Table 3.

Analytical identification techniques of microplastics used in the studies analyzed in the present review. To simplify the table, references are here indicated with a number and the corresponding complete list is presented in the Online Resource 1

Microplastics analytical identification techniques	Number of studies	References (Online Resource 1)
Fourier-transform infrared spectroscopy (FTIR)	12	[1], [4], [9], [13], [29], [34], [35], [37], [43], [51], [52], [58]
Micro-Fourier transform infrared spectroscopy (Micro-FTIR)	15	[9], [12], [16], [25], [27], [31], [32], [36], [37], [46], [56], [60], [65] [66], [73]
Attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR)	15	[7], [8], [10], [11], [33], [38], [39], [45], [53], [59], [62], [63], [67], [68], [70]
Micro-attenuated total reflection Fourier transform infrared spectroscopy (Micro ATR-FTIR)	4	[53], [55], [57], [70]
Fourier Transform Near-Infrared spectroscopy (FT-NIR)	1	[1]
Raman spectroscopy	2	[7], [42]
Micro-Raman spectroscopy	6	[21], [23], [40], [49], [71], [74]
Semi-automated micro-Raman spectroscopy	1	[26]
Near Infrared Spectroscopy (NIR)	1	[28]
Differential scanning calorimetry (DSC)	1	[68]