Identification of Natural Mineral Waters of Vladimir Region by the Colorimetry of Indicator Papers Using a Smartphone

A test device based on cellulose paper for the identification and classification of natural mineral waters of the Vladimir region, containing indicator zones for determining the total hardness, as well as the alkalinity and pH of water, and the concentrations of chlorides and sulfates. The colorimetric parameters of the indicator zones of the test device after contact with the test water are determined using a smartphone. The values of the colorimetric parameters of each indicator zone in the RGB system are used as the analytical signal. The data set is processed by the principal component analysis (PCA) and hierarchical clustering analysis (HCA). Thirteen natural mineral waters of the Vladimir region (7 of them carbonated) are identified and classified.