激光粒度仪转速对河流砂质沉积物测量的影响  

Impact of the Laser Grain-size Equipment Speed on Measuring River Arenaceous Sediment

作　　者：丁召静[1,2] 申洪源[1] 贾玉芳[1,2] 

机构地区：[1]临沂大学资源环境学院,山东临沂276005 [2]山东师范大学人口资源环境学院,济南250014

出　　处：《沉积学报》2012年第3期530-535,共6页Acta Sedimentologica Sinica

基　　金：国家自然科学基金(批准号:41072138);山东省自然科学基金(批准号:ZR2010DM020);临沂师范学院博士科研基金(批准号:BS07007)项目资助

摘　　要：激光粒度仪是沉积物粒度测量中常用的仪器,通过对河流沉积物的粒度测量发现,激光粒度仪的转速会影响粒度测量结果。实验结果表明:被测样品的颗粒易受撞击而破碎,激光粒度仪转速对样品遮光度有影响;转速太大会使大颗粒的破碎严重,转速太小又会导致样品颗粒不能均匀分散于溶液中,综合分析得出河流砂质沉积物应用Mastersizer 2000激光粒度仪测量的较适宜转速为1900～2000 r/min左右,且不宜加超声波震荡。The experimental results show that ：（1） the sediment particles are vulnerable to be broken because of the brunt.When the propeller of the laser grain-size equipment rotates quickly,larger particles would be broken to smalls with grain size of 32-87 μm,at the same time,the ultrasonic disaggregating of the laser grain-size equipment would also shatter the sediment particles;therefore,the ultrasonic disaggregating of the laser grain-size equipment should not be available.（2） The sample shading degree would be influenced by the rotate-speed of the laser grain-size equipment.During the test,we found that the slower rotational speed of the equipment,the less instability of the measure result.But with the slowing rotate-speed,the differences of the shading degree and blue light shading degree of the samples become bigger.The sample shading degree is mostly stable when the rotational speed of the laser grain-size equipment is 500 r/min,but the water power is so inadequate that the larger particles can＇t be pumped into sample injector,hence the sample shading degree is lower,and the differences of the shading degree and blue light shading degree of the samples become bigger.（3） It would contribute to more serious damage of large particles if the rotational speed is too fast,on the contrary,the low speed would lead the sediment particles not to disperse equably in the solution.Analyses that accounted for the stability of measure results,the sample shading degree,the grain size changes and content changes during the test shows that the appropriate rotational speed is about 1 900-2 000 r/min.So the comprehensive analysis can be concluded is that the appropriate rotational speed of Mastersizer 2000 laser particle analyzer is about 1 900-2 000 r/min for the river arenaceous sediment,and the ultrasonic disaggregating of the laser grain-size equipment should not be available.

关 键 词：转速 河流砂质沉积物 激光粒度仪 影响 

分 类 号：P512.2[天文地球—地质学]