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Table 5 Prediction of Co(II), Ni(II), and Zn(II) values in four commercial oligomineral supplements by the PLS model, from UV-vis spectra measurements, using PAN-CC

From: Low-cost, disposable colourimetric sensors for metal ions detection

Fisiosol® cd (mg/2 mL) cd (mM) cm (mM) e%
Co(II) 0.0726 0.616 0.55 (1) − 11
Ni(II) 0.0726 0.618 0.68 (9) 10
Zn(II) 0.0674 0.515 0.48 (8) − 7
Oligosol® cd (mg/2 mL) cd (mM) cm (mM) e%
Co(II) 0.0726 0.616 0.54 (8) − 12
Ni(II) 0.0726 0.618 0.7 (2) 13
Zn(II) 0.0674 0.515 0.45 (1) − 13
Catalitic® cd (mg/2 mL) cd (mM) cm (mM) e%
Co(II) 0.062 0.526 n.d. /
Ni(II) 0.088 0.750 0.8 (7) 6
Zn(II) 0.314 2.4 2.1 (4) − 13
Gammadyn® cd (mg/2 mL) cd (mM) cm (mM) e%
Co(II) 0.073 0.619 n.d. /
Ni(II) 0.073 0.622 0.6 (3) − 3
Zn(II) 0.067 0.512 0.5 (3) 1
  1. cd concentration declared on the packaging, cm concentration predicted by the PLS model