沉积物自动粒径分析设备,包括ZSC-1型自动砂粒分析仪及GDW-1型光电微粒分析仪。二者均以沉降原理为基础,所测为沉降粒径,根据不同粒径颗粒在静水中沉降速度的大小,前者用以测定沉积物的中砂(2.0—0.063毫米),后者主要用以测定粉砂(0.063—0.004毫米)的粒径分布。没有现在常用的筛析法(所测为“筛分粒径”)及吸管法(所测为“沉降粒径”)所测粒 Sediment automatic particle size analysis equipment, including ZSC-1 automatic sand analyzer and GDW-1 optical particle analyzer. Both are based on the sedimentation principle and are measured as the sedimentation particle size, which is used to determine the sediment medium sand (2.0-0.063 mm) based on the sedimentation velocity of the particles in different sizes, The particle size distribution of the silt (0.063-0.004 mm) was determined. There is no commonly used sieve method (measured as “sieved particle size”) and pipette method (measured as “settled particle size”)