Assessment of Quantity and Quality of Microplastics in the Sediments, Waters, Oysters, and Selected Fish Species in Key Sites Along the Bombong Estuary and the Coastal Waters of Ticalan in San Juan, Batangas

Emilyn Q. Espiritu1*, Sophia Angeli SN. Dayrit1, Annabel Soledad O. Coronel1,
Natasha Sophia C. Paz1, Pilar Isabel L. Ronquillo1,
Virgil Christian G. Castillo2, and Erwin P. Enriquez2

1Environmental Science Department
2Chemistry Department
Ateneo de Manila University, Quezon City, Philippines

*Corresponding Author: This email address is being protected from spambots. You need JavaScript enabled to view it.





Microplastics (or MPs; < 5 mm in size) pollution is largely unstudied in the Philippines. From an environmental sustainability standpoint, it is important to understand the characteristics, abundance, and environmental fate of plastic debris of various sizes, and these include microplastics that are not more easily and readily detected. In this study, we assessed the extent of microplastics contamination in the sediments, waters, oysters, and selected fishes found in the rivers and coastal areas of Ticalan, Batangas, which were identified from water quality parameters as Class C and CS, respectively. The microplastics were extracted from these samples by chemical digestion of the matrix, series of filtration, and separation by flotation through a density gradient to finally isolate the microplastics which were not dissolved by chemical digestion. The isolated samples were imaged by optical microscopy and characterized based on their descriptive attributes. The results showed the presence of microplastics in all the samples tested, which were found mostly in the form of filaments, fragments, films, and pellets – with most showing weathered, degraded, or angular and irregular surfaces. Identification was done through spectral matching of the Fourier transform infrared spectra of isolated fragments with that of known plastics, although identification in some cases is made uncertain by possibility of degradation of the plastics in the environment. The majority of the isolates showed signature absorption bands of the C-H stretching vibrations of polyethylene-based plastics.



Plastics can be intentionally produced in specifically small sizes (e.g., microbeads in beauty products) or may undergo weathering resulting in the formation of microplastics. MPs, which have size dimensions less than 5 mm, are ubiquitous and continually accumulate in the marine environment, with approximately 8.2 bn kg reported to be entering the ocean every year globally due to improper disposal, runoff, etc. (Wilcox et al. 2015). Due to their high stability and durability, MPs can be persistent pollutants of the marine environment (Cozar et al. 2014), that could reach far distances, thus widening their impact on ecosystems (Ryan et al. 2009). Increasing global plastic production since the 1950s has increased the concern for pollution from such materials (Comăniță et al. 2017). Commercial products and their packaging as single-use plastic items, coupled with the challenge of effective waste management in the Philippines, have exacerbated plastic waste pollution (Ang and Sy-Changco 2007, Magalang 2014, Greenpeace 2017). . . . read more




