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Table 3 Prediction of hardness values in water samples by the PLS model, from UV-vis spectra measurements, using EBT-CC

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

  Hardness (°F) Fit PLS (°F) e%
Tap water 13.5 11.5 − 14.8
SANGEMINI water diluted 2 times 43.5 47.6 9.4
SANGEMINI water diluted 4 times 21.9 23.1 5.4