Table 2.
Median metal concentrations (mg kg−1) in different modified Community Bureau of Reference (BCR) extracted fractions of soils from the three study areas.
| Element | Fraction | Study site
|
p value § | ||
|---|---|---|---|---|---|
| Valcamonica Median (IQR) |
Bagnolo Mella Median (IQR) |
Garda Lake Median (IQR) |
|||
| Al | F1 | 32.2 (0.11–65.8) | 10.1 (3.59–17.4) | 0.11 (0.11–7.49) | <0.001 |
| F2 | 2120 (871–8890) | 1280 (33.0–3110) | 24.1 (0.90–3430) | <0.0001 | |
| F3 | 881 (335–1360) | 820 (486–1270) | 768 (342–1250) | 0.15 | |
| R | 7780 (3270–13900) | 8620 (5980–9980) | 5220 (2980–9030) | 0.002 | |
| Total (BCR + R) | 10500 (4490–19200) | 10300 (8030–11800) | 6950 (3330–11200) | <0.001 | |
| Cd | F1 | 0.26 (0.09–0.62) | 0.44 (0.27–0.55) | 0.37 (0.15–0.50) | 0.01 |
| F2 | 0.63 (0.40–1.69) | 0.62 (0.41–0.98) | 0.56 (0.30–1.08) | 0.2 | |
| F3 | 0.09 (0.03–0.39) | 0.1 (0.04–0.15) | 0.15 (0.03–0.61) | 0.1 | |
| R | 1.43 (0.44–2.33) | 1.3 (0.94–1.50) | 0.86 (0.03–1.41) | <0.001 | |
| Total (BCR + R) | 2.54 (1.30–4.16) | 2.38 (2.05–2.71) | 2.04 (1.00–2.60) | <0.001 | |
| Cr | F1 | 0.52 (0.20–0.93) | 1.58 (1.05–1.99) | 0.74 (0.46–5.71) | <0.001 |
| F2 | 3.3 (1.20–13.4) | 2.24 (1.45–8.04) | 1.61 (0.22–253) | 0.1 | |
| F3 | 2.82 (0.02–17.3) | 2.16 (1.42–12.6) | 3.74 (0.67–49.6) | 0.05 | |
| R | 9.04 (3.66–16.9) | 9.25 (7.48–14.8) | 10.3 (4.81–15.8) | 0.6 | |
| Total (BCR + R) | 15.63 (6.96–34.5) | 18.1 (13.3–30.5) | 17.8 (7.21–277) | 0.3 | |
| Cu | F1 | 1.09 (0.08–8.19) | 0.079 (0.07–0.08) | 0.08 (0.07–7.18) | <0.001 |
| F2 | 18.1 (2.95–323) | 7.07 (0.09–25.0) | 0.1 (0.10–93.0) | 0.0004 | |
| F3 | 12.6 (1.24–87.6) | 6.85 (0.70–32.9) | 21.9 (0.58–130) | 0.02 | |
| R | 24.6 (3.42–45.6) | 19 (5.16–31.7) | 26.3 (4.07–49.0) | 0.1 | |
| Total (BCR + R) | 64.6 (24.8–373) | 31.2 (23.8–58.7) | 66.7 (23.4–163) | 0.005 | |
| Fe | F1 | 4.37 (0.04–7.85) | 0.44 (0.04–1.06) | 0.71 (0.04–4.76) | <0.001 |
| F2 | 2710 (1670–7850) | 1290 (350–3840) | 372 (6.63–5420) | <0.001 | |
| F3 | 571 (373–1350) | 512 (240–814) | 468 (147–1140) | 0.07 | |
| R | 10300 (3600–16400) | 9710 (7700–10800) | 6660 (3230–11400) | <0.001 | |
| Total (BCR + R) | 14200 (7650–19600) | 11800 (8570–13700) | 9270.00 | <0.001 | |
| Mn | F1 | 165 (108–280) | 124 (97.2–179) | 134 (94.2–198) | 0.005 |
| F2 | 681 (264–1650) | 419 (280–996) | 205 (116–477) | <0.001 | |
| F3 | 19.1 (10.7–98.6) | 17 (11.0–84.5) | 13.2 (5.73–80.3) | 0.04 | |
| R | 127 (35.2–308) | 75.1 (50.7–120) | 49.4 (21.7–68.0) | <0.001 | |
| Total (BCR + R) | 983 (473–2110) | 623 (466–1360) | 393 (288–747) | <0.001 | |
| Pb | F1 | 2.19 (0.74–4.46) | 2.31 (0.78–4.06) | 3.49 (2.24–4.84) | <0.001 |
| F2 | 35.9 (19.8–84.7) | 22.1 (6.30–36.1) | 7.53 (1.12–53.10) | <0.001 | |
| F3 | 3.53 (0.56–25.1) | 3.09 (0.56–30.9) | 11.7 (0.57–88.9) | 0.01 | |
| R | 4.33 (0.60–16.5) | 3.67 (2.23–12.7) | 5.3 (0.62–31.2) | 0.4 | |
| Total (BCR + R) | 47.1 (24.2–109) | 43.1 (27.0–50.0) | 37.3 (16.9–128) | 0.07 | |
| Zn | F1 | 34.5 (10.1–117) | 28.7 (5.76–37.7) | 11.5 (1.29–40.6) | <0.001 |
| F2 | 58.2 (22.6–247) | 47.8 (33.1–70.1) | 35.4 (4.63–108) | 0.03 | |
| F3 | 7.52 (2.16–24.7) | 6.86 (4.50–23.8) | 8.62 (1.49–156) | 0.5 | |
| R | 50.8 (16.3–149) | 45.3 (26.7–70.6) | 37.4 (13.8–102) | 0.1 | |
| Total (BCR + R) | 172 (70.4–426) | 128 (70.3–192) | 113 (32.4–305) | 0.01 | |
§
comparison between Valcamonica, Bagnolo Mella and Garda Lake using Kruskall-Wallis test