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Edlund",authors:[{id:"65273",title:"Dr.",name:"Scott",middleName:null,surname:"Novak",fullName:"Scott Novak",slug:"scott-novak"},{id:"119803",title:"Ms.",name:"Sara",middleName:null,surname:"Calvin",fullName:"Sara Calvin",slug:"sara-calvin"},{id:"119804",title:"Dr.",name:"Cristie",middleName:null,surname:"Glasheen",fullName:"Cristie Glasheen",slug:"cristie-glasheen"},{id:"119805",title:"Dr.",name:"Mark",middleName:null,surname:"Edlund",fullName:"Mark Edlund",slug:"mark-edlund"}]},{id:"22670",title:"Substance Use and Abuse Among Older Adults: A State of the Art",slug:"substance-use-and-abuse-among-older-adults-a-state-of-the-art",signatures:"Marja Aartsen",authors:[{id:"67611",title:"Dr.",name:"Marja",middleName:null,surname:"Aartsen",fullName:"Marja Aartsen",slug:"marja-aartsen"}]},{id:"22671",title:"Tobacco Addiction",slug:"tobacco-addiction",signatures:"Stephan Muehlig",authors:[{id:"73214",title:"Prof.",name:"Stephan",middleName:null,surname:"Muhlig",fullName:"Stephan Muhlig",slug:"stephan-muhlig"}]},{id:"22672",title:"Comorbidity of a Serious Mental Illness with an Addiction to Psychoactive Substances",slug:"comorbidity-of-a-serious-mental-illness-with-an-addiction-to-psychoactive-substances",signatures:"Krzysztof Krysta, Irena Krupka-Matuszczyk, Małgorzata Janas-Kozik and Małgorzata Stachowicz",authors:[{id:"64475",title:"Prof.",name:"Irena",middleName:null,surname:"Krupka-Matuszczyk",fullName:"Irena Krupka-Matuszczyk",slug:"irena-krupka-matuszczyk"},{id:"63993",title:"Dr.",name:"Krzysztof",middleName:null,surname:"Krysta",fullName:"Krzysztof Krysta",slug:"krzysztof-krysta"},{id:"68008",title:"Dr.",name:"Malgorzata",middleName:null,surname:"Janas-Kozik",fullName:"Malgorzata Janas-Kozik",slug:"malgorzata-janas-kozik"},{id:"68010",title:"Dr.",name:"Malgorzata",middleName:null,surname:"Stachowicz",fullName:"Malgorzata Stachowicz",slug:"malgorzata-stachowicz"}]},{id:"22673",title:"Molecular Mechanism of the Involvement of the Susceptibility Genes, DISC1, PACAP, TRAP1 and Dysbindin in Major Psychiatric Disorders Such as Schizophrenia, Depression and Bipolar Disease",slug:"molecular-mechanism-of-the-involvement-of-the-susceptibility-genes-disc1-pacap-trap1-and-dysbindin-i",signatures:"Taiichi Katayama, Shinsuke Matsuzaki, Tsuyosi Hattori and Masaya Tohyama",authors:[{id:"68230",title:"Prof.",name:"Masaya",middleName:null,surname:"Tohyama",fullName:"Masaya Tohyama",slug:"masaya-tohyama"},{id:"130481",title:"Prof.",name:"Taiichi",middleName:null,surname:"Katayama",fullName:"Taiichi Katayama",slug:"taiichi-katayama"},{id:"137416",title:"Dr.",name:"Shinsuke",middleName:null,surname:"Matsuzaki",fullName:"Shinsuke Matsuzaki",slug:"shinsuke-matsuzaki"},{id:"137417",title:"Dr.",name:"Tsuyosi",middleName:null,surname:"Hattori",fullName:"Tsuyosi Hattori",slug:"tsuyosi-hattori"}]},{id:"22674",title:"Neurotransmitter and Behaviour: Serotonin and Anxiety",slug:"neurotransmitter-and-behaviour-serotonin-and-anxiety",signatures:"André Rex and Heidrun Fink",authors:[{id:"65589",title:"Dr.",name:"Andre",middleName:null,surname:"Rex",fullName:"Andre Rex",slug:"andre-rex"},{id:"71070",title:"Prof.",name:"Heidrun",middleName:null,surname:"Fink",fullName:"Heidrun Fink",slug:"heidrun-fink"}]},{id:"22675",title:"Psychogenic Movement