Sorption of organic compounds by aged polystyrene microplastic particles,

Environmental Pollution, Volume 236, May 2018, Pages 218-225, ISSN 0269-7491,

Abstract:
Microplastics that are released into the environment undergo aging and
interact with other substances such as organic contaminants.
Understanding the sorption interactions between aged microplastics and
organic contaminants is therefore essential for evaluating the impact of
microplastics on the environment.
There is little information available on how the aging of microplastics affects
their sorption behavior andother properties.
We have therefore investigated the effects of an
accelerated UV-aging procedure on polystyrene microplastics, which are
used in products such as skin cleaners and foams. Physical and chemical
particle characterizations showed that aging led to significant surface
oxidation and minor localized microcrack formation.
Sorption coefficients of organic compounds by polystyrene microplastics following
aging were up to one order of magnitude lower than for pristine
particles. Sorption isotherms were experimentally determined using a
diverse set of probe sorbates covering a variety of substance classes
allowing an in-depth evaluation of the poly-parameter linear free-energy
relationship (ppLFER) modelling used to investigate the contribution of
individual molecular interactions to overall sorption. The ppLFER
modelling was validated using internal cross-validation, which confirmed
its robustness.
This approach therefore yields improved estimates of the interactions between
aged polystyrene microplastics and organic contaminants.

https://drive.google.com/open?id=1lxQ23XpLlVjn4Tcs1Odvch1jFM2xetr5
https://doi.org/10.1016/j.envpol.2018.01.022.

(https://www.sciencedirect.com/science/article/pii/S0269749117349977)

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Adsorption of antibiotics on microplastics,

Environmental Pollution, Volume 237, June 2018, Pages 460-467, ISSN 0269-7491,

Abstract:
Microplastics and antibiotics are two classes of emerging contaminants with proposed negative impacts to aqueous ecosystems. Adsorption of antibiotics on microplastics may result in their long-range transport and may cause compound combination effects.

In this study, we investigated the adsorption of 5 antibiotics [sulfadiazine (SDZ), amoxicillin (AMX), tetracycline (TC), ciprofloxacin (CIP), and trimethoprim (TMP)] on 5 types of microplastics [polyethylene (PE), polystyrene (PS), polypropylene (PP), polyamide (PA), and polyvinyl chloride (PVC)] in the freshwater and seawater systems.

Scanning Electron Microscope (SEM) and X-ray diffractometer (XRD) analysis revealed that microplastics have different surface characterizes and various degrees of crystalline. Adsorption isotherms demonstrated that
PA had the strongest adsorption capacity for antibiotics with distribution coefficient (Kd) values ranged from 7.36 ± 0.257 to 756 ± 48.0 L kg−1 in the freshwater system, which can be attributed to its porous structure and hydrogen bonding. Relatively low adsorption capacity was observed on other four microplastics. The adsorption
amounts of 5 antibiotics on PS, PE, PP, and PVC decreased in the order of CIP > AMX > TMP > SDZ > TC with Kf correlated positively with octanol-water partition coefficients (Log Kow). Comparing to freshwater system, adsorption capacity in seawater decreased significantly and no adsorption was observed for CIP and AMX. Our results indicated that commonly observed polyamide particles can serve as a carrier of antibiotics in the aquatic environment.

https://drive.google.com/open?id=1Y-s4k6L-6SEfwGaKSx3GSNSA_xns9NRU
https://doi.org/10.1016/j.envpol.2018.02.050.

(https://www.sciencedirect.com/science/article/pii/S0269749117345347)

The post Adsorption of antibiotics on microplastics appeared first on One Earth - One Ocean e. V..

Sorption of organic compounds by aged polystyrene microplastic particles,

Environmental Pollution, Volume 236, May 2018, Pages 218-225, ISSN 0269-7491,

Abstract:

Microplastics that are released into the environment undergo aging and interact with other substances such as organic contaminants.
Understanding the sorption interactions between aged microplastics and organic contaminants is therefore essential for evaluating the impact of microplastics on the environment. There is little information available on how the aging of microplastics affects their sorption behavior and other properties. We have therefore investigated the effects of an
accelerated UV-aging procedure on polystyrene microplastics, which are used in products such as skin cleaners and foams.
Physical and chemical particle characterizations showed that aging led to significant surface oxidation and minor localized microcrack formation. Sorption coefficients of organic compounds by polystyrene microplastics following
aging were up to one order of magnitude lower than for pristine particles. Sorption isotherms were experimentally determined using a diverse set of probe sorbates covering a variety of substance classes allowing an in-depth evaluation of the poly-parameter linear free-energy relationship (ppLFER) modelling used to investigate the contribution of individual molecular interactions to overall sorption. The ppLFER modelling was validated using internal cross-validation, which confirmed its robustness. This approach therefore yields improved estimates of the
interactions between aged polystyrene microplastics and organic contaminants.
Keywords: Adsorption; Photooxidation; Polymer particles; Fate; Transport

https://drive.google.com/open?id=1lxQ23XpLlVjn4Tcs1Odvch1jFM2xetr5

https://doi.org/10.1016/j.envpol.2018.01.022.(https://www.sciencedirect.com/science/article/pii/S0269749117349977)

The post Sorption of organic compounds by aged polystyrene microplastic particles appeared first on One Earth - One Ocean e. V..

