Table 4.

Raman shifts and assignment of microplastic and fiber classes. A laser line 514 nm, 2 mW at the sample was used. Others: compounds not included in the classification of “cellulose-based fibers” and “microplastics”. Most valuable spectroscopic markers are in bold.

Class	Number of Samples	Raman Shift (cm−1)	Raman Assignment	Reference
Microplastics	3	1065, 1131, 1171, 1297, 1334, 1386, 1418, 1441, 2724, 2849, 2883	Colored PE	Anger et al., (2018) [26]
Microplastics	3	404, 452, 532, 615, 814, 846, 944, 977, 1003, 1042, 1157, 1225, 1334, 1440, 1464, 2725, 2845, 2888, 2909, 2929, 2957	Uncolored PP and PVC	Chakraborty et al., (2022) [27]
Microplastics	4	446, 617, 812, 844, 944, 976, 1000, 1040, 1154, 1253, 1334, 1402, 1461, 1530, 1601, 2843, 2887, 2908, 2927, 2956	Colored PP	Anger et al., (2018) [26]
Microplastics	1	447, 611, 1145, 1184, 1254, 1291, 1343, 1401, 1455, 1530, 1600	Colored PVC	Chakraborty et al., (2022) [27]
Microplastics	2	634, 859, 1118, 1178, 1292, 1617, 1731, 2962, 3082	Uncolored PET	Anger et al., (2018) [26]
Other	12	1367, 1601	Amorphous carbon	Li et al., (2023) [31]
Cellulose based fibers	24	491, 1016, 1134, 1149, 1192, 1249, 1294, 1347, 1375, 1409, 1500, 1586	Grey/white dyed cotton fiber	Zapata et al., (2022) [32]
Cellulose based fibers	16	258, 468, 553, 601, 766, 945, 1016, 1099, 1149, 1254, 1313, 1368, 1464, 1576, 1611, 1700	Indigo dyed cotton fiber	Karapanayiotis et al., (2004) [33]
Cellulose based fibers	2	332, 381, 437, 461, 897, 1000, 1098, 1121, 1149, 1342, 1381, 1413	Uncolored cotton fiber	Was-Gubala and Machnowski, (2014) [34]