Disorders",slug:"psychogenic-movement-disorders",signatures:"Carlo Dallocchio",authors:[{id:"66135",title:"Dr.",name:"Carlo",middleName:null,surname:"Dallocchio",fullName:"Carlo Dallocchio",slug:"carlo-dallocchio"}]}]}]},onlineFirst:{chapter:{type:"chapter",id:"71438",title:"Microplastic Pollution in Portuguese Saltworks",doi:"10.5772/intechopen.91476",slug:"microplastic-pollution-in-portuguese-saltworks",body:'\nPlastics have played a fundamental role in man’s daily life since the invention of Bakelite, the first synthetic polymer created by the chemist Leo Baekeland in 1907. Newly synthetic polymers were developed in the following years. These were capable of resisting higher temperatures without degrading, thus allowing the creation of a revolutionary era, within all commercial sectors (mainly industrial, health, and domestic), that shaped the habits of the future generations [1, 2]. The mass production of plastic began in the 1950s and has since evolved exponentially. For instance, in 2017, worldwide plastic production surpassed 348 million tons [3, 4]. Nevertheless, plastics have become persistent pollutants in the most diverse environments (atmospheric air, sources of freshwater, brackish, and saltwater, and soils) mainly due to their industrial characteristics (durability, hydrophobic composition, and plasticity) but also due to their improper handling over the years [1, 2, 5].
\nThere are several ways in which plastic debris can reach the oceans, such as: (1) terrestrial sources (e.g., rivers and estuaries), (2) several industrial sectors, (3) treated and untreated urban effluents, (4) and human activities (e.g., fishing) [6]. For example, our oceans receive, annually, a total of 4.8 to 12.7 million tons of plastic, from which 1.15 to 2.41 million tons come directly from freshwater streams [5, 7, 8]. Several studies have been carried out over the last two decades regarding the problem of plastics and their degradation into smaller particles. Since the 1970s, many scientists have suspected the harmful effects of these anthropogenic particles on the environment [9, 10, 11, 12]. However, it was not until the 1990s that microplastics were considered and recognized as emerging pollutants. Therefore, scientists have been developing identification methods to better understand this problem’s magnitude [13].
\nMicroplastics (MPs) are characterized as plastic materials or fragments of small proportions, with measurements inferior to 5 mm [14]. MPs existing in aquatic environments may originate from primary sources (where they are designed and produced for a specific purpose) or from secondary sources (resulting from the degradation of larger plastic debris) [15]. In the oceans, the most prevalent synthetic polymers are polypropylene (PP), polyethylene (PE), polystyrene (PS), polyvinyl chloride (PVC) and polyethylene terephthalate (PET) [16]. Today we are often surrounded by the presence of microplastics as they are everywhere; from our oceans, rivers, sediments, living organisms, atmospheric air and even food resources [14, 17]. These synthetic micropolymers have the ability to accumulate in our food chain, thus reaching various types of organisms. Several studies have been conducted in recent years to understand the potential impacts of these anthropogenic compounds on human health [6, 18].
