• SurPASS 3 & ISO 13100 Compliance

Laboratory Products

SurPASS 3 & ISO 13100 Compliance

Apr 23 2024

In March 2024, the new ISO standard titled ‘Methods for zeta potential determination – Streaming potential and streaming current methods for porous materials’ was published. This standard describes the method of streaming potential measurement. The latter forms the basis of Anton Paar’s measuring instrument SurPASS 3.

The standard specifies methods for the zeta potential determination in porous materials that are saturated with a liquid where the pores are readily accessible. There is no restriction on the value of the zeta potential, nor on the porosity of the porous material. A pore is assumed to be on the scale of hundreds of micrometres, or smaller, without any restriction on pore geometry.

The document covers the applications of alternating current (AC) and direct current (DC) methods using aqueous media such as wetting liquids. This effectively makes the SurPASS 3 the standard to measure zeta potential in porous materials.


The SurPASS 3 features fully automated zeta potential analysis of macroscopic solids under real-life conditions. As an electrokinetic analyser, it employs the classic streaming potential and streaming current method for a direct analysis of the surface zeta potential. The zeta potential is related to the surface charge at a solid/liquid interface, and is a key parameter for understanding surface properties and developing new specialised materials.

What SurPASS 3 brings to the table:

  • More than 15 elaborate measuring cells that accommodate samples of various geometries, ranging from powders and fibres to planar solids
  • Liquid-on-solid surface adsorption kinetics can also be followed in real-time on model surfaces and on your actual sample
  • Automated pH scan and detection of the isoelectric point

More information online

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Lab Asia 31.2 April 2024

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