Information subsystem of the SO4/Cl ratio as database for studying its influence on human health.

General lack of surface waters in the Dalmatian region on one hand (Croatia) and a large profusion and complexity of underground waters circulation, on the other hand, are typical phenomena of Dalmatian Karst region. Underground waters in Dalmatia belong to rift water similar to surface waters considering its hydrochemical and hygienic characteristics. Health care institutions and water authorities have become particularly interested in observing and monitoring water as well as preserving its quality. A relational database has been developed for carrying out chemical analyses expressed by the SO4/Cl ratio since it is necessary to organize and integrate a large number of analytical and ecological health-data. The database can serve as a methodological platform for the study of environmental factors influencing human health. The prototype database consists of data obtained by investigations, which have been conducted by the Water Examination Department of the Public Health Institute of Split Dalmatian County (Croatia) and University of Split Medical School. The database currently contains more than 3000 data.