These are all International Standards (ISO) related to particle size analysis and measurement of electrical properties in colloidal systems. ISO 13319-1:2021 specifies a method for determining particle size distribution using the electrical sensing zone method, while ISO 13317-3:2001 describes a method using X-ray gravitational technique. ISO 13099-2:2012 outlines methods for measuring electrophoretic mobility of particles in liquid, which is related to zeta potential.
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