Microplastics in water, from treatment process to drinking water: analytical methods and potential health effects

Abstract

Aim: The commonly used analytical methods for microplastic (MPs) detection in drinking water and the threat of MP pollution in water intended for human consumption to human beings are presented through a systematic review. Furthermore, MP occurrence, transport, and fate from raw to treated drinking water, tap water, and bottled water, as well as the possible health impacts of MPs on human beings, are also evaluated.

Methods: Systematic review included articles published in scientific journals that contain specific keywords in the title and were searched in Web of Science (WOS) and Scopus. The literature was selected and extracted by two reviewers based on the PRISMA-A guidelines, which recommend including 57 items.

Results: The experimental studies pointed out that sampling is performed using grab or reduced samples, and sample treatment involves mostly oxidation with hydrogen peroxide and density separation. The minimum sample size obtainable in the extraction and the maximum density of the polymer separable from the matrix provided different results. Clearly, the determination of MPs involves the simultaneous application of several analytical techniques, including optical, fluorescence, and electronic microscopies, µFTIR, µ-Raman, and pyrolysis gas chromatography-mass spectrometry. The determination technique also provides different results according to the sensitivity as well as the minimum size determinable. These studies are mostly devoted to establishing the occurrence, transport, and fate within the supply network, the efficiency in removal of MPs from drinking water by treatment plants, and the risk to humans. The MP concentration in drinking water reservoirs is highly variable. However, tap water always presents lower concentrations of MPs than the water that enters the drinking water treatment plants because the different treatments are efficient at removing MPs. Although it has not been fully demonstrated that MPs are toxic to humans, the effects point to oxidative stress, gastrointestinal irritation, microbiome irregularities, and changes in lipid metabolism.

Conclusion: Analytical methods present some common features as a first step towards harmonization. However, it is still unknown whether the analytical methods could influence the disparity of the results. The MP concentration in drinking water is low in comparison to other types of water. MPs are not exempt from hazards to human health.

Keywords

Plastics / raw water / tap water / bottled water / drinking water treatment plants / risk assessment

References

[1] Plastics-the Facts. An analysis of European plastics production, demand and waste data. 2020. Available from: https://plasticseurope.org/knowledge-hub/plastics-the-facts-2020/ [Last accessed on 12 Jul 2022]

[2] Shrivastava S.Strengthening of existing water treatment procedures to respond to the presence of microplastics in the drinking water.Int J Env Health Eng2020;9:1

[3] Barceló D.Microplastics in the global aquatic environment: analysis, effects, remediation and policy solutions.J Environ Chem Eng2019;7:103421

[4] Barcelo D.Case studies of macro- and microplastics pollution in coastal waters and rivers: Is there a solution with new removal technologies and policy actions?.Case Stud Chem Environ Eng2020;2:100019

[5] Smith E,Henrie T,Rosen J.Microplastics: what drinking water utilities need to know.J Am Water Works Assoc2019;111:26-37

[6] Gomiero A,Palmas L.Application of GCMS-pyrolysis to estimate the levels of microplastics in a drinking water supply system.J Hazard Mater2021;416:125708

[7] Picó Y,Alfarhan AH,Barceló D.First evidence of microplastics occurrence in mixed surface and treated wastewater from two major Saudi Arabian cities and assessment of their ecological risk.J Hazard Mater2021;416:125747

[8] Picó Y,Alfarhan AH,Alshahrani HO.Pharmaceuticals, pesticides, personal care products and microplastics contamination assessment of Al-Hassa irrigation network (Saudi Arabia) and its shallow lakes.Sci Total Environ2020;701:135021

[9] Picó Y.Analysis and prevention of microplastics pollution in water: current perspectives and future directions.ACS Omega2019;4:6709-19 PMCID:PMC6648735

[10] Koelmans AA,Hermsen E,Mintenig SM.Microplastics in freshwaters and drinking water: critical review and assessment of data quality.Water Res2019;155:410-22 PMCID:PMC6449537

