Table 2 Frequency and proportion of soils exceeding risk screening values.
Element | Number of exceedances of risk screening values | ||||
|---|---|---|---|---|---|
pH ≤ 5.5 | 5.5 < pH ≤ 6.5 | 6.5 < pH ≤ 7.5 | pH > 7.5 | Total | |
Cu | 20 (76.9) | 52 (7.5) | 42 (38.5) | 94 (47.7) | 208 (52.0) |
Zn | 7 (26.9) | 10 (14.7) | 19 (17.4) | 59 (30.0) | 95 (23.8) |
As | 1 (3.8) | 4 (5.9) | 44 (40.4) | 93 (47.2) | 142 (35.5) |
Hg | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) |
Cd | 25 (96.2) | 68 (100.0) | 107 (98.2) | 120 (61.0) | 320 (80.0) |
Pb | 13 (36.1) | 27 (39.7) | 28 (25.7) | 52 (26.4) | 120 (30.0) |
Ni | 15 (57.7) | 30 (44.1) | 59 (54.1) | 14 (7.1) | 118 (29.5) |
Cr | 6 (23.1) | 22 (3) | 56 (51.4) | 60 (30.5) | 144 (36.0) |
pH | 26 | 68 | 109 | 197 | 400 |
