Field enrichment device for volatile organic compounds in underground water

Abstract

The invention relates to a field enrichment device for volatile organic compounds in underground water, belonging to the technical field of environmental monitoring. The enrichment device comprises an upper tank body and a lower tank body connected in a threaded connection manner, wherein a vertically communicated first sample injection hole, a gas inlet hole and a gas outlet pipe are arranged on the upper tank body; a second communicated sample injection hole is formed in the lower tank body; and a drying device and an adsorption device are arranged in the gas outlet pipe. The operating method of the device comprises the following steps: immersing the enrichment device in a sampling water body in a rope tying or handheld manner, introducing nitrogen via the gas inlet hole after the water body sample is completely collected, drying organic matters in the drying device, adsorbing the organic matters by the adsorption device, and finishing the collection process. According to the enrichment device, loss of the volatile organic compounds in the collection process and sample transfer process can be avoided, the organic matters in the samples are completely collected, the detection result is closer to the true situation, the reference property can be greatly improved, and the device is applied to be popularized and applied in related fields.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring, and relates to a volatile organic pollutant enrichment device, in particular to a field enrichment device for volatile organic pollutants in groundwater. Background technique [0002] In geological field investigation work, the investigation of volatile organic pollutants is an important content for the investigation of groundwater and surface water pollution. When sampling and testing volatile organic pollutants in groundwater and surface water in the field environment According to different environments and different sampling matrices, collection and preservation have quite strict and detailed regulations to ensure the success of collection and preservation. For example: 1. The requirements for the collection and preservation of volatile organic compounds in the geological survey technical standard of the China Geological Survey "DD2008-01 Groundwater Pollution Geological Surve...

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Problems solved by technology

[0003] To sum up, the sampling and storage of water samples stipulated in the relevant specifications have the following disadvantages: (1) In the water sample collection step, there are various types of samples. For different types of samples, such as sampling includes tap sampling and open water sampling, Samples include samples containing residual chlorine and samples without residual chlorine, which makes the sampling procedure complicated and greatly increases the probability of wrong operation; Sampling in a representative area, and then pouring the water sample from the jar or beaker into the sample bottle, the above operation process will easily cause the volatile organic pollutants dissolved in the water sample to volatilize and lose, thereby reducing the recovery rate; (3 ) Water samples are stored in glass bottles and stored at low temperature. During transportation, they need to be prevented from being broken and transported at low temperature. In this way, there are disadvantages such as difficult sample storage and high transportation costs; (5) Water samples need to be tested before sampling. Open the sample bottle and transfer it to the sample bottle or sample tank again. During the opening and transfer process of the sample bottle, volatile organic compounds will inevitably be volatilized and lost, which will seriously affect the recovery rate.

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