Adsorption of antibiotics on microplastics,

Environmental Pollution, Volume 237, June 2018, Pages 460-467, ISSN 0269-7491,

Abstract:

Microplastics and antibiotics are two classes of emerging contaminants with proposed negative impacts to aqueous ecosystems. Adsorption of antibiotics on microplastics may result in their long-range transport and may cause compound combination effects.
In this study, we investigated  the adsorption of 5 antibiotics [sulfadiazine (SDZ), amoxicillin (AMX), tetracycline (TC), ciprofloxacin (CIP), and trimethoprim (TMP)] on 5 types of microplastics [polyethylene (PE), polystyrene (PS), polypropylene (PP), polyamide (PA), and polyvinyl chloride (PVC)] in the freshwater and seawater systems. Scanning Electron Microscope (SEM) and X-ray diffractometer (XRD) analysis revealed that microplastics have different surface characterizes and various degrees of crystalline. Adsorption isotherms demonstrated that PA had the strongest adsorption capacity for antibiotics with distribution coefficient (Kd) values ranged from 7.36 ± 0.257 to
756 ± 48.0 L kg−1 in the freshwater system, which can be attributed to its porous structure and hydrogen bonding.

Relatively low adsorption capacity was observed on other four microplastics. The adsorption amounts of 5 antibiotics on PS, PE, PP, and PVC decreased in the order of CIP > AMX > TMP > SDZ > TC with Kf correlated positively with
octanol-water partition coefficients (Log Kow). Comparing to freshwater system, adsorption capacity in seawater decreased significantly and no adsorption was observed for CIP and AMX. Our results indicated that commonly observed polyamide particles can serve as a carrier of antibiotics in the aquatic environment.

https://drive.google.com/open?id=1Y-s4k6L-6SEfwGaKSx3GSNSA_xns9NRU
https://doi.org/10.1016/j.envpol.2018.02.050.(https://www.sciencedirect.com/science/article/pii/S0269749117345347)

The post Adsorption of antibiotics on microplastics appeared first on One Earth - One Ocean e. V..

Environmental Pollution, Volume 235, 2018, Pages 680-691, ISSN 0269-7491,

Abstract:

Plastic debris has become an environmental problem during
recent years. Among the plastic debris, microplastics (<5 mm; MPLs)
imply an extra problem due to their capacity to enter into the fauna
through ingestion. In this work, we study the capacity of three MPLs,
that include high-density polyethylene (HDPE), polystyrene (PS) and
polystyrene carboxylate (PS-COOH), to sorb 18 perfluoroalkyl substances
(PFASs; including carboxylic acids, sulphonates and one sulphonamide)
from the surrounding waters (freshwater and seawater). Conclusions drawn
from the results are that perfluoro sulphonates and sulphonamides have
more tendency to be sorbed onto MPLs. In addition, PS and PS-COOH have
more affinity for PFASs than HDPE. Finally, the increment of
conductivity and pH of the water decreases the exposure time that is
necessary to reach equilibrium. However, the presence of salts decreases
the tendency of PFASs to be sorbed onto plastic surfaces. These results
highlight the problem associated with the presence of MPLs in inland and
marine waters since toxic compounds can be sorbed onto surrounding
plastics that could be ingested by aquatic fauna.

https://drive.google.com/open?id=1rtdzyjDJ0A375NPIpVx_KudbRZihrEQc

https://doi.org/10.1016/j.envpol.2017.12.075.(http://www.sciencedirect.com/science/article/pii/S0269749117323436)

The post Adsorption of perfluoroalkyl substances on microplastics under environmental conditions appeared first on One Earth - One Ocean e. V..

Marine Pollution Bulletin, Volume 126, 2018, Pages 606-609, ISSN 0025-326X,

Abstract:

Microplastics and synthetic musks (SMs) are two typical organic pollutants in the marine environment. In this study, the
sorption of three SMs to microplastics in a simulated seawater environment was examined.
Tonalide (AHTN), musk xylene (MX), and musk ketone (MK) were the musks investigated, while polypropylene (PP) was
used as the microplastic. It was found that the equilibrium sorption time was about 10h and the adsorption kinetics model conformed
to a Lagergren adsorption model.
The adsorption capacity increased with decreasing particle size. Adsorption reached a peak at 25°C, and the adsorption capacity was not sensitive to the concentration of sodium chloride. There is a need for more research and monitoring of microplastics in the marine environment due to their strong ability to absorb organic pollutants.

 https://www.sciencedirect.com/science/article/pii/S0025326X17307609/pdfft?md5=1acc6084801711d8f16eeaa52e913c7c&pid=1-s2.0-S0025326X17307609-main.pdf
https://doi.org/10.1016/j.marpolbul.2017.09.025.(http://www.sciencedirect.com/science/article/pii/S0025326X17307609)

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