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Evaluation of the amount of elements released from an ICP into the atmosphere and zero emission in ICP-MS

评估从 ICP 释放到大气中的元素量以及 ICP-MS 中的零排放

基本信息

批准号：
15550068
负责人：
TANAKA Tomokazu
金额：
$ 2.37万
依托单位：
Fukui University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

The emission of elements from ICP mass spectrometer In order to collect the elements passing through the duct of a mass spectrometer, a sampling system with a membrane filter was made. The filter was set in a commercial available holder used for decompression filtration. One end of a metallic pipe (2 mm i.d.) was brought near to the filter and the other end was inserted into the center of the duct. While a solution of 10 μg Yb/ml was introduced into plasma, a part of analyte passing through the duct was colleted on the filter for a period of 30 min. The sample particles collected on the filter was desorbed into 5 ml of 0.1 M HNO_3 by irradiating ultrasonic wave. Although the analyte in the sample solution was determined by GF-AAS, no peak was observed, and consequently, the amount of analyte emitted from ICP-MS could not be measured quantitatively. This is probably due to the use of the pipe with small inner diameter. It is necessary to quantitatively determine the amount of elements emitted from ICP into the environment by improving the sampling system.Low-pressure helium-ICP-MS Since it was difficult to continuously introduce aqueous solutions into low-pressure helium-ICP, a ultrasonic nebulizer was constructed in our laboratory. The generated sample aerosol was transported to a desolvation unit by the nebulizer gas. A PTFE-capillary interface between the sample introduction system and plasma enabled the operation of the nebulizer under atmospheric pressure conditions and the stable introduction of sample solutions. The plasma diagnosis with a Langmuir probe was made. The electron temperature measured for low-pressure helium-ICP was superior to that for argon-ICP. These results suggest that the ionization of analytes in the low-pressure helium-ICP was enhanced by electron impact with high-energy electrons. It was found that low-pressure helium-ICP is a promising ion source for zero emission in ICP-MS.

ICP质谱仪的元素发射为了收集通过质谱仪导管的元素，制作了一个带有膜过滤器的进样系统。将过滤器设置在用于减压过滤的市售保持器中。金属管的一端（内径2 mm）靠近过滤器，另一端插入导管中心。当10 μg Yb/ml溶液引入血浆中时，一部分通过导管的待测物被收集在滤膜上30 min，滤膜上收集的样品颗粒经超声波照射解吸到5 ml 0.1 M HNO_3中。虽然通过GF-AAS测定了样品溶液中的分析物，但未观察到峰，因此，无法定量测定从ICP-MS发射的分析物的量。这可能是由于使用了内径较小的管道。通过改进进样系统，定量测定ICP向环境中释放的元素量是必要的。低压氦-ICP-MS由于难以连续地将水溶液引入低压氦-ICP中，因此在我们的实验室中构建了超声雾化器。通过雾化器气体将生成的样品气溶胶输送至去溶剂化单元。样品引入系统和等离子体之间的PTFE-毛细管接口使得雾化器能够在大气压条件下操作并稳定引入样品溶液。用朗缪尔探针进行了等离子体诊断。低压氦-ICP测量的电子温度优于氩-ICP的电子温度，为上级。这些结果表明，在低压氦ICP的电离分析物的增强与高能电子的电子碰撞。结果表明，低压氦离子源是一种很有前途的零发射离子源。