\nIn Portugal, the population is culturally linked to the sea and its resources, thus becoming more exposed to pollution present in the Atlantic Ocean. In recent years, several studies have been published about the accumulation of microplastics on beaches [19, 20, 21], estuaries [22, 23] and aquatic organisms [22, 24, 25] in Portugal. Moreover, many of these MPs had high concentrations of polychlorinated biphenyls (PCBs), pesticides (e.g., DDTs), polycyclic aromatic hydrocarbons (PAHs), and other persistent contaminants adsorbed to their surface [20, 26, 27, 28]. Additionally, all these chemical compounds are capable of causing problems in various aquatic ecosystems (such as marine, estuarine, lotic and lentic ecological communities). Hence, Yang et al. [14] hypothesized that saltwater-based commercial table salts were possibly contaminated, since oceans are polluted by plastic debris. In their work, the presence of MPs was analyzed in numerous types of Chinese sea salt brands, where it was found 7–681 MPs/kg of sea salt. After this first study was published, six others were able to characterize and identify (with relevant results) the presence of MPs in commercial table salts, with their concentrations varying mostly between sites [3, 5, 8, 29, 30, 31].
\nConsidering that sodium (Na+) is an essential element for our well-being [3] and the above information, it can be assumed that MP intake may vary depending on the country’s gastronomic culture and environmental pollution. For example, WHO suggests a maximum daily intake of 5 g of salt, however, the Portuguese population consumes, on average, 3 g more than the recommended [32]. We can then assume that the Portuguese people are subject to a greater exposure of microplastics via table salt consumption. Therefore, this study aims to analyze the available Portuguese table salts and determine the degree of microplastic contamination, depending on their origin and type of salt.
\nA total of seven geographically distinct saltworks were previously identified and selected for this study: Aveiro (Av), Figueira da Foz (FF), Rio Maior (RM), Tejo (Tj), Olhão (Ol), Tavira (Tv) and Castro Marim (CM) (Figure 1). In each region, samples of fleur de sel and artisanal coarse salt were collected (nt\n = 14), in triplicate, between February–April 2019 under the same brand.
\nLocation of Portugal’s main saltworks and respective sampling sites.
Depending on their origin, salts can have different designations. In all the selected saltworks, except for RM, both fleur de sel and coarse salt are produced through the solar evaporation of brackish and/or marine waters. Thus, salt originated from these solar saltworks is commonly named sea salt. However, in RM’s saltworks the salt is produced from the storm- and groundwater that leaches the halite deposits, present in the region, to form a brine. This one is then collected in open solar saltworks and undergoes the same evaporation processes as the remaining. Therefore, this type of salt is designated as “well salt” [33].
\nThe packages obtained from fleur de sel and artisanal coarse salt were sold in plastic bags of 200–250 and 1000–1500 g, respectively. Previous studies have already shown that plastic packaging does not influence the concentration of MPs in the final results [5, 8, 31].
\nA protocol, based on published studies [5, 14, 29], was developed to prevent microplastic contamination throughout the study. Protective gloves and white coats were implemented when handling any material or reagent, since numerous plastic fibers can be found in our hands and clothing, which can have in its composition synthetic fibers (e.g., polyester, nylon…) [34]. Moreover, all equipment was cleaned with previously filtered deionized water and 70% (v/v) ethanol. Finally, materials were protected and/or sealed [29].
\nThe deionized water used during the study was previously filtered with the aid of a vacuum pump using a 1 μm porosity cellulose nitrate membrane (Whatman®; CAT: 7190-002), thus, removing possible microplastic contamination. This filtered water was used to clean the equipment and dissolve the tested table salts, thus, preventing any contamination from external sources via microplastics [14].
\nThe microplastic extraction from both salt types was performed according to Iñiguez et al. [5], with some modifications. Briefly, 200 g of salt (fleur de sel or coarse salt) was homogeneously dissolved in 1 L of previously filtered deionized water. Next, the solution was placed in a centrifuge for 1 h at 1900 rpm in order to isolate the denser (in)organic material from the supernatant [5]. The supernatant was subsequently collected and filtered with the aid of a vacuum pump using a 5 μm porosity cellulose nitrate filter (Whatman®; CAT: 7195-004). According to Branca [35], the plastic particles are expected to be suspended in the supernatant due to density differences. Nevertheless, preliminary tests were performed to assess whether certain microplastics were “trapped”, or not, in the precipitate. No microplastics were found in all of the precipitates. After filtration, the membranes were carefully collected, preserved and sealed in Petri dishes and allowed to dry at room temperature. Each Petri dish was previously brushed with petroleum jelly to fix the membrane and avoid, consequently, the plastic microparticles displacement during microscopic or stereoscopic manipulations. All filtrations and hand-manipulations were performed inside a fume chamber, hence, avoiding any kind of atmospheric contamination [29].
