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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

Postal Subscription Code 80-973

2018 Impact Factor: 3.883

Front. Environ. Sci. Eng.    2022, Vol. 16 Issue (1) : 8    https://doi.org/10.1007/s11783-021-1442-2
REVIEW ARTICLE
What have we known so far for fluorescence staining and quantification of microplastics: A tutorial review
Shengdong Liu1, Enxiang Shang2(), Jingnan Liu1, Yining Wang1, Nanthi Bolan3,4,5, M.B. Kirkham6, Yang Li1()
1. Key Laboratory of Water and Sediment Sciences of Ministry of Education, State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China
2. College of Science and Technology, Hebei Agricultural University, Huanghua 061100, China
3. School of Agriculture and Environment, The University of Western Australia, Perth, WA 6001, Australia
4. The UWA Institute of Agriculture, The University of Western Australia, Perth, WA 6001, Australia
5. Global Innovative Centre for Advanced Nanomaterials, College of Engineering, Science and Environment, University of Newcastle, Callaghan, NSW 2308, Australia
6. Department of Agronomy, Throckmorton Plant Sciences Center, Kansas State University, Manhattan, KS 66506, USA
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Abstract

• Fluorescence staining provides a fast and easy method to quantify microplastics.

• Factors that influence staining are summarized to obtain an optimum staining effect.

• Natural organic matter can be stained by dye and interfere with quantification.

• Fluorescence staining is applied in both field and laboratory studies.

• Future work involves developing new dyes and automated image-analysis methods.

Understanding the fate and toxicity of microplastics (MPs,<5 mm plastic particles) is limited by quantification methods. This paper summarizes the methods in use and presents new ones. First, sampling and pretreatment processes of MPs, including sample collection, digestion, density separation, and quality control are reviewed. Then the promising and convenient staining procedures and quantification methods for MPs using fluorescence dyes are reviewed. The factors that influence the staining of MPs, including their physicochemical properties, are summarized to provide an optimal operation procedure. In general, the digestion step is crucial to eliminate natural organic matter (NOM) to avoid interference in quantification. Chloroform was reported to be the most appropriate solvent, and 10–20 μg/mL are recommended as optimal dye concentrations. In addition, a heating and cooling procedure is recommended to maintain the fluorescence intensity of MPs for two months. After staining, a fluorescence microscope is usually used to characterize the morphology, mass, or number of MPs, but compositional analysis cannot be determined with it. These fluorescence staining methods have been implemented to study MP abundance, transport, and toxicity and have been combined with other chemical characterization techniques, such as Fourier transform infrared spectroscopy and Raman spectroscopy. More studies are needed to focus on the synthesis of novel dyes to avoid NOM’s interference. They need to be combined with other spectroscopic techniques to characterize plastic composition and to develop image-analysis methods. The stability of stained MPs needs to be improved.

Keywords Plastic particles      Fluorescence dyes      Identification      Concentration quantification     
Corresponding Author(s): Enxiang Shang,Yang Li   
Issue Date: 18 November 2021
 Cite this article:   
Shengdong Liu,Enxiang Shang,Jingnan Liu, et al. What have we known so far for fluorescence staining and quantification of microplastics: A tutorial review[J]. Front. Environ. Sci. Eng., 2022, 16(1): 8.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-021-1442-2
https://academic.hep.com.cn/fese/EN/Y2022/V16/I1/8
Fig.1  The proportion of research papers investigating the quantification and characterization of microplastic.
Sample origin Sample collection process Sample pretreatment process Ref.
Sampling location Sampling
equipment
Sampling details Sieving Density separation Digestion Filtration Extraction recovery
Fresh water Kinnickinnic River, USA Glass jar
1 L
NA NA NA 0.05 M FeSO4
H2SO4
30% H2O2
Polycarbonate filter
0.4 μm
NA Simmerman & Wasik, 2020
Fresh water Four rivers,
USA
Plankton tow net 200-μm Below river surface
0.3-1 m
NA 84.2 mg/L
NaCl
10% KOH Strainer
200 µm
NA Valine et al., 2020
Sea water Mississippi Sound, USA Glass jar
946 mL
Below surface water 25-μm mesh NA 0.05 M Fe (II)
30% H2O2
Polycarbonate filter
10 µm
NA Scircle et al., 2020
Beach sand Three beaches,
India
NA Top of beach sand
3–4 cm
5-mm mesh CaCl2
1.34 g/cm3
H2O2 Mesh
38 μm
89.5%-97.5% Tiwari et al., 2019
Sediment South Andaman beaches, India Metal spoon Top layer of beach
1 cm
3-mm
5-mm mesh
NaCl
1.2 g/cm3
0.05 M Fe (II)
30% H2O2
Vacuum filtration NA Patchaiyappan et al., 2020
Biota
(Macroinvertebrates)
Kinnickinnic River, USA D-shaped kick net 600-μm NA NA NA 0.05 M FeSO4
3mL H2SO4
30% H2O2
Steel sieve
20 μm
NA Simmerman & Wasik, 2020
Biota
(bivalve)
Puducherry coastline,
India
Bought in fish market NA NA NA 10% KOH Vacuum filtration
11 μm
NA Dowarah et al., 2020
Biota
(mussels)
Forth River,
UK
Stainless-steel
wired scrubber
NA NA Super-saturated
NaCl
Enzyme mixture
(Corolase 7089)
Vacuum filtration
0.8 μm
NA Catarino et al., 2018
Atmosphere Hamburg metropolitan area, Germany PE-funnel
PE bottle
Above ground level
100 cm
NA NA 15% v/v
NaClO
Vacuum filtration
5–13 μm
NA Klein & Fischer, 2019
Tab.1  Sampling and pretreatment processes of MPs for fluorescence staining
Fig.2  MP staining process in solution. (a) adding Nile Red in solvent, (b) staining in solution while heating and cooling, (c) vacuum filtering, (d) Nile Red stained MPs.
Fig.3  Quantification of MPs using fluorescence spectrophotometer (a) fluorescence stained PET microplastic when being excited, (b) fluorescence stained PET microplastic under bright-field, Scale bar= 650 μm, (c) correlation curve between fluorescence intensity and mass concentration of PET microplastic.
Fig.4  Photographs of fish tissues under a bright-field microscope (top row) and representative fluorescence images of PS-MPs in different fish tissues after 14?d of the exposure to 100?μg/L (bottom row), Scale bar=100 μm. Graph was adapted from ref (Ding et al., 2018) with permission.
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