Table 2 Variables studied about water in specialised environmental health journals (2008–2017)
From: A glance at one decade of water pollution research in Iranian environmental health journals
Variables | Levels |
|---|---|
Water-related articles by journals | Number / percent |
Water-related articles by year of publication | Number / percent |
Sources of water | 1- Surface 2- Groundwater |
Types of pollutants by origin | 1- Primary pollutants 2- Secondary pollutants |
Physical variables | Classification by type |
Microbial agents | Classification by type |
Heavy metals | Classification by type |
Chemical pollutants | Classification by type |
Collaboration of researchers by country | Name of countries |
Collaborative research by continent | Name of continent |