Development of a Low-Cost UV-Vis Spectrophotometer and Its Application for the Detection of Mercuric Ions Assisted by Chemosensors. - David F. González-Morales; Asmilly Valencia; Astrid Díaz-Nuñez; Marcial Fuentes-Estrada; Oswaldo López-Santos; Olimpo García-Beltrán (Sensors, 2020)