\nThe visual identification of microplastics was performed using a stereoscope (Carl Zeiss Stemi DV4 CLS120X) and a camera. A total of 59 membrane filters were recorded since some replicas required more than one membrane due to clogging. The open software ImageJ (v1.80) was used to analyze each collected picture. The classification of microplastics was made according to their shape and color [3] (Table 1).
\nShape | \nColor | \n
---|---|
\n
| \n\n
| \n
Microplastics classification according to their shape and color as used in this study (adapted from [3]).
A one-way ANOVA, followed by Tukey’s HSD multiple comparison test, was performed in order to discover significant statistical differences between the abundance of microplastics of each region, for the same salt type (fleur de sel and coarse salt). Homogeneity and normality tests were applied to the data to validate the tests. Additionally, several independent sample t-student tests were employed to understand the differences between salt types, in each saltworks region. All analyses were performed with a significance level of 0.05. All statistical tests were performed using the SPSS v25 software.
\nIn this study, all samples (nt\n = 14) of artisanal fleur de sel and coarse salt were contaminated by microplastics. Overall, 23,175 anthropogenic plastic microparticles were analyzed, of which approximately 64% corresponded to fibers, 35% to irregular fragments, and only <1% to films (Figure 2A). Indeed, fibers were the most predominant type of microplastic (>50%) present in all the studied regions, except in Rio Maior and Olhão (Figure 2B). Here, a higher percentage of fragments (51.8 and 56.5%, respectively) was found in coarse salt and fleur de sel, respectively. Films were also present in all samples, although in lower percentages (<2.5%) when compared to the other microplastic shapes (Figure 2B). No spherical and Styrofoam microparticles were identified in all samples.
\nPercentage of the different shapes of microplastics identified (A) throughout the study and (B) in each saltworks region. Microspheres and Styrofoam microparticles were not found. FS—Fleur de sel; CS—Coarse salt.
The most common colors found were transparent (54.9%), blue (15.3%), and black (14.6%), corresponding to roughly 85% of the analyzed microplastic polymers (Figure 3A). Gray and green accounted for about 4.6 and 3.2%, respectively. The remaining 7.5% includes microplastics with the colors designated as yellow, white, beige, brown, orange, pink, red, and violet (Figure 3A).
\nPercentage of the different colors of microplastics identified (A) throughout the study and (B) in each saltworks region. “Other” represents the sum between the following colors: beige, brown, orange, pink, red, violet, yellow, and white. No multicolor microplastics were identified. FS—Fleur de sel; CS—Coarse salt.
According to Figure 3B, transparent was the most predominant color (>40%) throughout all sampled regions. From the remaining colors, blue and black proved to be the most prevalent in all regions when compared to the remaining colors (Figure 3B). No multicolored microplastics were found in this study.
\nMoreover, it was possible to observe a high amount of lesser dense organic matter throughout the membrane filter analysis (e.g., small invertebrates, Artemia sp. cysts, feathers, vegetal organic matter...; Figure 4), which demonstrates the degree of impurities present in these types of salt.
\nDifferent types of organic and inorganic particles found in artisanal table salts: (A) Artemia sp. cysts, present in most of fleur de sel samples; (B) an invertebrates’ chitin; (C) insects body; (D, F, I) overview of a membrane filter being analyzed; (E) birds’ feather; (G) a mesoplastic, with more than 5 mm; (H) blue microplastic fragment, identified in most samples across regions.
