Ion-selective electrodes in organic analysis: Determination of alkyl halides via in situ generation of S-alkylisothiouronium salts

Wing Hong CHAN*, Albert W M LEE, Yu Man Cheung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Low relative molecular mass alkyl halides, after in situ derivatization to the corresponding S-alkyl-isothiouronium salts in the presence of an excess of thiourea, were determined with a poly(vinyl chloride) membrane S-alkylisothiouronium-selective electrode based on S-butylisothiouronium tetraphenylborate. This membrane electrode exhibited Nernstian response in the range 1.0 × 10-1-1.6 × 10-4 mol dm -3 with an average cationic (positive) slope of 58.8 mV per concentration decade at 25°C. The electrode had a reasonably wide working pH range (6.5-8.5), fast dynamic response time (30 s-2 min), stable response for at least 2 months and high selectivity for the S-alkylisothiouronium ion in the presence of many inorganic and organic ions. The electrode functioned satisfactorily for the determination of primary and secondary alkyl halides, excluding alkyl fluorides.

Original languageEnglish
Pages (from-to)39-43
Number of pages5
JournalThe Analyst
Volume116
Issue number1
DOIs
Publication statusPublished - 1991

Scopus Subject Areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy
  • Electrochemistry

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