Effect of seawater salinity on pore-size distribution on a poly(styrene)-based HP20 resin and its adsorption of diarrhetic shellfish toxins

Type Article
Date 2014-12-19
Language English
Author(s) Fan Lin1, Sun Geng1, Qiu Jiangbing1, Ma Qimin1, 2, Hess PhilippORCID3, Li Aifeng1, 2
Affiliation(s) 1 : College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
2 : Key Laboratory of Marine Environment and Ecology, Ocean University of China, Ministry of Education, Qingdao 266100, China
3 : Ifremer, Laboratoire Phycotoxines, 44311 Nantes, France
Source Journal Of Chromatography A (0021-9673), 2014-12-19 , Vol. 1373 , P. 1-8
DOI 10.1016/j.chroma.2014.11.008
WOS© Times Cited 16
Keyword(s) Diarrhetic shellfish toxins (DST), Solid phase adsorption toxin tracking (SPATT), HP20 resin, Salinity, Pore-size distribution, Pseudo-secondary kinetics equation
Abstract In the present study, okadaic acid (OA) and dinophysistoxin-1 (DTX1) were spiked into artificial seawater at low, medium and high estuarine salinities (9‰, 13.5‰ and 27‰). Passive samplers (HP20 resin) used for solid phase adsorption toxin tracking (SPATT) technology were exposed in these seawaters for12-h periods. Adsorption curves well fitted a pseudo-secondary kinetics model. The highest initial sorption rates of both toxins occurred in the seawater of medium salinity, followed by seawater of low and high estuarine salinity. Pore volumes of micropores (< 2 nm) and small mesopores (2 nm < diameter < 10 nm) of HP20 resin decreased after adsorption of toxins in seawater at high and low salinity but not in seawater at medium salinity, which demonstrated that the toxin molecules entered into micropores and mesopores (below 10 m in size) in seawaters of high and low salinity. More toxin or other matrix agglomerates were displayed on the surface of resin deployed in the seawater of medium salinity. Taking into consideration the pore-size distribution and surface images, it appears that intra-particle diffusion governs toxin adsorption in seawater at high salinity while film diffusion mainly controls the adsorption process in seawater at medium salinity. This is the first study to confirm that molecules of OA and DTX1 are able to enter into micropores (< 2 nm) and small mesopores (2 - 10 nm) of HP20 resin in estuarine seawater with high salinity (∼27 %).
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