有机溶液在空气-氩气ICP中的光谱特性研究

SPECTROSCOPIC STUDIES OF AIR-ARGON COOLED ORGANIC ICP

本文着重研究了在40.68MHz的小功率空气-氩气冷却ICP中以MIBK为溶剂的有机溶液的光谱特性,考察了不同分析谱带随空气含量不同而变化的情况,特别是冷却气中空气含量为50%时,ICP中各种分子谱带对12种元素的28条灵敏线的光谱干扰情况。结果表明,空气-氩气冷却ICP对由有机溶液产生的C_2和CN谱带的发射有很强的抑制作用,可有效地控制这些谱带对有关分析线的干扰。另外,空气-氩气ICP还可消除有机物在内炬管口处造成的碳粒沉积。

With a commercial 40.68 MHz ICP spectrometer, we obtained a low power air-argon cooled ICP. The spectral characteristics of MIBK solution in the plasma have been studied unber different working conditions, and have been compared with pure argon ICP and pure air ICP. It is found that when the air in coolant gas attains 50%, the intensifies of carbon molecular band and carbon atomic lines that are very strong in argon ICP have been largely depressed. The CN bands are very intensive when air quantity is about 10%, but with the increase of air in coolant gas, the CN molecules are oxidated by the excess oxygen in air and the band intensity declines.The spectral interference of molecular spectrum to 28 anaiytical lines of 12 elements in MIBK solution has also been studied.As importantly, it is found that in air-argon organic ICP, there is no carbon deposit on the injector.