Continuous in Situ Cyanide Monitoring Using a Highly Sensitive and Selective FIA System
| Autor: | Yoshiko Arikawa, Takuo Akimoto, Kenji Hayashi, Hong-Seok Ji, Kaori Nagakubo, Yoko Nomura, Scott McNiven, Isao Karube, Atsushi Watanabe |
|---|---|
| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | Environmental Science & Technology. 34:2618-2622 |
| ISSN: | 1520-5851 0013-936X |
| DOI: | 10.1021/es991039a |
| Popis: | A flow injection analysis (FIA) system incorporating a gas-diffusion membrane was fabricated for the detection of cyanide anion in aqueous samples. The principle of measurement is based on the reaction of o-phthalaldehyde (OPA) and cyanide in the presence of glycine to produce a fluorescent isoindole derivative. The cyanide concentration of the samples is thus proportional to the observed fluorescence intensity. Although extremely low levels of cyanide could be determined using this system (lower detection limit 0.4 ng mL-1 of CN-), measurements were affected by the presence of sulfite ion and thiols. Therefore, a gas-diffusion membrane was incorporated into the system to separate gaseous hydrogen cyanide from interferents in the sample. Consequently, this system displayed high selectivity for cyanide. The presence of sulfite ion (1 μg mL-1), 2-mercaptoethanol (0.1 μg mL-1), or 2-mercaptopropionic acid (10 μg mL-1) did not significantly increase the fluorescence intensity of cyanide solutions (16 ng mL-1)... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|