Morphological, Opto-Electrochemical, and Sensing Proprieties of a Mixed Isopolymolybdate [Eu(dmso)8][Eu(η2-NO3)2(dmso)4(α-Mo8O26)0.5][Mo6O19] for Sulfaguanidine Detection

Environmental pollution and human health problems, caused by antibiotics abuse, require detection techniques development. The present review presents a photoelectrochemical impedimetric sensor for sulfaguanidine (Sg) determination. The recognition component is a mixed isopolymolybdate [Eu(dmso)8][Eu(η2-NO3)2(dmso)4(α-Mo8O26)0.5][Mo6O19] (I). The proposed sensor was constructed by ITO surface functionalization by polymeric thin film of poly(allylamine hydrochloride (PAH) and subsequently coated using (I). Scanning electron microscopy (SEM) and contact angle (CA) characterizations greatly confirm the successful immobilization of the sensing thin film. The electrochemical sensor has been able to detect Sg in the range from 10−11 to 10−5 M. In darkness, it has showed dynamic linear range from 10−11 to 10−7 M with a calculated limit of detection (LOD) was 1.1 × 10−12 M. By applying photonic excitation, it has presented a wider linear photoelectrochemical response to Sg ranging from 10−11 to 10−5 M with a reduced LOD of 1.2 × 10−13 M. It is gratifying that interferences with different and similar structure have had no significant interference on Sg determination. Furthermore, it has exhibited excellent regeneration (RSD = 2.2%, n = 6), repeatability (RSD = 3.8%, n = 6) as well as high reproducibility (RSD = 1.9%, n = 6).