[11] Li Y,Jarvis P.Occurrence, removal and potential threats associated with microplastics in drinking water sources.J Environ Chem Eng2020;8:104527

[12] Barchiesi M,Di Marcantonio C.Presence and fate of microplastics in the water sources: focus on the role of wastewater and drinking water treatment plants.J Water Process Eng2021;40:101787

[13] Eriksen M,Carson HS.Plastic pollution in the world’s oceans: more than 5 trillion plastic pieces weighing over 250,000 tons afloat at sea.PLoS One2014;9:e111913 PMCID:PMC4262196

[14] De-la-Torre GE,Pizarro-Ortega CI.Binational survey of personal protective equipment (PPE) pollution driven by the COVID-19 pandemic in coastal environments: abundance, distribution, and analytical characterization.J Hazard Mater2022;426:128070 PMCID:PMC8672681

[15] Hajiouni S,Ramavandi B.Occurrence of microplastics and phthalate esters in urban runoff: a focus on the Persian Gulf coastline.Sci Total Environ2022;806:150559

[16] Cheng YL,Kim H,Fai Tsang Y.Occurrence and removal of microplastics in wastewater treatment plants and drinking water purification facilities: a review.Chem Eng J2021;410:128381

[17] Novotna K,Pivokonska L,Pivokonsky M.Microplastics in drinking water treatment - current knowledge and research needs.Sci Total Environ2019;667:730-40

[18] Prata JC,Lopes I,Duarte AC.A One Health perspective of the impacts of microplastics on animal, human and environmental health.Sci Total Environ2021;777:146094

[19] Prata JC,Lopes I,Rocha-Santos T.Environmental exposure to microplastics: an overview on possible human health effects.Sci Total Environ2020;702:134455

[20] Walkinshaw C,Thompson R,Cole M.Microplastics and seafood: lower trophic organisms at highest risk of contamination.Ecotoxicol Environ Saf2020;190:110066

[21] Zhang Q,Li J.A review of microplastics in table salt, drinking water, and air: direct human exposure.Environ Sci Technol2020;54:3740-51

[22] Conti I,Varano G,Costanzi E.Legislation to limit the environmental plastic and microplastic pollution and their influence on human exposure.Environ Pollut2021;288:117708

[23] Oßmann BE.Microplastics in drinking water?.Curr Opin Food Sci2021;41:44-51

[24] Oladoja NA.The pathways of microplastics contamination in raw and drinking water.J Water Process Eng2021;41:102073

[25] Eerkes-medrano D,Quinn B.Microplastics in drinking water: a review and assessment.Curr Opin Environ Sci Health2019;7:69-75 PMCID:PMC6449537

[26] Ásmundsdóttir ÁM,Øysæd KB.Microplastics and nanoplastics occurrence and composition in drinking water from Akureyri Urban Area, Iceland. Springer Water 2020. p. 106-11.

[27] Sol D,Laca A.Microplastics in wastewater and drinking water treatment plants: occurrence and removal of microfibres.Appl Sci2021;11:10109

[28] Picó Y.Pyrolysis gas chromatography-mass spectrometry in environmental analysis: focus on organic matter and microplastics.TrAC Trends Anal Chem2020;130:115964

[29] Pico Y,Barcelo D.Nano- and microplastic analysis: focus on their occurrence in freshwater ecosystems and remediation technologies.TrAC Trends Anal Chem2019;113:409-25

[30] Elkhatib D.A critical review of extraction and identification methods of microplastics in wastewater and drinking water.Environ Sci Technol2020;54:7037-49

[31] Praveena SM.Quality assessment for methodological aspects of microplastics analysis in bottled water - a critical review.Food Control2021;130:108285

