TY - JOUR
T1 - Role of extracellular polymeric substances in leaching and bioconcentration of benzophenone-3 from microplastic fragments
AU - Achar, Jerry Collince
AU - Na, Joorim
AU - Im, Hyungjoon
AU - Jung, Jinho
N1 - Funding Information:
This study was supported by a grant from the National Research Foundation of Korea (NRF), funded by the Korean Government ( NRF-2019R1A2C1002890 ).
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/8/15
Y1 - 2021/8/15
N2 - Adverse effects of microplastics (MPs) are exacerbated by plastic additives such as benzophenone-3 (BP-3). The aim of the present study was to evaluate the role of extracellular polymeric substances (EPS) of Chlorella vulgaris in leaching BP-3 additive (3.0 ± 0.2% wt/wt) from polyethylene MP fragments (99.8 ± 4.1 µm) and subsequent bioconcentration in Daphnia magna. BP-3 leaching in M4 medium was higher at pH 8 than at pH 6, because of the higher solubility of BP-3 (pKa = 7.07) at pH 8. However, EPS reduced BP-3 leaching in M4 medium, possibly because of repulsive interactions between the negatively charged EPS and anionic BP-3. Thus, BP-3 leaching was greater at lower pH (6 > 8) and EPS concentration (20 > 50 mg L−1 as total organic carbon), which was well related to BP-3 sorption capacity of EPS. Although BP-3 uptake in D. magna was decreased at pH 8 by increasing EPS concentration, the bioconcentration of BP-3 in D. magna was increased, possibly because of reduced BP-3 elimination. These findings suggest the important role of EPS in the bioconcentration of anionic plastic additives, which should be further evaluated to understand the underlying toxicokinetic mechanisms.
AB - Adverse effects of microplastics (MPs) are exacerbated by plastic additives such as benzophenone-3 (BP-3). The aim of the present study was to evaluate the role of extracellular polymeric substances (EPS) of Chlorella vulgaris in leaching BP-3 additive (3.0 ± 0.2% wt/wt) from polyethylene MP fragments (99.8 ± 4.1 µm) and subsequent bioconcentration in Daphnia magna. BP-3 leaching in M4 medium was higher at pH 8 than at pH 6, because of the higher solubility of BP-3 (pKa = 7.07) at pH 8. However, EPS reduced BP-3 leaching in M4 medium, possibly because of repulsive interactions between the negatively charged EPS and anionic BP-3. Thus, BP-3 leaching was greater at lower pH (6 > 8) and EPS concentration (20 > 50 mg L−1 as total organic carbon), which was well related to BP-3 sorption capacity of EPS. Although BP-3 uptake in D. magna was decreased at pH 8 by increasing EPS concentration, the bioconcentration of BP-3 in D. magna was increased, possibly because of reduced BP-3 elimination. These findings suggest the important role of EPS in the bioconcentration of anionic plastic additives, which should be further evaluated to understand the underlying toxicokinetic mechanisms.
KW - Algae
KW - Leachate
KW - Microplastic
KW - Plastic additive
KW - Water flea
UR - http://www.scopus.com/inward/record.url?scp=85104325377&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2021.125832
DO - 10.1016/j.jhazmat.2021.125832
M3 - Article
C2 - 33887569
AN - SCOPUS:85104325377
SN - 0304-3894
VL - 416
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 125832
ER -