Anodic stripping voltammetry coupled on-line with ICP-MS
Conference
·
OSTI ID:210578
- Oak Ridge National Lab., TN (United States)
Inductively coupled plasma-mass spectrometry (ICP-MS) is a sensitive technique for elemental analysis which provides submicrogram-per-liter (sub-ppb) detection limits (DLs) for most elements. The drive towards lower DLs in response to regulatory mandates and the need to eliminate problems imposed in quantitative analyses by sample matrices are research areas of active pursuit in ICP-MS. A generic means to effectively lower concentration detection limits and eliminate matrix effects is an on-line preconcentration/matrix elimination device. Anodic stripping voltammetry (ASV) coupled on-line with ICP-MS has proven to be an effective and relatively simple method for on-line preconcentration and matrix elimination ASV utilizes an electrochemical deposition step to preconcentrate metal species from solution into the small volume of a mercury electrode. After deposition, the metal is electrochemically oxidized, thereby stripping it from the electrode back into solution. In previous work, the authors have shown that concentration detection limits for a VG Plasma Quad, equipped with a conventional nebulizer and spray chamber, could be lowered by at least an order-of-magnitude for some elements (e.g., Tl) with on-line ASV-ICP-MS using a thin-layer, low-dead volume (i.e., 1.0 {mu}L) flow-by electrochemical cell.
- OSTI ID:
- 210578
- Report Number(s):
- CONF-9505261--
- Country of Publication:
- United States
- Language:
- English
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