Abstract
Analytical and fundamental characteristics of helium inductively coupled plasma mass spectrometry (He ICPMS) were explored for atmospheric-pressure plasmas generated in a 13-mm He ICP torch with the use of a prototype ICPMS equipped with an analogue detector. Four sets of operating conditions were identified for the detection of four categories of elements at levels lower than or similar to those of the Ar ICPMS. In general, detection limits of He ICPMS were improved by two to four orders of magnitude for metals, compared to results from our previous study with the same torch. For the easy-to-atomize elements (Li, Na, K, Ga, Rb, In, Cs, Tl, Pb, and Bi), the detection limits ranged from 0.1 to 7 pg/mL at 500-600 W forward power. Detection limits of the fourth-period transition metals (Cr, Mn, Fe, Co, Ni, and Cu), i.e., elements subject to the spectral interferences in Ar ICPMS, were 4 to 100 pg/mL at a power level of 560-700 W. The detection limits of hard-to-atomize elements (Ti, V, Sr, Y, Rh, Pr, Tm, Th) ranged from 4 to 90 pg/mL at 800 W. For hard-to-ionize elements (As, Se, Br, Sn Sb, I), detection limits of 0.05 to 1 ng/mL were obtained at 820 W. Ion kinetic energies were measured under two diverse sets of operating conditions. At 600 W, the ion kinetic energies were very low (2.6-6.6 eV for mass range 39-209 amu), indicating the absence of a secondary discharge at the sampler tip of the MS interface. The gaskinetic temperature estimated in this measurement was 600 K for the 600-W He ICP. In contrast, very high ion kinetic energies (31-66 eV for mass range 51-232 amu) were obtained at 800 W. The estimated plasma potential and gas kinetic temperature were 22 V and 3500 K, respectively. Ion kinetic energies of polyatomic ions were slightly lower than those of atomic ions at the same mass, suggesting that polyatomic ions were formed in the low-temperature zones of the He ICP.
PDF Article
More Like This
Multielemental analysis of prehistoric animal teeth by laser-induced breakdown spectroscopy and laser ablation inductively coupled plasma mass spectrometry
Michaela Galiová, Jozef Kaiser, Francisco J. Fortes, Karel Novotný, Radomír Malina, Lubomír Prokeš, Aleš Hrdlička, Tomáš Vaculovič, Miriam Nývltová Fišáková, Jiří Svoboda, Viktor Kanický, and Javier J. Laserna
Appl. Opt. 49(13) C191-C199 (2010)
Practical and highly sensitive elemental analysis for aqueous samples containing metal impurities employing electrodeposition on indium-tin oxide film samples and laser-induced shock wave plasma in low-pressure helium gas
Koo Hendrik Kurniawan, Marincan Pardede, Rinda Hedwig, Syahrun Nur Abdulmadjid, Kurnia Lahna, Nasrullah Idris, Eric Jobiliong, Hery Suyanto, Maria Margaretha Suliyanti, May On Tjia, Tjung Jie Lie, Zener Sukra Lie, Davy Putra Kurniawan, and Kiichiro Kagawa
Appl. Opt. 54(25) 7592-7597 (2015)
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription