Table 2. Vertical Distribution of MPs According to Size.

reference	studied area	depths	abundance	size
(47)	Xishuangbanna, China	0–10 cm	4487.5 ± 6440.2 particles·kg–1	994.2 ± 398.3 μm
		10–20 cm	2281.3 ± 2461.5 particles·kg–1	1222.9 ± 365.8 μm
(41)	Shanghai, China	0–3 cm	78.00 ± 12.91 items·g–1	1.91 ± 0.13 mm
		3–6 cm	62.50 ± 12.97 items·g–1	1.48 ± 0.11 mm
(42)	Sheshui River basin, China	0–10 cm	2693 ± 1470 n·kg–1	<1 mm: 69.8–97.4%
		10–20 cm	2351 ± 1064 n·kg–1	<1 mm: 62.5–98.5%
(52)	Beijing, China	0–10 cm	1107–3680 items/kg (average: 2451 ± 93 items/kg)	1.29 ± 0.94 mm
		10–20 cm	840–2867 items/kg (average: 1813 ± 47 items/kg)	1.15 ± 0.88 mm
		20–30 cm	680–2480 items/kg (average: 1461 ± 162 items/kg)	1.02 ± 0.78 mm
(29)	Hesse, Germany	0–30 cm	14.91 particles·kg–1	1.77 mm
		30–60 cm	4.52 particles·kg–1	1.45 mm
		60–90 cm	8.23 particles·kg–1	0.93 mm