a modified wet chemical oxidation-nonaqueous coulometric titration, CSV with a silver disk electrode after conversion of sulfur into hydrogen sulfide and reflectance photometry with a hydrogen sulfide of phosphine detecting tape, respectively. Less

本报告描述了用于创建新功能材料的高纯度金属纯度测试的适当方法。1。在高纯度金属中，在低ppm水平上的痕量杂质经常需要预浓缩步骤以提高检测限，精度和准确性。开发的显微镜预浓缩技术对于仅少量可用的昂贵和珍贵样品的分析和对痕量显微镜预浓缩技术的异质分布进行的研究很有用，从高纯度的经济学来看，似乎是可以看到的。此外，它们需要一个较窄的工作台空间，有时比传统的台式更快。几种简单的设备和新技术用于离子交换，液体液体提取和电解性分离已经……更加设计以实现易于且安全的操作，并确保分析结果的精确性和准确性。2。阴极剥离伏安法（CSV）是一种高度敏感的分析技术，它结合了预浓缩步骤（前电解前）和确定步骤（剥离）。阐明了CSV的实验结果之间的一些差异，并建立了可靠的实际方法来确定高纯度金属中的硫和锰。3。 Coulometric滴定是化学分析的最精确，最准确的技术之一，使校准不必要。提出了一些有用的方法，用于直接的高纯度金属纯度测试4。开发了新的，简单和快速的方法，用于确定高纯度钢中的痕量非金属元素。通过改良的湿化学氧化物氧化物官方库米滴定，在安全性和准确性上确定钢中的碳，硫和磷在钢中的确定，在将硫转化为硫化氢后用银盘电极和银盘电极的CSV来确定，并用硫化含铁材料的硫化材料的氢化物转化为硫化氢。较少的