Determination of halogens by low-pressure helium ICP-MS

作者：Hayashi H^*; Hara Y; Tanaka T; Hiraide M

来源：Bunseki Kagaku, 2003, 52(4): 275-278.

DOI：10.2116/bunsekikagaku.52.275

• low-pressure helium ICP-MS
• electrothermal vaporization
• halogen
• fluorine

A low-pressure ICP formed with helium has been utilized as an ion source for MS, which is capable of providing information about traces of iron, arsenic and selenium without any interference from ArO+, ArCl+ and Ar-2(+), respectively. The present paper describes the application of a novel ICP for the determination of fluorine, chlorine, bromine and iodine, because the ionization of these halogens is highly suppressed in the case of conventional argon ICP (e.g., 9 x 10(-4)% for fluorine). A 5 mul aliquot of an aqueous sample was placed on a looped tungsten filament and heated electrothermally at ca. 2500degreesC. The resulting sample vapor was transported to the ICP with a stream of helium. The analytes (F-19(+), Cl-35(+), Br-79(+) and I-127(+)) were then determined by a quadrupole mass analyzer. The detection limits (ng ml(-1), based on 3sigma) were 23 (F), 2.4 (Cl), 0.13 (Br) and 0.05 (I), which were much better than those, of argon ICP. The absolute detection limits using 5 mul of a sample reached to the sub-picogram range. Especially, the detectability for fluorine was significantly improved, which allowed a direct determination of fluorine at the ng ml(-1) level in water.

• 出版日期2003-4