From: Low presence of potentially toxic elements in Singapore urban garden soils
Ref. | Site | Cd | Cu | Pb | Zn |
---|---|---|---|---|---|
d | Forest; Nee Soon, upper Catchment [medians] | bdl | 5 ± 5 | 13 ± 6 | 23 ± 6 |
d | Forest; Nee Soon, lower Catchment [medians] | bdl | 12 ± 4 | 18 ± 7 | 33 ± 11 |
b | Golf course (3 locations) | NA | 12–14 | 20–47 | 52–73 |
d | Disturbed lands, Nee Soon Catchment [medians] | bdl | 16 ± 6 | 24 ± 9 | 43 ± 15 |
e | Forest soils (variable geology) | bdl–0.03 | 7–20 | 9–17 | 13–61 |
f | Park soils (4 locations)a | 0.05–0.08 | 5–11 | 14–21 | 11–24 |
p | Park soils (3 locations)a | 0.46–1.66 | 6–14 | 14–37 | 45–71 |
f | Airport/industrial area soils (2 locations)a | 0.06–0.08 | 7–16 | 20–26 | 13–31 |
i | Reservoir susp. sediment (Kranji & MacRitchie) | NA | 15–16 | 20–43 | 49–73 |
g | Residential soils (7 sites island-wide) | 0.45–1.68 | 3–90 | 6–70 | 9–93 |
g | Reservoir sediments (3 sites) | 0.79–1.73 | 8–61 | 15–65 | 1–68 |
d | Military lands, Nee Soon Catchment [medians] | bdl | 44 ± 34 | 56 ± 37 | 77 ± 49 |
b | Forest; Nature Reserve (MacRitchie) | NA | 6–19 | 9–38 | 29–123 |
b | Residential area (7 sites in Bishan) | NA | 13–57 | 16–46 | 70–151 |
i | Reservoir sediments (MacRitchie) | NA | 13–21 | 19–64 | 75–133 |
q | Mangrove sediment (S. Buloh & S. Khatib Bonsu) | 0.18–0.27 | 7–32 | 12–32 | 51–120 |
g | Field soils (7 sites island-wide) | 0.45–1.42 | 1–105 | 5–89 | 1–150 |
a | Parks (Island wide; 10 locations) | bdl | 9–70 | bdl–61 | 33–190 |
h | MacRitchie Reservoir sediments (9-m core) | ~ bdl–0.40 | ~ 1–370 | ~ 1–55 | ~ 1–135 |
a | Gardens (10 locations island-wide) | bdl–3.2 | 10–76 | bdl–37 | 71–164 |
a | Woodlands (10 locations island-wide) | bdl–6.4 | 11–50 | bdl–33 | 19–146 |
c | Forest; Bukit Gombak [medians] | 5.76 ± 5.16 | 36 ± 24 | 14 ± 6 | 100 ± 27 |
o | Johore Strait marine sediments | 0.11–0.36 | 11–93 | 27–70 | 69–231 |
i | Reservoir sediment (Kranji) | NA | 21–29 | 35–82 | 128–367 |
r | Estuary sediment (Punggol) | bdl–1.37 | 4–439 | 1–157 | NA |
s | Coastal sediments (island wide) | bdl–1.6 | 1–1781 | 1–82 | 95–281 |
t | River sediment (Singapore river) | ~ 0.1–1.0 | ~ 15–95 | ~ 40–240 | ~ 100–600 |
b | Industrial (Jurong West; 7 sites) | NA | 12–194 | 29–167 | 111–837 |
b | Road side soils (heavy traffic area) | NA | 30–68 | 27–1981 | 124–938 |
k | Road sediment; residential [means] | 0.71 ± 0.30 | 247 ± 54 | 69 ± 26 | 275 ± 55 |
k | Road sediment; commercial [means] | 0.30 ± 0.10 | 98 ± 76 | 111 ± 15 | 620 ± 186 |
p | Industrial zone soils (8 locations)a | 0.66–1.63 | 16–258 | 10–242 | 40–708 |
l | Suspended sediment; residential road runoff | 0.89–3.03 | 11–74 | 5–206 | 16–941 |
l | Suspended sediment; industrial road runoff | 2.13–8.59 | 30–671 | 25–182 | 112–2006 |
g | Industrial soils (3 sites) | 1.11–3.21 | 1–485 | 51–235 | 15–3594 |
j | Residential road sediment | NA | 203–1294 | 135–395 | 704–2105 |
k | Road sediment; industrial [means] | 2.41 ± 1.0 | 9069 ± 3742 | 338 ± 56 | 1696 ± 446 |
j | Road sediment (industrial areas) | NA | 251–4271 | 144–744 | 836–11,960 |
n | Fly ash from municipal incinerator | 95 | 570 | 2000 | 6288 |
m | Fly ash, Tuas solid waste incinerator [means] | 130 | 987 | 2120 | 8072 |