Table 2. Particle identification specifications for tap water studies.

Study	Filter pore size	Method	Min size for spectral analysis	Particles extracted	Particles for analysis	% for analysis	Spectral similarity index	Verified MPs
Mintenig et al. [62]	3 μm, 0.2 μm	FTIR	≥20 μm	n/sa	n/s	100%	n/s	n/s
Pivokonsky et al. [64]	5 μm, 0.2 μm	RM	1 μm	n/s	n/s	~25%	80%	n/s
		FTIR	≥10 μm
Shruti et al. [66]	0.22 μm	m-RM	500 μm	n/s	n/s	n/s	n/s	n/s
Strand et al. [67]	~12 μmb, 0.2 μmc	FTIR	≥10 μm	n/s	n/s	10% of 3 out of 17 samples.	n/s	3%
Tong et al. [68]	0.2 μm	RM	n/s	n/s	n/s	n/s	n/s	n/s
Zhang et al. [70]	0.45 μm	m-FTIR	>10 μm	n/s	n/s	100%	70%	n/s

^a not specified.

^b for MP content.

^c for spectral analysis.