Synthesis and characterization of a 3-hydroxy-4-pyridinone chelator functionalized with a polyethylene glycol (PEG) chain aimed at sequential injection determination of iron in natural waters

Greener and wide applicability range flow-based spectrophotometric method for iron determination in fresh and marine water

“…Additionally, MRB13 has a simpler and cheaper synthesis meeting the requirements of green chemistry guidelines [7]. MRB13 reagent proved to have high affinity and specificity for iron [10,24], similar to other parent ligands, as no significant interferences were observed in the presence of other ions commonly present in natural waters (< 10%).…”

“…In the present work, the performance of MRB13 was compared with a parent ligand (MRB12) already referred by Mesquita et al as a chromogenic chelator for iron determination [10] in waters. For that purpose, the selected volumes for reagent, buffer and standard were those stated in the same reported work.…”

“…The volumes of aspiration of standard, buffer solution and MRB13 solution were also evaluated. First, the volume of 500 µL of sample/standard [10] was set, and then the results compared with those obtained with 550, 650 and 750 µL. No significant differences were observed in the slope of the calibration curve; however, a decrease of 16% in the intercept was observed when using the volumes of 650 and 750 µL.…”