In-situ testing device and method for emissions of endogenous pollutants in ocean sediments under simulated wave action

Abstract

The invention relates to the technical field of ocean sampling and in particular discloses an in-situ testing device and method for emissions of endogenous pollutants in ocean sediments under a simulated wave action. The in-situ testing device comprises an experimental platform, and is characterized in that a battery compartment, a collection bin and a test chamber are arranged on the experimentalplatform; a hydraulic device is arranged on the top of the experimental platform; a cylinder is arranged on the top of the test chamber and connected with a pressure plate by virtue of a connecting rod; water intake holes of different heights are formed in inner walls of the test chamber; water inlets are formed in middle position of outer walls; a plurality of vacuum sampling bottles connected with sampling tubes are arranged in the collection bin; and the test chamber and the collection bin are connected with the battery compartment. The in-situ testing device disclosed by the invention isreasonable in design and flexible in application, can be applied to in-situ experiments of bottom sediments, the problem that the original structure of the sediments is difficult to maintain in the indoor test sediment sampling process is solved, load conditions under different natural conditions are simulated, and the endogenous release rules of the bottom sediments are disclosed.

Description

(1) Technical field [0001] The invention relates to the field of marine sampling technology and marine pollution sediment dynamics, in particular to an in-situ testing device and method for simulating the release of endogenous pollutants in marine sediments under the action of waves. (2) Background technology [0002] Marine sediments are a collection of various pollutants, and the research on the accumulation, migration and transformation of pollutants in sediments is an important part of marine environmental protection. The pollutants in marine sediments mainly come from urban sewage, industrial wastewater, ship discharge and accidental leakage. Nearshore activities have led to an increase in the concentration of pollutants in marine sediments. Sediments in bays, ports and coastal waters contain high concentrations of pollutants, such as heavy metals, tributyl phosphate, petroleum hydrocarbons, polychlorinated biphenyls, and pesticides. Insecticides, etc. These pollutant...

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Problems solved by technology

[0003] The existing marine sediment-water interface pollutant flux automatic sampling and monitoring device (200820075277.6) is mainly used to study the static diffusion of pollutants in sediments, to collect seawater samples under static conditions, and to analyze and measure the seabed sediment-water interface The flux of pollutants in the region, while the release of endogenous pollutants in marine sediments mainly comes from the release of pollutants in sediments caused by sediment resuspension under hydrodynamic conditions, so the automatic sampling and detection device for pollutant fluxes is completely closed , cannot be used to study the release of endogenous pollutants under wave conditions; an existing multifunctional submarine flux and sediment in-situ sampling device (CN201410181903.4) is mainly used to verify seabed release flux and in-situ sampling , due to the limitation of the penetration depth of the device flux incubator, it can only be used for the study of the release flux of the seabed surface sediment, and it cannot simulate the wave load. For the sediment disturbance test, the automatic sampling device does not consider the influence of the concentration difference, and the detection of water samples There is a large error with the actual on-site water samples; under natural conditions, the on-site observation of seabed sediments (201711271009.6) collects water samples through direct sampling. Due to the complex hydrodynamic conditions of the observation and the inability to be uniformly controlled, it is impossible to realize the phenomenon caused by the single variable of waves. Research on the release amount and release law of pollutants in water; for the research on the release of endogenous pollutants in sediments under the action of waves, at present, it is mainly through indoor tanks (201120134463.9), but it is difficult for indoor experimental sediment samples to restore the state in the ocean, and sediments During the process of sampling through the sampler and during transportation, the sediment will be disturbed. When the collected sediment is laid on the bottom of the tank, the bedding structure and physical and chemical properties of the sediment will be changed, and it is difficult to maintain the original structure of the sediment.

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