Abstract
In this work, a flow injection system for the potentiometric determination of nitrate content in waters, is described. A tubular nitrate ion-selective electrode without inner reference solution and an ion-exchanger system composed of (4,7-diphenylphenanthroline)nickel (II) nitrate in o-nitrophenyl octyl ether was used as indicator electrode. These units were evaluated In two ionic strength adjustor solutions and their operational characteristics compared with those of conventionally shaped electrodes with the same sensor system. The developped methodology allows the determination of nitrate anion in waters without sample pre-treatment and with a high sampling rate (ranging from 60 to 120 determinations per hour) and precision (relative standard deviations inferior to 2%). Results are in good agreement with the reference procedure and the lower limit of linear response is 14.9 mg L-1.
| Original language | Portuguese |
|---|---|
| Pages (from-to) | 82-88 |
| Number of pages | 7 |
| Journal | Revista Portuguesa de Farmácia |
| Volume | 46 |
| Issue number | 2 |
| Publication status | Published - 1 Dec 1996 |
Keywords
- Flow injection analysis
- Nitrate
- Waters
- Ion-selective electrode