TY - JOUR
T1 - Micro solid phase spectrophotometry in a sequential injection lab-on-valve platform for cadmium, zinc, and copper determination in freshwaters
AU - Santos, Inês C.
AU - Mesquita, Raquel B. R.
AU - Rangel, António O. S. S.
PY - 2015/9/3
Y1 - 2015/9/3
N2 - This work describes the development of a solid phase spectrophotometry method in a μSI-LOV system for cadmium, zinc, and copper determination in freshwaters. NTA (Nitrilotriacetic acid) beads with 60-160 μm diameter were packed in the flow cell of the LOV for a μSPE column of 1 cm length. The spectrophotometric determination is based on the colourimetric reaction between dithizone and the target metals, previously retained on NTA resin. The absorbance of the coloured product formed is measured, at 550 nm, on the surface of the NTA resin beads in a solid phase spectrophotometry approach. The developed method presented preconcentration factors in the range of 11-21 for the metal ions. A LOD of 0.23 μg L-1 for cadmium, 2.39 μg L-1 for zinc, and 0.11 μg L-1 for copper and a sampling rate of 12, 13, and 15 h-1 for cadmium, zinc, and copper were obtained, respectively. The proposed method was successfully applied to freshwater samples.
AB - This work describes the development of a solid phase spectrophotometry method in a μSI-LOV system for cadmium, zinc, and copper determination in freshwaters. NTA (Nitrilotriacetic acid) beads with 60-160 μm diameter were packed in the flow cell of the LOV for a μSPE column of 1 cm length. The spectrophotometric determination is based on the colourimetric reaction between dithizone and the target metals, previously retained on NTA resin. The absorbance of the coloured product formed is measured, at 550 nm, on the surface of the NTA resin beads in a solid phase spectrophotometry approach. The developed method presented preconcentration factors in the range of 11-21 for the metal ions. A LOD of 0.23 μg L-1 for cadmium, 2.39 μg L-1 for zinc, and 0.11 μg L-1 for copper and a sampling rate of 12, 13, and 15 h-1 for cadmium, zinc, and copper were obtained, respectively. The proposed method was successfully applied to freshwater samples.
KW - Freshwaters
KW - Metal ions
KW - Multi-parametric determination
KW - Sequential injection lab-on-valve
KW - Solid phase spectrophotometry
UR - http://www.scopus.com/inward/record.url?scp=84941874268&partnerID=8YFLogxK
U2 - 10.1016/j.aca.2015.08.021
DO - 10.1016/j.aca.2015.08.021
M3 - Article
C2 - 26388376
AN - SCOPUS:84941874268
SN - 0003-2670
VL - 891
SP - 171
EP - 178
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
ER -