离心和沉降两种采样方式下平原河网水系监测数据对比及差异分析

指出了平原河网水系直观的表现就是透明度低、悬浮物较多,悬浮物对部分水质项目的分析有较大影响。研究了离心和沉降2种采样方式对此类河网断面比对监测的数值差异及差异原因,为国家和地方标准制订部门提供数据参考。结果表明:悬浮物的量对总磷、化学需氧量、高锰酸盐指数的分析结果影响较大,对氨氮的分析结果影响较小;从水质类别变化来看,通航断面差异明显,离心较沉降水质低2个类别的断面占8%,低1个类别的断面占32%,高1个类别的断面占4%;不通航断面基本无差异,离心较沉降水质高1个类别的断面占7.7%。

Comparison of Monitoring Data of Plain River Network by Centrifugal and Subsidence Sampling Methods and Analysis of Reasons for Differences

The intuitive manifestation of plain river network is low transparency and more suspended solids.Suspended solids have great influence on the analysis of some water quality projects.This paper studies the numerical differences and causes of the differences between centrifugal and subsidence sampling methods in monitoring the cross-section ratio of such River network,and provides data reference for national and local standard-making departments.The results show that the amount of suspended solids has great influence on the analysis results of total phosphorus,chemical oxygen demand and permanganate index,but little influence on the analysis results of ammonia nitrogen.From the change of water quality categories,there are obvious differences in navigable sections,8%of the sections with lower centrifugal water quality than those with lower sedimentation water quality,32%of the sections with lower one category and 4%of the sections with higher one category.The centrifugal section is 7.7%higher than the sedimentation section.