A passive leachate collector suitable for pops detection in soil

Abstract

The invention discloses a passive leachate gatherer for detection of POPs in soil. The passive leachate gatherer comprises a passive soil leachate gathering warehouse and a POPs enrichment and extraction system. The leachate gathering warehouse comprises a Teflon sheath, a porous water inlet, a gathering warehouse and a ground sheath. The enrichment and extraction system comprises a SPE extracting tube, a syringe needle, a filter flask and a vacuum pump. The bottom of the gathering warehouse is provided with the Teflon sheath, the top of the gathering warehouse is provided with the ground sheath, and the central section of the gathering warehouse is equipped with the porous water inlet. The gathering warehouse is connected to the SPE extracting tube, the bottom of which is provided with the syringe needle. The syringe needle passes through a bottleneck rubber plug of the filter flask. The filter flask is connected to the vacuum pump. The porous water inlet is provided with three layers of filter membranes, which are successively a glass fiber filter membrane, a teflon millipore filtration interlayer and a stainless steel mesh supporting layer from the inside to the outside. The passive leachate gatherer provided by the invention is suitable for gathering POPs in a leachate in different environments. The device is reasonably designed, has a simple manufacturing technology, is low-cost, is convenient to operate, and is efficient and durable.

Description

technical field [0001] The invention relates to the field of water sample collection and testing, in particular to a passive leachate collector suitable for detecting POPs (Persistent Organic Pollutants, persistent organic pollutants) in soil. Background technique [0002] Soil leachate is water that exists in soil voids or adsorbed on soil particles. It is distributed in the soil layer from below the ground surface to above the water table. It is an important material component of the soil and an important material basis for plant growth and development. The composition of leachate is closely related to the physical and chemical properties of soil. As an important part of the water cycle and an important medium of the geochemical cycle, soil leachate is not only an important part of plant nutrition research, but also a research hotspot for agricultural product safety and environmental risk prediction. The collection of leachate is the basis of related research. [0003] L...

AI Technical Summary

Problems solved by technology

However, due to the limitation of the soil leachate sampling method at present, a large amount of loss and content changes of the target components in the soil leachate are often caused during the sampling process. Therefore, a convenient, effective and low-loss soil leachate sampling device and method research is particularly important and urgent

[0004] In recent years, there have been many patents on soil moisture collection, such as a series of patents with application numbers 200520110649.5, 201210297704.0, 200920043587.9, etc. However, phenomena such as sediment clogging and sampler sticky walls during the sampling process have always been troubled by soil leachate collection. However, the soil leachate collection device that can prevent sediment silting and reduce the wall viscosity of the sampler is rarely reported

Although researchers have proposed a series of leachate collection devices with their own characteristics in recent years, such as the invention patent application number 201220108225.5, this device can automatically record the seepage volume of the seepage pool and quantitatively collect the sample water volume, and can collect the leachate multiple times in a scientific and reasonable manner. Soil moisture samples are leaked and packed in different collection bottles, which saves a lot of manpower, material resources and financial resources, but the device also has disadvantages such as complex structure and high cost.

[0005] In addition, most of the above-mentioned patents are active soil leachate collection devices. Although the sampling rate is fast, they cannot accurately reflect the in-situ characteristics of soil leachate, especially to reproduce the concentration of persistent organic pollutants in soil that are concerned in environmental research. Migration and transformation rules and characteristics

Moreover, in general leachate collection systems, especially when clay heads are used as leachate collection bins, almost all persistent organic pollutants are adsorbed on clay heads and cannot be detected in leachate. Therefore, traditional soil infiltration Filtrate collectors cannot be used for the collection and detection of persistent organic pollutants in leachate

At present, there is no in-situ passive sampling system specially used for POPs in soil leachate at home and abroad.

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