Reduction of polyatomic interferences during ion-chromatographic speciation of metal ions via their EDTA complexes along with ICP-MS detection using an octopole reaction system
Sun, Qian（Cooperat Res Ctr Contaminat Assessment & Remediat, Mawson Lakes, SA 5095, Australia）
Chen, ZuLiang（Cooperat Res Ctr Contaminat Assessment & Remediat, Mawson Lakes, SA 5095, Australia）
Megharaj, Mallavarapu（ Cooperat Res Ctr Contaminat Assessment & Remediat, Mawson Lakes, SA 5095, Australia）
Naidu, Ravendra（Cooperat Res Ctr Contaminat Assessment & Remediat, Mawson Lakes, SA 5095, Australia）
- 海洋环境－已发表论文 
Metal ions, in the form of their EDTA complexes, can be separated and determined by ion chromatography coupled to inductively coupled plasma mass spectrometry (ICP-MS). However, polyatomic interferences can occur during ICP-MS process and this requires techniques for removing or reducing them. ICP-MS combined with an octopole reaction system was used to reduce polyatomic interferences during the detection of metal ions (Mn-55, Fe-56, Co-59, Ni-60, Cu-63, Zn-64, Pb-208) as their EDTA complexes followed by the separation of IC. The results indicated that polyatomic interferences can be reduced for the detection of Fe-56, Ni-60, Cu-63 and Zn-64 if either helium or hydrogen gas was added to the collision/reaction cell. Hydrogen was preferred since it resulted in higher sensitivity and lower background intensity. The separation of seven metal ions was achieved on an anion-exchange column within 7 min using diammoniumhydrogen phosphate buffer of pH 7.5 as the mobile phase. The detection limits were in the range of 0.1-0.5 mu g L-1 with the exception of Fe (5.0 mu g L-1) if hydrogen was the reaction gas. The method was applied to the determination of metal ions in natural water samples.