Obretenov, Tz.

• Vol 11 (1974) - Original Articles
  STUDIES ON THE SORPTION PROPERTIES OF NATIVE SORBENTS. First report. Thermal Activation of Native Sorbents from North-Eastern Bulgaria for Rendering Innocuous the Nickel Ions from Industrial Sewage Waters
  Abstract  PDF
• Vol 11 (1974) - Original Articles
  CONCERNING METHYLENE BLUE SORPTION OVER ACID AND THERMALLY ACTIVIED KAOLIN IN ULTRASOUND FIELD
  Abstract  PDF
• Vol 11 (1974) - Original Articles
  ADSORPTION OF METHYLENE BLUE OVER SOME ACID AND THERMALLY ACTIVIED NATIVE SORBENTS IN ULTRASOUND FIELD
  Abstract  PDF