\nFigure 5 shows the significant differences between the different types of salt (artisanal fleur de sel and coarse salt) in each saltworks’ region. According to Figure 5, significantly higher values (p < 0.05) of microplastics in the fleur de sel were found in all studied regions, when compared to coarse salt (Av – t\n(4) = 2.816, p = 0.048; FF – t\n(4) = 4.000, p = 0.016; Tj – t\n(4) = 7.376, p = 0.002; Ol – t\n(4) = 2.990, p = 0.040; Tv – t\n(4) = 5.249, p = 0.006), except for Rio Maior’s (t\n(4) = 1.457, p = 0.219) and Castro Marim’s (t\n(4) = 2.152, p = 0.098) saltworks (see Table 2 for mean and standard deviation values). Moreover, regarding artisanal coarse salt, statistically significant differences were detected between regions according to the one-way ANOVA (F\n(6.14) = 18.752, p = .000). Tukey’s post hoc test revealed that Rio Maior artisanal coarse salt contains a significantly higher amount of microplastics than the coarse salt from the other regions studied (Av, p = 0.012; FF, p = 0.000; Tj, p = 0.000; Ol, p = 0.000; Tv, p = 0.000; CM, p = 0.001). However, there was no statistically significant differences (p > 0.05) between the different fleur de sel samples from the various studied saltworks (p = 0.170).
\nComparison between the abundance of plastic microparticles present in the artisanal fleur de sel (FS) and coarse salt (CS) from the various saltworks selected for this study. Each value represents the mean ± standard deviation. Asterisks represent statistically significant differences between fleur de sel and coarse salt according to Student’s t-test. *—p < 0.05; **—p < 0.01. Different letters represent statistically significant differences (p < 0.05) between samples of artisanal coarse salt across the various regions studied. There are no statistically significant differences (p > 0.05) between the samples of fleur de sel.
\n | Microplastic particles per kilogram (Kg) | \n|||||||
---|---|---|---|---|---|---|---|---|
\n | \nFleur de sel\n | \nCoarse salt | \n||||||
\n | Min | \nMax | \nMean | \nSD | \nMin | \nMax | \nMean | \nSD | \n
Av | \n3120 | \n5050 | \n4420.0 | \n1126.0 | \n1670 | \n2735 | \n2351.7 | \n591.9 | \n
FF | \n2675 | \n3730 | \n3320.0 | \n565.4 | \n1085 | \n2040 | \n1603.3 | \n482.7 | \n
RM | \n3780 | \n6430 | \n4830.0 | \n1408.0 | \n3985 | \n3900 | \n3611.7 | \n338.4 | \n
Tj | \n3255 | \n3900 | \n3621.7 | \n331.5 | \n1030 | \n1830 | \n1390.0 | \n406.0 | \n
Ol | \n2395 | \n4070 | \n3108.3 | \n864.7 | \n1585 | \n1630 | \n1615.0 | \n21.2 | \n
Tv | \n2510 | \n4235 | \n3310.0 | \n869.3 | \n595 | \n740 | \n666.7 | \n72.5 | \n
CM | \n2320 | \n3465 | \n2798.3 | \n595.3 | \n1700 | \n2270 | \n1978.3 | \n285.2 | \n
Minimum (min) and maximum (max) values of the number of microplastic particles per kilogram (kg), and respective mean and standard deviation (SD) for the different types of artisanal table salt (fleur de sel and coarse salt) collected in all regions.
Additionally, the region who presented the highest quantities of microplastics in artisanal fleur de sel and coarse salt was Rio Maior (4830.0 ± 1408.0 and 3611.7 ± 338.4, respectively). The lowest amount of fleur de sel and coarse salt was found in the two most southeastern saltworks of Portugal: Castro Marim (2798.3 ± 595.3) and Tavira (666.7 ± 72.5), respectively (Table 2).
\nThe main purpose of this study was to assess the level of anthropogenic contamination via microplastic particles of two types of table salts present in the Portuguese territory. Seven different locations were selected, where both artisanal fleur de sel and coarse salt were obtained for analysis, from the same brand.
