Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 396, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.122739
Keywords
Microplastics; Mercury; Hg adsorption kinetics; Mussel; Bioavailability
Categories
Funding
- Spanish Ministry of Economy and Competitiveness through the 2015-International Joint Planning Accions [PCIN-2015-187-C03-01]
- CONACYT (Mexico) [336649]
- Youth Employment and Implementation of the Youth Guarantee Program from the Spanish Ministry of Economy and Competitiveness [PEJ-2014-A-05040]
- Spanish State Research Agency (AEI) [CTM2017-90890-REDT]
- Ministry of Science, Innovation and Universities (MICIU) [CTM2017-90890-REDT]
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The adsorption and desorption of Hg onto and from microplastics (MP) and microalgae (MA) were investigated, and fitted using pseudo-first-order and pseudo-second order kinetics models. Then, the potential role of MP as vector for the entrance and accumulation of Hg (MP-Hg) in comparison to natural pathways (via MA -MA-Hg-, and dissolved -WB-Hg-) was investigated in mussel. Mussels were exposed to a single dose of Hg (2375 ng ind(-1)) for 4 h. Although the clearance of MP-Hg was relevant (82 %), it was lower than that of MA (95 %) and MA-Hg (94 %). The amount of the Hg accumulated and eliminated was higher in mussels exposed to MP-Hg (1417 ng Hg) than in those exposed to MA-Hg (882 ng Hg) and WB-Hg (1074 ng Hg). However, Hg accumulation was similar in the three mussel groups (approximate to 800 ng Hg). This was related to the fast elimination of Hg still attached to MP by MP-Hg mussels. Hg was mainly accumulated in digestive gland in MA-Hg and MP-Hg mussels, and in gills in WB-Hg mussels. Overall, the results indicated that MP facilitated the entrance of Hg in mussel but also promoted Hg elimination, which could limit the toxicological risk of Hg adsorbed onto MP.
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