1. The importance of natural organic material for environmental processes in waters and soils (Technical Report)
2. 3. C. Reimann and P. de Caritat, “Chemical Elements in the Environment, Factsheets for the Geochemist and Environmental Scientist”, 1998, Springer, Berlin.
3. 4. DR/2400 Portable Spectrophotometer, Hach, Loveland, CO, USA, 2003.
4. 5. Ion Selective Pack Test WAK-Fe(D), Kyoritsu Chemical Check Lab. Co., Japan, 2001.