期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 55, 期 14, 页码 9591-9600出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.1c01354
关键词
passive sampling in situ sampling; pore water; desorption; sediment profile; fine scale; atrazine
资金
- Chinese Scholarship Council (CSC)
- China Postdoctoral Science Foundation [2020M671434, 2020T130282]
- Jiangsu Province Postdoctoral Research Foundation [2020Z093]
- Jiangsu Natural Science Foundation [BK20180109]
- Double-First Universities Construction Fund of China (Nanjing University)
The DGT technique has been successfully used to investigate labile fractions of inorganic contaminants, but not organic contaminants. A new method for detecting Atrazine has been developed and tested in controlled soils and lake sediments. The study shows that ATR resupply in soil is controlled by the solid phase, and a DGT probe was successfully used to examine ATR distribution in sediment cores.
The diffusive gradients in thin films (DGT) technique has been successfully and widely applied to investigate the labile fractions of inorganic contaminants in soils and sediments, but there have been almost no applications to organic cm contaminants. Here we developed and tested the approach for the pesticide Atrazine (ATR) in a controlled soil experiment and in situ in an intact lake sediment core. The soil study explored the relationships between soil solution, DGT measured labile ATR and solvent extractable ATR in dosed soils of different organic matter, pH status and incubation times. The results are further interpreted using the DIFS (DGT-induced fluxes in soils and sediments model. Resupply of ATR to the soil solution was partially sustained by the solid phase in all the soils. This was due to small labile pool size and slow kinetics, with soil pH being an important controlling factor. The in situ sediment study successfully used a DGT probe to examine labile ATR distribution through the core on the subcm scale. It demonstrated-for the first time-an easy to use in situ technique to investigate the effects of redox on resupply kinetics and biogeochemical processes of trace organic contaminants in sediments.
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