采用分层采样技术对场地地下水污染物进行三维空间描述

Multi-layer sampling in contaminated sites for groundwater three-dimensional pollution description

地下水单一混合层采样所需建井及采样技术较简单,曾被广泛应用于地下水监测,但根据该技术所得地下水污染物数据进行污染场地地下水污染羽和污染程度描述,常常存在较严重的偏差。以某氯代烃污染场地为例,详细阐述了巢式监测井的建井及分层采样技术,并以该场地主要污染物氯乙烯和氯仿为例,对比了来自不同采样技术的两个主要污染物数据,证实了采用分层采样技术对污染场地地下水进行调查,具有更好的准确性和可靠性。

Single-layer sampling for groundwater have once been widely applied, due to the technologies of building well and sampling are simple, but based on the data from single-layer sampling, there are often serious deviation in the description about pollution plume and pollution degree. Taking a chlorinated hydrocarbon site as an example, the technologies of building well and sampling for nested monitoring well were elaborated, and the concentrations of chloroform and vinyl chloride from different samplin~ methods were contrasted. The results contirmed that the technology oi multi-layer sampling is more accurate and reliable in the groundwater investiga- tion.