[32] Schymanski D,Benismail N.Analysis of microplastics in drinking water and other clean water samples with micro-Raman and micro-infrared spectroscopy: minimum requirements and best practice guidelines.Anal Bioanal Chem2021;413:5969-94 PMCID:PMC8440246

[33] Di M,Wang W.Corrigendum to “Pollution in drinking water source areas: Microplastics in the Danjiangkou Reservoir, China” [Environ. Toxicol. Pharmacol. 65 (January) 2019 82-89].Environ Toxicol Pharmacol2019;66:133

[34] Zuccarello P,Cristaldi A.Reply for comment on “Exposure to microplastics (< 10 μm) associated to plastic bottles mineral water consumption: the first quantitative study by Zuccarello et al. [Water Research 157 (2019) 365-371]”.Water Res2019;166:115077

[35] Oßmann B,Ivleva NP.Comment on “exposure to microplastics (< 10 μm) associated to plastic bottles mineral water consumption: the first quantitative study by Zuccarello et al. [Water Research 157 (2019) 365-371]”.Water Res2019;162:516-7

[36] Xue J,Chen J,Ng KTW.What have we known so far about microplastics in drinking water treatment?.Front Environ Sci Eng2022;16:58 PMCID:PMC8527969

[37] Shen M,Zhu Y.Removal of microplastics via drinking water treatment: current knowledge and future directions.Chemosphere2020;251:126612

[38] Ding H,He H.Do membrane filtration systems in drinking water treatment plants release nano/microplastics?.Sci Total Environ2021;755:142658

[39] Xu Y,Liu C.Are micro- or nanoplastics leached from drinking water distribution systems?.Environ Sci Technol2019;53:9339-40

[40] Hogue C. POLLUTION Microplastics in drinking water not risky. chemical & engineering news. Chem Eng News 2019;97:22. Available online: https://www.cheric.org/research/tech/periodicals/view.php?seq=1758887 [Last accessed on 12 Jul 2022]

[41] Mortensen NP,Johnson LM.Unintended human ingestion of nanoplastics and small microplastics through drinking water, beverages, and food sources.NanoImpact2021;21:100302

[42] Hohmann-Jeddi C. Microplastics in drinking water: WHO calls for more research on risks. Pharmazeutische Zeitung. 2019;164:46. Available online: https://www.pharmazeutische-zeitung.de/who-fordert-mehr-forschung-zu-risiken/ [Last accessed on 12 Jul 2022]

[43] Adib D,Tabeshkia H.Identification of microplastics in conventional drinking water treatment plants in Tehran, Iran.J Environ Health Sci Eng2021;19:1817-26 PMCID:PMC8617154

[44] Almaiman L,Bineid M.The occurrence and dietary intake related to the presence of microplastics in drinking water in Saudi Arabia.Environ Monit Assess2021;193:390

[45] Chanpiwat P.Abundance and characteristics of microplastics in freshwater and treated tap water in Bangkok, Thailand.Environ Monit Assess2021;193:258

[46] Cherniak SL,McKie MJ.Conventional and biological treatment for the removal of microplastics from drinking water.Chemosphere2022;288:132587

[47] Dalmau-Soler J,Boleda MR,Ferrer N.Microplastics from headwaters to tap water: occurrence and removal in a drinking water treatment plant in Barcelona Metropolitan area (Catalonia, NE Spain).Environ Sci Pollut Res Int2021;28:59462-72

[48] Dalmau-soler J,Ferrer N,Lacorte S.Microplastics throughout a tap water supply network.Water Environ J2022;36:292-8

[49] Di M,Wang W.Manuscript prepared for submission to environmental toxicology and pharmacology pollution in drinking water source areas: Microplastics in the Danjiangkou Reservoir, China.Environ Toxicol Pharmacol2019;65:82-9

[50] Huang S,Wang Z.Spatiotemporal distribution of microplastics in surface water, biofilms, and sediments in the world’s largest drinking water diversion project.Sci Total Environ2021;789:148001

