Potentiometer selective determination of hydrogen sulfide by an electropolymerized membrane electrode based on binaphthyl-20-crown-6
✍ Scribed by Yi Long Ma; Ahmed Galal; Hans Zimmer; Harry B. Mark Jr.; Zai Fu Huang; Paul L. Bishop
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 510 KB
- Volume
- 289
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
A novel potentiometric selective determination method for hydrogen sulfide (HS-) by an electropolymerized membrane electrode based on a neutral anion carrier, binaphthyl-20-crown-6, has been developed. The potentiometric response is highly dependent on the pH of the solution and the nature of the buffer medium. The response of the polybinaphthyl-20-6 electrode to HS-has a linear dynamic range between 2 X lo-' and 2 x lo-' M with a "super-Nernstian" slope of about 110 mV/decade concentration and a detection limit of 6 x 10m8 M in phosphate buffer (0.1 M, pH 7.5). Other inorganic anions do not interfere with the determination of HS-and those interfering problems encountered by potentiometric sulfide ion selective electrode have been circumvented. The potentiometric response mechanism towards hydrogen sulfide (HS-1 is discussed and a mechanistic model of the electrode response is given.