Stripping analysis combined on-line with inductively coupled plasma-mass spectrometry for enhanced trace metal analysis
Conference
·
OSTI ID:191663
- Oak Ridge National Lab., TN (United States); and others
Inductively coupled plasma-mass spectrometry (ICP-MS) is a sensitive technique for trace elemental analysis with subnanogram-per-milliliter detection limits for most elements. However, for ultratrace determinations, lower detection limits are always desired. Furthermore, ICP-MS is subject to spectroscopic and non-spectroscopic interferences originated from the sample matrix. Both of the above aspects can be addressed by combining stripping analysis (SA) on-line with ICP-MS, since signals can be enhanced by the preconcentration effect inherent in SA and matrix effects can be eliminated by the {open_quotes}medium-exchange{close_quotes} procedure employed in SA. Effective elimination of matrix effects using SA/ICP-MS has been demonstrated by Pretty et al. However, with their approach (a coulometric cell coupled on-line with ICP-MS), decreased ICP-MS detection limits were not realized. In this presentation, the authors will demonstrate that the ICP-MS detection limits for some elements can be lowered by 2-3 orders of magnitude by replacing the coulometric cell with a thin-layer, low-dead volume cell. Quantitative analysis of samples of subpicogram-per-milliliter concentration is achieved. Determination of the heavy metal concentrations in certified urine sample is used to demonstrate the effective elimination of sample matrix effects. Since detection of multiple elements is carried out by mass spectrometry, some problems associated with SA such as the overlapping potentials and intermetallic compound formation can be overcome. Finally, the author`s approach is experimentally simpler and the sample throughput is higher than that based on the coulometric cell.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 191663
- Report Number(s):
- CONF-941098--
- Country of Publication:
- United States
- Language:
- English
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