Gradually-rising spiral passive sampler for organic pollutants on water-sediment interface

Abstract

The invention discloses a gradually-rising spiral passive sampler for organic pollutants on a water-sediment interface. The gradually-rising spiral passive sampler comprises a sediment pore water sampler and a water sampler arranged above the sediment pore water sampler, wherein a plurality of sediment sampling units are vertically arranged inside the sediment pore water sampler; a plurality of transversely-arranged water sampling units are sequentially arranged inside the water sampler in a vertical direction; the sediment pore water sampler and the water sampler are organically combined together, the sediment sampling units are arranged vertically and the transversely-arranged water sampling units are sequentially arranged in the vertical direction, so that the concentration of the organic pollutants in sediment pore water in different depths and the concentration of the organic pollutants in overlying water at different heights at the same position can be accurately obtained at the same time, namely the concentrations at different positions in the sediment pore water and the overlying water can be measured from multiple points at the same time; and through mathematical calculation, the real diffusion flux between the sediment pore water and the overlying water can be obtained. The gradually-rising spiral passive sampler is applied to the technical field of sampling of pollutants in water.

Description

technical field [0001] The invention relates to the technical field of water body sampling, in particular to a spiral-type passive sampler for organic pollutants at the water body-sediments interface. Background technique [0002] Persistent organic pollutants refer to highly toxic hydrophobic organic substances that remain in the environment for a long time, migrate and accumulate in organisms. In the natural environment, persistent organic pollutants are mainly stored in the organic phase of sediments, so they are stored in sediment pore water. The concentration of pollutants is higher than its concentration in the water body, and it continues to diffuse to the overlying water body, and circulates in the ecosystem through processes such as evaporation, dissolution, adsorption, and biological absorption. Because hydrophobic organic matter is potentially harmful to organisms, it is correct It is necessary to evaluate the exchange flux of hydrophobic pollutants between sedime...

AI Technical Summary

Problems solved by technology

[0004] In the existing technology, although the traditional method is simple and direct, it has the following disadvantages. First, it can only measure the data of a single point in the pore water and the overlying water body, and it is difficult to accurately reflect the characteristics of the concentration change. Secondly, the estimation of the interface flux is based on The assumption that the concentration gradient is linear is inconsistent with the theoretical calculation and the actual situation; thirdly, the determination of the concentration of organic matter in sediment pore water and overlying water requires a large amount of solvent, low recovery rate and high analysis cost

[0005] The in-situ flux measurement method has the advantages of being able to directly measure the diffusion flux and being less disturbed by environmental factors, but it also has the following disadvantages. First, the method measures the static one-way diffusion flux, that is, it is driven by the adsorption of the adsorbent. Below, the escape flux of part of the target substance migrating from the sediment or the overlying water body excludes the downward deposition flux of the target substance in the water body, so the measured flux is not the equilibrium flux; secondly, the measured flux is the flux at the sorbent site, not the complete diffusive flux from the sediment to the water body; again only a single value can be measured for a water body depth

Images