González, AlbaMesquita, Raquel B. R.Avivar, JessicaMoniz, TâniaRangel, MariaCerdà, VíctorRangel, António O. S. S.2017-07-312017-07-312017González, A., Mesquita, Raquel B.R., Avivar, J., Moniz, T., Rangel, Maria, Cerdà, V. & Rangel, António O.S.S. (2017). Microsequential injection lab-on-valve system for the spectrophotometric bi-parametric determination of iron and copper in natural waters. Talanta, 167, 703-708. doi: 10.1016/j.talanta.2017.02.0550039-9140http://hdl.handle.net/10400.14/22692The determination of iron and copper exploiting a microsequential injection lab-on-valve system with online spectrophotometric detection is described. A new, environmental friendly 3-hydroxy-4-pyridinone chelator, functionalized with a polyethylene glycol chain (MRB12) to improve water solubility, was used for iron determination. For copper determination, 1-(2-pyridylazo)-2-naphthol (PAN) was used. Different parameters affecting the formation of the complexes were studied, namely sample volume, reagent concentration, and buffer composition and concentration. The optimized conditions, 150 mu L of sample volume and 250 mg L-1 of MRB12 for iron determination, and 200 mu L of sample and 120 mg L-1 of PAN for copper determination, enabled an LOD of 15 and 18 mu g L-1 for iron and copper, respectively. The robustness of the developed procedure was assessed by the calculation of the relative standard deviation (RSD), 5% for iron determination and 2% for copper determination. The accuracy of the method was assessed comparing the results with two certified samples (RD < 7.5%) and calculating recovery percentages with five river water samples (average < 107%).engBi-parametric determinationPEGylated 3-hydroxy-4-pyridinone1-(2-pyridylazo)-2-naphtholWater analysisIron and copperjournal article10.1016/j.talanta.2017.02.0551873-35738501419671828340782000399511600089