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School of Chemical and Environmental Engineering

Now offering two distinct diplomas: Chemical Engineering and Environmental Engineering

Aquatic Chemistry


School Chemical and Environmental Engineering
Course Level Undergraduate
Direction Environmental Engineering
Course ID ENVE 345 Semester 5th
Course Category Required
Course Modules Instruction Hours per Week ECTS
Lectures and Tutorials 3
Th=2, E=1, L=0
Course Type Scientific Area
Instruction/Exam Language Greek
The course is offered to Erasmus students No
Course URL https//   (in Greek)



Learning Outcomes

This course details the quantitative treatment of chemical processes in aquatic systems such as lakes, oceans, rivers, estuaries, groundwaters, and wastewaters. It includes a brief review of chemical thermodynamics that is followed by discussion of acid-base, precipitation-dissolution, coordination, and reduction-oxidation reactions. Emphasis is on equilibrium calculations as a tool for understanding the variables that govern the chemical composition of aquatic systems and the fate of inorganic pollutants.

Upon successful completion of this course the students will acquire new knowledge and specific skills on the following subjects:

  • To solve chemical thermodynamic equations and to determine the speciation of aqueous solutions of acids, bases, and minerals
  • To construct pH diagrams and titration curves, and solve the Proton Balance, Electroneutrality, and Mass Balance Equations for the speciation of solutions of acids, bases, and minerals
  • To determine the solubility of dissolved carbon dioxide, mineral salts, and metal oxides, hydroxides, and carbonates
  • Predict the behavior of environmentally important inorganic components under typical environmental conditions.
  • Apply knowledge of the behaviors of individual components in a system to explain real-world aquatic environmental systems
  • Discuss how the presence of individual species, and their interactions, will affect the overall chemistry of a complex environmental system
General Competencies/Skills
  • Review, analyse and synthesise data and information, with the use of necessary technologies
  • Decision making


  1. Global-Biogeochemical Cycles, Determination of the pH of natural waters.
  2. Carbonate equilibrium/balance. Chemicals in solution.
  3. Buffers and neutralizing capacity.
  4. Composition of natural waters.
  5. Mass Law-Determination of equilibrium constants. Chemical activity and ionic strength.
  6. ‘Fate’ of metals in the environment.
  7. Hydrolysis and complexation of metals.
  8. Activity of inorganic ligands. Competitive substitution.
  9. Interaction of aqueous solutions with sediments and soils, Solubility and adsorption, Effect of chemicals on solubility.
  10. Formation of Surface Complexes.
  11. Redox Geochemistry. Heterogeneous reactions and cycles.
  12. Reduction equilibrium, capacity and redox titrations (pE scale).
  13. Applications of environmental geochemistry.


Lecture Method Direct (face to face)

Use of Information and Communication Technology

  • Power point presentations
  • E-class support
Instruction Organisation Activity Workload per Semester
- Lectures 26
- Tutorials 13
- Autonomous study 61
Course Total 100

Assessment Method

Ι) Written final examination (100%):
- Questions of theoretical knowledge.
- Theoretical problems to be resolved.


  • Aquatic Chemistry: Chemical Equilibria and Rates in Natural Waters, Werner Stumm, James J. Morgan
  • Water Chemistry, Vernon L. Snoeyink, David Jenkins


Course Instructor: Professor E. Psillakis (Faculty - ChEnvEng)
Lectures: Professor E. Psillakis (Faculty - ChEnvEng)
Tutorial exercises: Professor E. Psillakis (Faculty - ChEnvEng)
Laboratory Exercises: