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Product sheet
Particle Charge Detector
FEATURES
▪ Sample charge quantification through
polyelectrolyte titration
▪ Acid/base titration for pH dependency
determination of sample charge
▪ Compact and light for comfortable travelling
▪ Quick and easy setup
BENEFITS
▪ Shows the exact demand for chemical
additives for responsible resource deployment
▪ Identifies additive overdosages or wrong
reactions to save chemical additive costs
▪ Locates weak spots in water-based processes
to allow purposeful improvements
▪ Merges you with a team of GT application
and service experts around the world
GENERAL / BACKGROUND The Particle Charge Detectormeasures the charge of colloidal dissolvedsubstances in aqueous samples.In aqueous systems, solid particles as well ascolloidal dissolved substances carry electricalsurface charges, a phenomenon occurring insuspensions and emulsions. These charges influence the interaction of suspended and dissolvedmaterial with chemical additives. The charge of a sample is quantified through atitration with a polyelectrolyte of opposite charge. Forthis purpose, the features anintegrated titrator, that Particle Charge Detector can be configured with eitherone titration pump or withtwo titration pumps. Formanual titration or for the connection to an externaltitrator, the variant Light without integratedtitration pumps is available.Surface charged sample matter with a capability toaccept or donate H+ or OH- change their charge density depending on the pH. To reveal the relation between pH and charge, the can handle acid/base titrations to determine the iso-electric point (IEP) of a sample. In the paper industry, the equipment is a standard tool for detecting anionic trash levels but also for characterizing chemical additives. Identification of charge levels is not only very important for the paper industry but also for numerous other applications like waste water treatment, the food and beverage industry, ceramics, colors, textiles and pharmaceuticals.
Charged colloids and particles of a size > 1nm can attract oppositely charged ions from the surrounding water. Separating these so called counterions from the particle creates a measurable potential difference. If such ion separation is achieved through a liquid flow, the potential is called streaming potential with the unit mV.
After a sample has been filled into the Particle Charge Detector measuring cell, sample colloids (1) adsorb to the inner surfaces (2) of the measuring cell, while its attracted counterions (3) remain comparatively mobile. Driven by a motor, the displacement piston (4) creates an intensive liquid flow (5), which separates the counterions from the adsorbed sample material. At the electrodes built in the measuring cell, the counterions induce a current which is rectified and amplified electronically. A streaming potential with the appropriate sign is shown on the display. The integrated titrator recognizes the sign and automatically adds a polyelectrolyte of opposite charge and known concentration. The polyelectrolyte addition keeps going, until the end point (EP) of the titration is reached. This is the point of neutral charge (= 0mV), where all existing charges in a sample are neutralized. Out of the known titrant consumption required to reach the point of neutral charge, the charge content of the sample is calculated and displayed as measurement result.
APPLICATION EXAMPLES The equip is suitable for a wide range of applications in process control, process improvement and research, as for example in: PAPER Detection of anionic trash sources for a demandoriented dosage of fixatives. Charge characterization of chemical additives like sizing agents, wet strength agents, retention aids, pigments and their processability. PROCESS- & WASTEWATER TREATMENT Optimization of coagulants and flocculants applied in flotation units, for process water recovery or for the treatment of industrial and municipal wastewater. All solid-liquid separations achieved through charged additives are a potential use case for a measurement. It reveals the current additive demand to ensure a demand-oriented dosage. PIGMENTS Stability characterization of pigment dispersions like lacquers, wall colors, coating ceramics, textile colors or cosmetic fillers. The stability of pigment dispersions correlates directly to their charge at a certain pH value. Low or no charge destabilizes these dispersions and makes them at least difficult to process. CONSTRUCTION CHEMICALS Evaluation of the dispersing power and adsorption capability of additives and admixtures in cement, concrete, mortar and gypsum
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