\nIn Portugal, the vast majority of the salt production starts by capturing seawater, due to tidal changes, into several successive ponds with different widths and heights. Next, it undergoes through various evaporation processes, due to the wind and solar actions, improving the salt crystals’ precipitation. The coarse salt is then collected, roughly washed, and packaged. On the other hand, fleur de sel is only the first surface layer of formed salt produced in saltworks. This type of table salt is collected and immediately packaged without being previously cleaned [36]. Nevertheless, some types of salts may undergo sanitization, as well as a refining process, before packaging [8]. Therefore, to understand the level of contamination existing in the Portuguese saltworks, all the salts acquired for this study were of artisanal origin, i.e., no refinement or industrial treatment was applied.
\nOnce samples were analyzed, it was evident the presence of a high MP concentration compared to other studies already carried out in several countries (Table 3). These values may be a direct proof of the lack of refinement or treatment processes that undergo in Portuguese saltworks, thus, reflecting the traditional methods still used nowadays. Most studies related to the presence of microplastics in table salt samples either used refined, treated salts and/or salts from which there is no information on their treatment [5, 8, 14, 30, 31]. Hence, it becomes important to study and understand how refining processes influence the abundance of microplastics in table salts.
\nAbundance of MPs per Kg (nsamples) | \nPredominant | \nReferences | \n|||
---|---|---|---|---|---|
Sea salt | \nWell salt | \n\nFleur de sel\n | \nShapes | \nColors | \n|
550–681 (5) | \n7–204 (5) | \n— | \nFr/Fb | \nBLa/G/BLu/W | \n[14] | \n
50–280 (16) | \n115–185 (5) | \n— | \nFb | \nBLa/G/ BLu/W | \n[5] | \n
0–10 (17) | \n0 (5) | \n— | \nFr/Fb/Fl | \nND | \n[3] | \n
16–84 (5) | \n— | \n— | \nFb/Fr/Fl | \nND | \n[29] | \n
46.7–806 (11) | \n113–367 (1) | \n— | \nFb/Fr | \nBLu/G/ R/T | \n[30] | \n
22–19,800 (12) | \n— | \n— | \nFr/Fb | \nBLa/T/ G/BLu | \n[31] | \n
0–13,629 (28) | \n0–148 (9) | \n— | \nFr/Fb | \nW/T/ BLa/BLu | \n[8] | \n
595–5090 (6) | \n3325–6430 (1) | \n2320–6430 (7) | \nFb/Fr | \nT/BLu/ BLa | \nThis study | \n
Comparison between the concentrations of MPs found in several published articles and the current study.
The microplastic particles are ordered from most to least predominant.
Fr—Fragments; Fb—Fibers; Fl—Films; BLa—Black; BLu—Blue; G—Green; R—Red; T—Transparent; W—White; ND—No data.
Overall, fleur de sel presented always higher contamination values of MPs than those found in coarse salts. These salt “scales” are formed at the crystallizers’ surface and, as such, greater air contamination of plastic particles is expected [2]. Also, since it does not undergo any cleaning process up to its packaging, it is expected a higher concentration of MPs, when compared to artisanal coarse salt.
\nMoreover, laboratory errors should be considered while manipulating samples. For instance, MPs were only analyzed using a stereoscope, with most of them measuring less than 500 μm. However, several studies indicate that from this size an underestimation of the real value may occur. Hidalgo-Ruiz et al. [37], stated that the visual identification of MPs is a valid method for dimensions superior to 500 μm, while MPs smaller than this threshold need to be analyzed using stricter methodologies. A visual identification-only approach can lead to underestimations ranging from 20% [38] to 70% [37], with that percentage increasing inversely with MPs’ size [31].
\nAmong the studies conducted so far, two presented similar results to those found in the Portuguese table salts: Renzi and Blašković [31] analyzed sea salt from Italy and Croatia and found between 22 and 19,800 MPs/Kg; and Kim et al. [8], that discovered 0 to 13,629 MPs/Kg and 0 to 148 MPs/Kg in sea salt and well salt, respectively, from worldwide salt samples. In this study, values ranged from 595 to 5090 MPs/Kg in sea salt and from 3325 to 6430 MPs/kg in Rio Maior’s well salt.
