TITRATION METHODS

PURPOSE AND APPLICATION OF METHODS

• characterization of surface properties of different materials
• research of adsorption mechanism, reactivity of materials
• investigation of material behaviour in polar medium

DETERMINATION OF:		APPLICATION:
• • • • •	equivalent point of reaction charge density and surface potential concentration of solution dissociation constant of surface groups (pk values) dissociation group content	• • • • • • • •	textile industry food industry paper industry microbiology, pharmacy determination of water, moisture tribology control of water purity elementary, processing analysis

 

 

 

 

CONDUCTOMETRIC TITRATION

PRINCIPLE:
• • •	using the ability of substances in dissociation form to conduct an electric current practical determination of conductivity: measuring resistance and the dimension of conductivity cell (Ohm law) characteristic profile of conductometric titration is titration curve; which is represented by the reciprocal measured resistance and the volume of added titrant

 

APPLICATION AREAS:
• • • •	purity check of bodies in water purity check of non - aqueous solutions concentration determination monitoring of baths and wastewater

 

 

POTENCIOMETRIC TITRATION

PRINCIPLE
• • • •	scheme of galvanic cell: reference electrode // solution (c=?) // sensing electrode the resulting potential of galavanic cell EMF (so called electromotive force) is given by the difference between the potential of the both two electrodes the potential of single electrode depends on the ionic concentration of the solution (Nernst equation) characteristic profile of potentiometric titration is titration curve, which illustrates the qualitative progress of a titration. Measured potential signal is a function of the titrant volume. This representation can be used for the graphical determination of equivalence point

 

 

 

 

 

 

• • •	APPLICATION AREAS quality and quantity determination of different chemical elements determination of acid and base number investigation of redox, precipitation, complexometry reactions,…

 

 

 

 

 

 

 

 

 

POLYELECTROLYTE TITRATION

PRINCIPLE
• • •	polymer adsorption on a negatively charged material surface and the excess of cationic polyelectrolyte will be titrated with anionic polyelectrolyte adsorbed amount is proportional to surface charge characteristic profile of polyelectrolyte titration is adsorption isotherm, which describe that adsorbed amount of polymer is a function of the equilibrium concentration of polymer

 

 

APPLICATION AREAS
• • • •	investigation of delignification process acid - base interactions between cellulose and organic molecules surface characterization of fibres amount of charge on the fibres,...