Nam S H, Zhang H, Cai M, Lim J S, Montaser A
Department of Chemistry, The George Washington University, 20052, Washington, DC, USA.
Anal Bioanal Chem. 1996 Jun;355(5-6):510-20. doi: 10.1007/s0021663550510.
The current status of helium inductively coupled plasma - mass spectrometry (He ICPMS) is examined, its potentials and limitations are reviewed, and a summary of fundamental properties of atmospheric pressure He ICP discharges is presented. Also included are results of He ICPMS studies with a new helium plasma torch (18 mm i.d.) operated at four sets of operating conditions. Under the "cold plasma" condition (600 W forward power), no secondary discharge is observed and ion kinetic energies ranging from 2.0 eV to 9.5 eV for 6 elements (mass range: 39-208) are measured. At higher power levels, the secondary discharge still is strong. In general, detection limits for certain elements are improved by 1-3 orders of magnitude compared to previous data acquired in 1993 with a 13-mm He ICP torch. Elements such as K, Fe, Cr, Mn, Ni, and Co that suffer from spectral interferences in Ar ICPMS can be detected at pg/mL-levels with an analogue detector and a prototype ICPMS instrument having no photon stops or obstacles present in the ion trajectory path.
本文考察了氦电感耦合等离子体质谱（He ICPMS）的现状，综述了其潜力和局限性，并介绍了大气压氦ICP放电的基本特性总结。文中还包括了使用新型氦等离子体炬（内径18 mm）在四组操作条件下进行He ICPMS研究的结果。在“冷等离子体”条件（正向功率600 W）下，未观察到二次放电，并且测量了6种元素（质量范围：39 - 208）的离子动能在2.0 eV至9.5 eV之间。在更高功率水平下，二次放电仍然很强。总体而言，与1993年使用13 mm氦ICP炬获得的先前数据相比，某些元素的检测限提高了1 - 3个数量级。诸如钾、铁、铬、锰、镍和钴等在氩ICPMS中受到光谱干扰的元素，使用模拟探测器和离子轨迹路径中没有光子阻挡器或障碍物的原型ICPMS仪器，可以在pg/mL水平进行检测。