ALONGI DM. 1994. The role of bacteria in nutrient recycling in tropical mangrove and other coastal benthic ecosystems. Hydrobiologia 285(1–3): 19–32
ANG RP, SY-CHANGCO JA. 2007. The phenomenon of sachet marketing: Lessons to be learned from the Philippines. American Marketing Association Conference Proceedings 18: 5–14.
ARGAMINO CR, JANAIRO JI. 2016. Qualitative assessment and management of microplastics in asian green mussels (Perna viridis) cultured in Bacoor bay, Cavite, Philippines. EnvironmentAsia 9(2): 48–54
BESSELING E, WEGNER A, FOEKEMA E, HEUVEL-GREVE MJ, KOELMANS AA. 2013. Effects of microplastic on fitness and PCB bioaccumulation by the lugworm Arenicola marina (L.). Environmental Science & Technology 47(1): 593–600.
COMĂNIȚĂ ED, HLIHOR RM, GHINEA C, GAVRILESCU M. 2016. Occurrence of plastic waste in the environment: ecological and health risks. Environmental Engineering & Management Journal 15(3).
COZAR A, ECHEVARRIA F, GONZALEZ-GORDILLO JI, IRIGOIEN X, UBEDA B, HERNANDEZ-LEON S, DUARTE CM. 2014. Plastic debris in the open ocean. Proceedings of The National Academy of Sciences 111(28): 10239–10244.
[DENR] Department of Environment and Natural Resources. 2016. Department Administrative Order 2016-08-WQG (Water Quality Guidelines) and General Effluent Standards (GES). Quezon City, Philippines.
ERIKSEN M, MASON S, WILSON S, BOX C, ZELLERS A, EDWARDS W, AMATO S. 2013. Microplastic pollution in the surface waters of the Laurentian Great Lakes. Marine Pollution Bulletin 77(1–2): 177–182.
EYHERAGUIBEL B, LEREMBOURE M, TRAIKIA M, SANCELME M, LACOSTEJ, DELORT AM, BONHOMME S, FROMAGEOT D, LEMAIRE J. 2018. Environmental scenarii for the degradation of oxo-polymers. Chemosphere 198: 182–190.
FRIES E, DEKIFF JH, WILLMEYER J, NUELLE MT, EBERT M, REMY D. 2013. Identification of polymer types and additives in marine microplastic particles using pyrolysis-GC/MS and scanning electron microscopy. Environ Sci: Processes Impacts 15: 1949.
GREENPEACE. 2017. Nestlé, Unilever, P&G among worst offenders for plastic pollution in Philippines in beach audit. Retrieved from
HAMMER C, PUTNAM A, CLUNE A, BUKSA B, VANBROCKLIN H, GARNEAU D. 2017. Microplastic biomagnification in invertebrate fish and cormorants in Lake Champlain [Poster Presentation]. Center for Earth and Environmental Sciences. SUNY Plattsburgh, Plattsburgh, NY.
HIDALGO-RUZ V, GUTOW L, THOMPSON RC, THIEL M. 2012. Microplastics in the marine environment: A review of the methods used for identification and quantification. Environ Sci Technol 46: 3060−3075.
HOLOMBOE N, KRISTENSEN E, ANDERSON F. 2001. Anoxic decomposition in sediments from a tropical mangrove forest and the temperate Wadden Sea: Implications of N and P addition experiments. Estuarine, Coastal and Shed Science 53: 125–140.
JUNG MR, HORGEN FD, ORSKI SV, RODRIGUEZ CV, BEERS KL, BALAZS GH, JONES TT, WORK TM, BRIGNAC KC, ROYER SJ, HYRENBACH KD, JENSEN BA, LYNCH JM. 2018. Validation of ATR FT-IR to identify polymers of plastic marine debris, including those ingested by marine organisms. Marine Pollution Bulletin 12: 704–716.
KARLSSON TM, VETHAAK AD, ALMROTH BC, ARIESE F, VELZEN MV, HASSELLÖV M, LESLIE HA. 2017. Screening for microplastics in sediment, water, marine invertebrates and fish: Method development and microplastic accumulation. Marine Pollution Bulletin 122(1–2): 403–408.
KHABBAZ F, ALBERTSSON A, KARLSSON S. 1999.  Chemical and morphological changes of environmentally degradable polyethylene films exposed to thermo-oxidation. Polym Degrad Stab 63: 127–138.
LESLIE H, BRANDSMA S, VELZEN MV, VETHAAK A. 2017. Microplastics en route: Field measurements in the Dutch river delta and Amsterdam canals, wastewater treatment plants, North Sea sediments and biota. Environment International 101: 133–142.
LENZ R, ENDERS K, STEDMON CA, MACKENZIE DMA, NIELSEN TG. 2015. A critical assessment of visual identification of marine microplastic using Raman spectroscopy for analysis improvement. Marine Pollution Bulletin 100(1): 82–91.
