Research Article
Modification of Nanoclinoptilolite Zeolite with Hexadecyltrimethylammonium Surfactant as an Active Ingredient of Chromate-Selective Membrane Electrode
Table 7
Comparison of some potentiometric characteristics of the chromate ISE described in this paper with previously published reports.
| Interference ions | Log values in the references | This paper | [41] | [7] | SSM | FIM |
| CN− | — | — | 0.2 | −3.2 | Cl− | −1.4 | −2.9 | 2.5 | −1.8 | I− | — | −1.8 | 1.6 | −3 | | −1.5 | −4.0 | −2.8 | −2.9 | | −1.4 | −2.1 | −0.2 | −3.2 | | −1.6 | −2.6 | −1.3 | −3.1 | | −1.9 | −1.8 | −1.5 | −3.0 | | −1.6 | −2.4 | −1.2 | −1.9 | Sala | — | −2.3 | −1.5 | −3.0 | OAc− | — | −3.2 | 1.8 | −2.3 | D.L. (p Chromate) | 5.9 | 6 | 5.7 | D.R. (p Chromate) | 1–5.3 | 1–5.6 | 2–5.3 | Response time (s) | 13 | 20–25 | 5–10 | Stability (day) | 300 | 60 | 60 | pH rangeb | 6.5–10.0 | 8.0–12.0 | 6.8–10.7 | Slope (mV·decade−1) | −29.0 | −28.8 | −29.4 | Conditioning time (h) | — | — | 2 | Standard deviation | 0.2 | 0.5 | 0.29 |
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Salicylate. The pH range of the electrode response is independent of pH.
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