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Trace Analysis and Speciation for Methylated Organotins by HPLC-Hydride Generation-Direct Current Plasma Emission Spectroscopy (HPLC-HY-DCP)

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Total tin determinations can be accomplished at trace levels (10-25 ppb) by a continuous on-line hydride generation (HY), followed by direct current plasma (DCP) emission spectroscopy (HY-DCP). This approach is applicable for organotin compounds such as mono-, di-, and trimethyltin chloride, as well as stannous and stannic cations. HY-DCP methods of total tin analysis have been applied to a number of spiked and actual samples. Detection limits, calibration plots, sensitivities, and related analytical parameters have been evaluated. Organotin analysis and speciation can be accomplished by the interfacing of this HY-DCP step with high-performance liquid chromatography (HPLC), with the use of a polymeric PRP-1 type column with an acidic, ionic mobile phase, usually containing a suitable ion-pairing reagent. The overall speciation approach, HPLC-HY-DCP, has been evaluated with regard to separation conditions; detection limits; sensitivities; calibration plots; and applications to spiked water, clam juice, seawater, and tuna fish samples. The results suggest the suitability and reliability of this HPLC-HY-DCP approach for individual tin species. Other metal species capable of forming a hydride derivative on-line, in a continuous fashion, may also be suitable for speciation by HPLC-HY-DCP.

Keywords: Direct current plasma emission spectroscopy; High-performance liquid chromatography; Hydride generation; Hyphenated techniques; Tin speciation

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702854249402

Affiliations: 1: Department of Chemistry and The Barnett Institute, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 02115 2: U.S. Food and Drug Administration, Boston District Office, 585 Commercial Street, Boston, Massachusetts 02109

Publication date: November 1, 1985

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