The optimal condition for particle size detection of ion exchange resins by laser diffraction method was determined

namely:single peak model

shading degree between 10% and 20%

wet sampling

and with no ultrasonic treatment.The measurement results were compared with that by GB/T 5758—2001 screening method

and showed that these two methods had no significant difference.This laser diffraction method has good measurement repeatability and precision

and can be applied to particle size analysis for ion exchange resins in power plant.