Device for enriching semi-volatile organic compounds in underground water

Abstract

The invention discloses a device for enriching semi-volatile organic compounds in underground water. The device comprises a barrel which is provided with an overflow port and an emptying port, wherein the upper end of the barrel is provided with a water sample inlet; a water filter is assembled at a water sample inlet end; connecting rods are uniformly distributed on the barrel; a disc body with a water inlet pipe is arranged on each connecting rod in a penetrating way; the water inlet pipe is communicated with a sealing ring arranged under the disc body after passing through the disc body; an inlet at the upper end of the water filter is tightly matched with the sealing ring; an outlet at the lower end of the water filter is communicated with a backflow pipe fixedly connected to the barrel; and an outlet at the lower end of the backflow pipe is located at the bottom of the barrel. By using the device, the positive and negative enrichment of semi-volatile organic compounds in water under various hydrogeological conductions in field geological investigation can be realized, the sampling cost is reduced, the work efficiency is increased, the semi-volatile organic compounds are easy to store and transport and free of secondary pollution, substances to be detected are prevented from being lost in the operation process, and the recovery rate of the semi-volatile organic compounds is increased, for example, the recovery rate of the sampled phenanthrene in the detected underground water can be increased from 70% in the prior art to 90%.

Description

technical field [0001] The invention relates to a field enrichment device for groundwater semi-volatile organic matter. Background technique [0002] Due to the unreasonable disposal of "three wastes" and the unreasonable abuse of pesticides, fertilizers and other chemicals, the pollution of semi-volatile organic compounds in groundwater has become more and more serious, posing a serious threat to human survival and health. The status of organic pollution has become an urgent issue. The survey and evaluation of semi-volatile organic compounds is an important part of the nationwide investigation and evaluation of groundwater pollution. Semi-volatile organic compounds are trace pollutants, and their content in groundwater is generally μg / l or even ng / At level l, highly sensitive and specific analysis methods must be used to detect its content in groundwater, and the enrichment of semi-volatile organic compounds is a pretreatment process for detection, which is of great signi...

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Problems solved by technology

[0003] Through long-term work practice, it is found that the above process has the following problems: ①Since the sampling bottle is a glass bottle and is fragile, it must be re-sampled if it is broken during storage and transportation; The journey is far away, the sampling should be kept at low temperature, and at the same time, the sampling bottle must be prevented from breaking, resulting in high cryogenic storage and transportation costs; ③ To ensure the sampling pressure requirements, it takes a lot of energy and time to adjust the pressure, and it is easy to damage the water pump, making the sampling process difficult. Complicated; ④ The operation steps are cumbersome, which can easily cause large errors in the analysis and test results. If the glass sampling bottle enters the air, it must be re-sampled, resulting in waste of groundwater resources, sampling time and electric energy. This problem is lacking in arid and semi-arid Northwest areas. Especially prominent; ⑤ On-site sampling of glass bottles, and then long-distance transportation to the laboratory for solid-phase extraction. The biggest problem in this sampling process is the loss of target objects and secondary pollution of groundwater, which seriously affects the recovery rate and test results.

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