[51] Ibeto C,Ofomatah A,Okafocha T.Microplastics pollution indices of bottled water from South Eastern Nigeria.Intern J Environ Anal Chem2021;

[52] Kirstein IV,Gomiero A.Drinking plastics?.Water Res2021;188:116519

[53] Lee EH,Chang Y.Simple screening of microplastics in bottled waters and environmental freshwaters using a novel fluorophore.Chemosphere2021;285:131406

[54] Li Y,Guan B.Separation and identification of nanoplastics in tap water.Environ Res2022;204:112134

[55] Mintenig SM,Primpke S.Low numbers of microplastics detected in drinking water from ground water sources.Sci Total Environ2019;648:631-5

[56] Mukotaka A,Nihei Y.Rapid analytical method for characterization and quantification of microplastics in tap water using a Fourier-transform infrared microscope.Sci Total Environ2021;790:148231

[57] Oßmann BE,Holtmannspötter H,Christiansen SH.Small-sized microplastics and pigmented particles in bottled mineral water.Water Res2018;141:307-16

[58] Paredes M,Viteri R,Bodero E.Microplastics in the drinking water of the Riobamba city, Ecuador.srees2021;28:653-63

[59] Pivokonský M,Novotná K,Klimtová M.Occurrence and fate of microplastics at two different drinking water treatment plants within a river catchment.Sci Total Environ2020;741:140236

[60] Pivokonsky M,Novotna K,Cajthaml T.Occurrence of microplastics in raw and treated drinking water.Sci Total Environ2018;643:1644-51

[61] Sarkar DJ,Das BK.Microplastics removal efficiency of drinking water treatment plant with pulse clarifier.J Hazard Mater2021;413:125347

[62] Scircle A.Detecting and quantifying microplastics in bottled water using fluorescence microscopy: a new experiment for instrumental analysis and environmental chemistry courses.J Chem Educ2020;97:234-8

[63] Shen M,Wen X.Presence of microplastics in drinking water from freshwater sources: the investigation in Changsha, China.Environ Sci Pollut Res Int2021;28:42313-24

[64] Shruti VC,Kutralam-Muniasamy G.Metro station free drinking water fountain- a potential “microplastics hotspot” for human consumption.Environ Pollut2020;261:114227

[65] Singh T.Generation of microplastics from the opening and closing of disposable plastic water bottles.J Water Health2021;19:488-98 PMCID:wh_2021_025

[66] Tong H,Hu X.Occurrence and identification of microplastics in tap water from China.Chemosphere2020;252:126493

[67] Wang Z,Chen W.Occurrence and removal of microplastics in an advanced drinking water treatment plant (ADWTP).Sci Total Environ2020;700:134520

[68] Weber F,Wolff S,Eschweiler V.Investigation of microplastics contamination in drinking water of a German city.Sci Total Environ2021;755:143421

[69] Weisser J,Hufnagl B.From the well to the bottle: identifying sources of microplastics in mineral water.Water2021;13:841

[70] Wu J,Tang Y.Fragmentation of microplastics in the drinking water treatment process - a case study in Yangtze River region, China.Sci Total Environ2022;806:150545

[71] Zhang M,Ding H.Distribution characteristics and influencing factors of microplastics in urban tap water and water sources in Qingdao, China.Analytical Letters2020;53:1312-27

[72] Zuccarello P,Cristaldi A.Exposure to microplastics (< 10 μm) associated to plastic bottles mineral water consumption: the first quantitative study.Water Res2019;157:365-71

[73] Shao Y,Liu X.Pre-oxidization-induced change of physicochemical characteristics and removal behaviours in conventional drinking water treatment processes for polyethylene microplastics.RSC Adv2020;10:41488-94 PMCID:PMC9057855

[74] Parolini M,De Felice B.Interactive effects between sinking polyethylene terephthalate (PET) microplastics deriving from water bottles and a benthic grazer.J Hazard Mater2020;398:122848