Lost but can’t be neglected: Huge quantities of small microplastics hide in the South China Sea,

Science of The Total Environment, Volume 633, 15
August 2018, Pages 1206-1216, ISSN 0048-9697,

Abstract:

Large quantities of microplastics with small particle sizes were found
in the South China Sea (SCS). The abundances of microplastics in
seawater were 0.045 ± 0.093and 2569 ± 1770 particles/m3 according to the
bongo net and pumping sampling methods, respectively. Smaller-size
fractions (size < 0.3 mm) contributed 92% of the number of microplastics
to the total load. Continental slope is the largest reservoir of
microplastics with an inventory of 295 tons. 21 polymer types were found
in the samples using the micro Fourier Transform Infrared Spectroscopy
(FTIR), among which alkyds (22.5%) and polycaprolactone (PCL) (20.9%)
accounted for almost half of the total polymer content. Lighter plastics
would not only concentrate upon the coastal area, being more likely to
drift further into open seas with ocean currents. The distribution
characteristics showed that it was mainly controlled by terrestrial
input of the Pearl River. This study, as the first report from SCS on
microplastics in water for its distribution and influence factors,
provided impetus for further research on the transportation fate and the
behavior of this emerging pollutant from coastal zone to the open
oceans.

https://drive.google.com/open?id=1Optkv-LRAILdqPJ48-dE9f_mHc4TXMhL
https://doi.org/10.1016/j.scitotenv.2018.03.197.(https://www.sciencedirect.com/science/article/pii/S0048969718309562)

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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..

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..