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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 25, Number 8
BKCSDE 25(8)
August 20, 2004 

Continuous Preconcentration of Sn2+/Sn4+ by the On-line Sulfide Precipitation-Dissolution
Pyung Heum Yeon, Young-Suk Yoon, Se-Woung Oh, Sang-ho Nam, Yong-Nam Pak*
Preconcentration, Sn2+/Sn4+ speciation, ICP, Sulfide precipitation
The technique of an on-line preconcentration by the direct sulfide precipitation has been developed. Sn was homogeneously precipitated by sulfide, which was generated in situ from the hydrolysis of thioaceteamide. Precipitate was collected on a filter in the line and dissolved out instantaneously by KOH to be sent to an ICP. The enrichment factor was 4 with the sampling speed of 15/hr for 1.0 mL of sample. It was increased to more than 40 times when the sampling volume was increased to 10 mL with the sampling speed of 5/hr. Sn2+/Sn4+ could be separately determined with the on-line precipitation technique. The method was applied to the analysis of NIST SRM 1566 Oyster sample and yielded good agreement with the certified value.
1156 - 1160
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