Hydrochemical classification of ground waters in Northeast Bulgaria

The present paper deals with the regional classification of hydrochemical information on 341 water samples from different aquifers in Northeastern Bulgaria, the analysis of which is carried out in situ (pH, T, ^oC, CO₂, x) or by standard analytical methods for the other chemical ingredients. Modern methodology, based on multivaried methods for statistical (cluster and discriminant) analysis applying microcomputer technique, is used.