Table 1.

Microplastics recovery from current results and reported in the literature.

Reference	Matrix	Particle size	Spike quantity (MPs g−1 ww)	Recovery
This study	Sludge	> 1 mm	2.0	97 ± 1 %
	Sludge	1 mm–500 μm	2.0	96 ± 1 %
	Sludge	500–150 μm	2.0	94 ± 4 %
Li et al., 2018 [3]	Sludge	550 μm	2.5	86 ± 4 %
	Sludge	75 μm	2.5	67 ± 4 %