ScienceAsia 46 (2020): 724-733 |doi:
Suspended microplastics during a tidal cycle in
sea-surface waters around Chao Phraya River mouth,
Roochira Sukhsangchan, Rangsiwut Keawsang, Suchai Worachananant,
Thon Thamrongnawasawat, Jitraporn Phaksopa*
ABSTRACT: The study investigated the influence of tides (low and high) on composition and abundance of microplastic.
Suspended microplastics (MP) were sampled in surface waters around the Chaophraya River mouth in Upper Gulf of
Thailand using Neuston trawl (330-?m mesh) during tidal cycle at both tides in rainy season (August) of 2019. The
abundance and types of microplastic had been analyzed. Overall, the concentration of MP during spring tide was
significantly lower than the concentration during neap tide (p < 0.01). Suspended microplastic particle concentration
ranged from 16.74 to 59.06 pieces per 100 m3 (spring tide) and 43.26 to 126.13 pieces per 100 m3 (neap tide).
Concentration of MP found during flood tide was higher which suggested marine derived MP. Dominant samples
identified under stereomicroscope were fibers and film. Using Fourier transform infrared spectrophotometry, the
majority of the particles was identified as polypropylene. The effect of the tidal amplitude was an important factor
determining the extent of the variations in microplastic abundance, which was stronger between the lower low tide
and the higher high tide.
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||Department of Marine Science, Faculty of Fisheries, Kasetsart University, Bangkok 10900 Thailand
* Corresponding author, E-mail: firstname.lastname@example.org
Received 28 May 2020, Accepted 10 Oct 2020