LOHMANN R, GIOIA R, JONES KC, NIZZETTO L, TEMME C, XIE ZY, SCHULZ-BULL D, HAND D, MORGAN E, JANTUNEN L. 2009. Organochlorine pesticides and PAHs in the surface water and atmosphere of the North Atlantic and Arctic Ocean. Environmental Science & Technology 43(15): 5633–5639.
LUSHER AL, WELDEN NA, SOBRAL P, COLE M. 2017. Sampling, isolating and identifying microplastics ingested by fish and invertebrates. Analytical Methods 9(9): 1346–1360.
MAGALANG AA. 2014. Municipal solid waste management in the Philippines. In: Municipal Solid Waste Management in Asia and the Pacific Islands. Pariatamby A, Tanaka M eds. Singapore: Springer.
MARTIN J, LUSHER A, THOMPSON RC, MORLEY A. 2017. The deposition and accumulation of microplastics in marine sediments and bottom water from the Irish Continental Shelf. Scientific Reports 7(1).
MASURA J, BAKER J, FOSTER G, ARTHUR C. 2015. Laboratory methods for the analysis of microplastics in the marine environment: Recommendations for quantifying synthetic particles in waters and sediments [NOAA Technical Memorandum NOS-OR&R-48]. Retrieved from
MATTONE C. 2016.  Benthic infauna of mangrove forests: Dissolved oxygen and environmental settings determine their community composition and function [Ph.D. thesis]. James Cook University.
MUNICIPALITY OF SAN JUAN, BATANGAS. 2015. Solid Waste Management Plan 2015–2025. 104p.
NAPPER I, THOMPSON R. 2019. Environmental deterioration of biodegradable, oxo-biodegradable, compostable, and conventional plastic carrier bags in the sea, soil, and open-air over a 3-year period. Environmental Science & Technology 53(9): 4775–4783.
PALER MKO, MALENAB MCT, MARALIT JR, NACORDA HM. 2019. Plastic waste occurrence on a beach off southwestern Luzon, Philippines. Mar Pollut Bull 141: 416–419.
[PHILGIS] Philippine GIS Data Clearinghouse. 2019. World Imagery. Retrieved from
QUINN B, MURPHY F, EWINS C. 2017. Validation of density separation for the rapid recovery of microplastics from sediment. Analytical Methods 9(9): 1491–1498.
RYAN PG, MOORE CJ, VAN FRANEKER JA, MOLONEY CL. 2009. Monitoring the abundance of plastic debris in the marine environment. Philosophical Transactions of the Royal Society B: Biological Sciences 364(1526): 1999–2012.
SHIM WJ, HONG SH, EO S. 2017. Identification methods in microplastic analysis: A review. Anal Methods 9: 1384–1391
SIMON M, VAN ALST N, VOLLERTSEN J. 2018. Quantification of microplastic mass and removal rates at wastewater treatment plants applying Focal Plane Array (FPA)-based Fourier Transform Infrared (FT-IR) imaging. Water Research 142: 1–9.
SONG YK, HONG SH, JANG M, HAN GM, RANI M, LEE J, SHIM WJ. 2015. A comparison of microscopic and spectroscopic identification methods for analysis of microplastics in environmental samples. Marine Pollution Bulletin 93(1–2): 202–209.
SUSSARELLU R, SUQUET M, THOMAS Y, LAMBERT C, FABIOUX C, PERNET M, LE GOÏC N, QUILLIEN V, MINGANT C, EPELBOIN Y, CORPOREAU C, GUYOMARCH J, ROBBENS J, PAUL-PONT I, SOUDANT P, HUVET A. 2016. Oyster reproduction is affected by exposure to polystyrene microplastics. Proceedings of the National Academy of Sciences 113(9): 2430–2435.
WILCOX C, SEBILLE EV, HARDESTY BD. 2015. Threat of plastic pollution to seabirds is global, pervasive, and increasing. Proceedings of the National Academy of Sciences 112(38): 11899–11904.
WOODALL LC, SANCHEZ-VIDAL A, CANALS M, PATERSON GL, COPPOCK R, SLEIGHT V, THOMPSON RC. 2014. The deep sea is a major sink for microplastic debris. Royal Society Open Science 1(4): 140317–140317.
YURTSEVER M, YURTSEVER U. 2018. Commonly used disposable plastic bags as a source of microplastic in environment. In: Proceedings of the International Conference on Microplastic Pollution in the Mediterranean Sea. Cocca M, Di Pace E, Errico M, Gentile G, Montarsolo A, Mossotti R eds. Cham, Switzerland: Springer Water.