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29.

Advantages and disadvantages of the above methods

-Microscope Imaging A: simple, direct test procedure, shape analysis available D: long test cycle, relatively poor representation, testing of ultra fine particles not possible -Sieve Analysis A:simple, direct test procedure, low cost D:samples smaller than 40um can not be tested; test results are subject to deformation of sieve meshes -Sedimentation A:low price, continuous operation, high degree of accuracy and repeatability, relatively broad test range D:long test cycle -Coulter A:easy operation short testing cycle, relatively high accuracy D:narrower size range, easily blocked apertures, electric conductivity of medium necessary -Laser diffraction A:easy operation, broad test range, high degree of accuracy and repeatability on-line test and dry test available. D:test results are subject to distribution pattern, high cost of instrument -Electron Microscope A:capable of measuring particles of nanometer size, high resolution D:possible alternation of particles during sample preparation, small representation of overall sample, and high cost -Ultrasonic A:direct test on highly concentrated liquid D:low resolution -Gass absorption A:low cost of instrument, sample dispersion not an issue, testing on magnetic powders capable D:only average particle size available, particle size distribution unobtainable

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