\nRegarding fleur de sel, values ranged from 2320 to 6430 MPs/Kg and, for coarse salt, between 595 and 3985 MPs/Kg. Until now, only Portuguese salt has had a higher concentration of MPs in well salt [33], when compared to sea salt. Unfortunately, there is a lack of studies in other regions with similar characteristics to Rio Maior’s saltworks, which do not allow for further data analysis. Concerning the MPs classification (shape and color), this study presented similar results to Gündoğdu [29], Iñiguez et al. [5], and Kosuth et al. [30], with fibers and fragments being the most predominant overall, as well as, black, blue, and transparent microplastics.
\nTherefore, we can argue that regardless of its source, microplastic contamination in table salts is an emerging concern, mainly due to their public health implications and environmental pollution. Indeed, microplastics are consumed not only through table salts but also via tap water, beer, honey [30], atmospheric air [2] and a wide variety of seafood. In fact, bivalves are the most studied group of animals since most species are filterers and become easily contaminated [39, 40, 41]. Microplastics can be hazardous already by themselves in the environment, however, they also function as transporters/emitters of persistent organic pollutants (e.g., bisphenol A, organochlorides) due to their adsorption ability. Hence, it is important to investigate and evaluate possible transmission risks in which microplastics may affect public health [5].
\nThe World Health Organization recommends a maximum daily salt (Na+) intake of 5.0 g/day. Nevertheless, the Portuguese population generally consumes 8.0 g/day, due to a strong and rooted gastronomic culture. Therefore, with the values obtained in this study, Portuguese people would consume, on average, approximately 7443 or 12,325 MPs/year depending on the table salts origin (sea salt and well salt, respectively). If we calculate by the salt type, an average Portuguese person can consume 5551 or 10,769 MPs/year if they consume only coarse salt or fleur de sel, respectively. However, these values are only theoretical and that in reality the amount MPs ingested is relatively smaller, since WHO also takes into account the salt found in food additives and processed food for the maximum daily salt intake threshold [3].
\nThe present study was the first to assess the presence/absence of microplastic polymers in fleur de sel, a type of salt formed at the surface of saltworks’ crystallizers. Overall, microplastics were found in all samples of Portuguese table salt, regardless of their origin and type, with higher contamination values being found in Rio Maior’s “well salt”.
\nMoreover, more studies are needed, since salt is a very common and well-rooted ingredient in Portuguese gastronomic culture. In fact, there are other available table salts to the population that were not studied yet. Additionally, new management tools need to be applied to decrease the concentration of impurities (e.g., insects’ feathers, exoskeletons, etc.,…) and contaminants, such as microplastics.
\nNowadays, research needs to be increasingly strengthened regarding microplastics contamination so that better regulations can exist together with a broader understanding. Also, these regulations need to be supported by government agencies in order to implement actions that reduce the emission of plastics into the environment and, thus, preventing environmental and human impairments.
\nThis study was funded by the “Fundação para a Ciência e a Tecnologia, I.P. (FCT), Portugal, with national funds (FCT/MCTES, “orçamento de Estado”, project reference PTDC/MAR-PRO/1851/2014), and the European Regional Development Fund (ERDF) through the COMPETE 2020 program (POCI-01-0145-FEDER-016885) through the project “PLASTICGLOBAL—Assessment of plastic-mediated chemicals transfer in food webs of deep, coastal and estuarine ecosystems under global change scenarios” that is also funded by the Lisboa 2020 program (LISBOA-01-0145-FEDER-016885). The study was also supported by the Strategic Funding UID/Multi/04423/2013 through national funds provided by FCT and ERDF in the framework of the program Portugal 2020 to CIIMAR.
\nThe authors declare no conflict of interest.
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