New and low cost plastic membrane electrode with low detection limits for sulfadimethoxine determination in aquaculture waters

• Type: Article in International Scientific Journal
• Date: 2013

Authors

Almeida, SAA (Author) Other; Montenegro, MCBSM (Author) FFUP; Sales, MGF (Author) Other

Journal

Title: Journal Of Electroanalytical Chemistry

Vol. 709

Pages: 39-45

ISSN: 1572-6657

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 7 Citations

Scopus - 13 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-008-G3C

DOI: 10.1016/j.jelechem.2013.09.029

Abstract (EN): Sulfadimethoxine (SDM) is one of the drugs, often used in the aquaculture sector to prevent the spread of disease in freshwater fish aquaculture. Its spread through the soil and surface water can contribute to an increase in bacterial resistance. It is therefore important to control this product in the environment. This work proposes a simple and low-cost potentiometric device to monitor the levels of SDM in aquaculture waters, thus avoiding its unnecessary release throughout the environment. The device combines a micropipette tip with a PVC membrane selective to SDM, prepared from an appropriate cocktail, and an inner reference solution. The membrane includes 1% of a porphyrin derivative acting as ionophore and a small amount of a lipophilic cationic additive (corresponding to 0.2% in molar ratio). The composition of the inner solution was optimized with regard to the kind and/or concentration of primary ion, chelating agent and/or a specific interfering charged species, in different concentration ranges. Electrodes constructed with inner reference solutions of 1 x 10(-8) mol/L SDM and 1 x 10(-4) mol/L chromate ion showed the best analytical features. Near-Nernstian response was obtained with slopes of -54.1 mV/decade, an extraordinary detection limit of 7.5 ng/mL (2.4 x 10(-8) mol/L) when compared with other electrodes of the same type. The reproducibility, stability and response time are good and even better than those obtained by liquid contact ISEs. Recovery values of 98.9% were obtained from the analysis of aquaculture water samples.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7