Sensitive Potentiometric Method for Determination of Micromolar Level of Polyethoxylated Nonionic Surfactants in Effluents
| Autor: | Dubravka Madunić-Čačić, Milan Sak-Bosnar, Zorana Grabarić, Ružica Matešić-Puač |
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| Rok vydání: | 2007 |
| Předmět: |
Chromatography
General Chemical Engineering Potentiometric titration General Chemistry Condensed Matter Physics Industrial waste chemistry.chemical_compound NIO surfactant electrode polyethoxylated nonionic surfactant potenciometric titration detergent products waste water Pulmonary surfactant chemistry Standard addition Electrode Sodium tetraphenylborate Electroanalytical method Titration |
| Zdroj: | Tenside Surfactants Detergents. 44:11-18 |
| ISSN: | 2195-8564 0932-3414 |
| DOI: | 10.3139/113.100323 |
| Popis: | The Metrohm NIO surfactant electrode has been used as end-point indicator for potentiometric titration of low concentration level of polyethoxylated nonionic surfactants. This can be achieved by using of a diluted titrant concentration, thus reducing the amount of precipitate formed during titration and preventing the electrode deterioration. The solutions of low levels (down to 10−6 mol/L) of selected nonionic surfactants containing 5 to 23 EO groups were successfully titrated with diluted (as low as 10−4 mol/L) sodium tetraphenylborate as standard anionic titrant, increasing up to 20 times the sensitivity of the method. The low surfactant concentration has been determined in synthetic formulations of widely used detergent products and industrial waste waters. The titration end-point has been determined by applying extended Savitzky-Golay least-squares regression. The accuracy and precision has been evaluated by using the standard addition method. Relative standard deviation within results was between 3.4 and 12.8 % depending on the sample complexity and the surfactant concentration level. |
| Databáze: | OpenAIRE |
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