Automatic system for sequential determination of free and total cyanide using homogeneous membrane tubular ion-selective electrode
| Autor: | Arilson Lehmkuhl, Reinaldo Carvalho Silva, Maria Angélica Bonadiman Marin, Roldão Roosevelt Urzêdo de Queiróz, José Bento Borba da Silva, Edgard Moreira Ganzarolli |
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| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | Química Nova v.23 n.1 2000 Química Nova Sociedade Brasileira de Química (SBQ) instacron:SBQ Química Nova, Volume: 23, Issue: 1, Pages: 23-29, Published: FEB 2000 Química Nova, Vol 23, Iss 1, Pp 23-29 (2000) |
| ISSN: | 0100-4042 |
| DOI: | 10.1590/s0100-40422000000100006 |
| Popis: | This study presents an automated system for potentiometric determination of free and total cyanide which employs a homogeneous membrane tubular ion-selective electrode. After the electrode is assembled, it is connected to a system composed of 3 three-way solenoid valves, sample line, carrier line, acid stream, and gas diffusion chamber. A Turbo Pascal® computer program, developed specifically for this task, automatically performs all the steps involved in data acquisition and processing. The proposed analytical procedure offers operational simplicity, since detection is performed by a tubular electrode, whose assembly is fast and easy. The system has shown reproducibility (r.s.d. < 0.5%, n=6) and high speed (30 readings/hour); it is efficient for determination of free and total cyanide in waste waters of starch processing plants. The detection limit was 1.2x10-5 and 1.5x10-5 mol L-1, for determination of free and total cyanide, respectively. The linear response range was between 1.2x10-5 and 1.0x10-2 mol L-1 for free cyanide and between 1.5x10-5 and 1.0x10-2 for total cyanide. |
| Databáze: | OpenAIRE |
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