Table 3.

Comparison of Heavy Metal Concentrations in Soil of E-waste Dumpsites Across Studies

Location	Type of Soil or Sediment		Cr	Ni	Cu	Zn	Cd	Hg	Pb	Reference
			mgkg−1 dry weight
Lagos, and Ibadan, Nigeria	E-waste dumpsite soils									This study
	Surface soil (0–15 cm)	Range	103–325	17.5–128	50.0–5,390	105–3,420	0.03–6.30	-	246–2,840
	Subsoil (15–30 cm)	Range	107–118	12.0–104	51.8–3,830	77.8–1,930	0.03–5.85	-	114–1,630
	Subsoil (30–45 cm)	Range	47.5–111	11.0–47.5	42.8–2,780	27.5–1,750	ND-6.50	-	142–840
Taizhou, Zhejiang Province, China	Paddy soil (0–20 cm) in an e-waste recycling area (n = 6)	Range	54.4–74.1	25.8–46.2	56.1–236.9	-	0.55–7.86	0.24–0.76 5	1.96–64.6	53
Longtang Town, Northern Guangdong Province, China	Surface soil (0–15 cm) of a vegetable garden (n = 16)	Range	12.3±5.1	8.83±2.9	324±172	122±55.7	0.9±0.8	-	95.6±19.5	54
			9.66–19	7.04–10.3	210–450	92.4–142	0.26–1.17	-	73.3–134
	Surface soil (0–15 cm) of a paddy field (n = 11)	Range	17.3±8.1	34.5±26.6	155±94	166±76.7	1.0±0.4	-	61.8±24
			10.5–24.1	10.8–66	40.1–260	62.1–252	0.04–1.43	-	48.1–97
	Surface soil (0–15 cm) of an incineration site (n = 11)	Range	68.9±53	60.1±59	11,140±9,000	3,690±2,680	17.1±12.5	-	4,500±3 370
			23.6–122	12.2–132	1,500–21,400	682–8,970	3.05–46.8	-	629–7,720
Bangalore City, India	Soil of an e-waste recycling site in a slum area (n = 7)	Range	46–160	-	61.7–4,790	126–2,530	0.385–38.9	0.09–59	90.4–2,850	55
	Soil of an e-waste recycling area (n = 3)	Range	50–62	-	154–2,190	119–499	0.301–0.906	-	79.1–262