Fig. 3From: Smartphone based colorimetric point-of-care sensor for abused drugs: case of baclofen determination in urineEffect of colorimetric reaction parameters on the product absorbance of 0.14 mmol L−1 BAC at 470 nm: a Reaction time, b Reagent volume, c Medium pH, d pH modifier volume, e Order of addition and f Stability of the colored solution ready for measurementBack to article page