应用多元线性回归法测定黄河口不同粒径悬浮物中的有机碳含量

Application of Multiple Linear Regression in Studying Particulate Organic Carbon Content in Size-fractioned Total Suspended Solids in Huanghe Estuary

悬浮颗粒物(TSS)粒径与颗粒有机碳(POC)含量的关系研究,是河口淡、咸水混合过程中有机碳形态变化及其输送过程和输运通量研究的基础。在沉降法分级的基础上,结合激光粒度仪粒度测定,用多元线性回归分析法处理所得数据,校正了由于沉降分级的粒径交错现象而导致POC测定中小粒径TSS的POC含量偏低、大粒径TSS的POC含量偏高的问题,获得了样品中不同粒径TSS的POC含量。实验发现,黄河口水体中POC含量随TSS粒径的增加显著递减,80%以上的颗粒有机碳集中在<16μm的TSS中,而粒径<32μm的悬浮物承载了95%以上的颗粒有机碳的入海量。

The relationship between grain size of total suspended solids and particulate organic carbon content is the base of studying particulate organic carbon （ POC ） in fresh-salt water in estuary. The POC content in size-fractioned total suspended solids in Huanghe estuary were studied by multiple linear regression. The prob- lem resulted by conventional methods can be conquered the method. The results indicated that the weight percentage of particulate organic carbon is decreased remarkably with the increasing of the grain size of TSS. More than 80% of POC were concentrated in the fine particles （ 〈 16 μm） while over 95% of POC were concentrated in particles of size 〈 32 μm.