Table 1 Descriptive statistics of heavy metal(loid)s concentration and pH value in urban park green space soils.
Item | As (mg/kg) | Cd (mg/kg) | Cr (mg/kg) | Cu (mg/kg) | Hg (mg/kg) | Ni (mg/kg) | Pb (mg/kg) | Zn (mg/kg) | pH | References |
|---|---|---|---|---|---|---|---|---|---|---|
Min | 6.77 | 0.11 | 52.10 | 34.14 | 0.01 | 36.74 | 13.58 | 55.73 | 7.80 | Present study |
Max | 25.10 | 1.93 | 166.95 | 803.09 | 0.11 | 655.67 | 79.86 | 134.30 | 9.35 | |
Mean | 11.85 | 0.53 | 77.72 | 171.15 | 0.03 | 125.42 | 27.13 | 81.97 | NA | |
Median | 10.34 | 0.46 | 73.19 | 141.59 | 0.02 | 96.52 | 24.11 | 77.39 | 8.81 | |
SD | 4.06 | 0.34 | 18.95 | 151.05 | 0.02 | 101.16 | 11.98 | 16.38 | 0.40 | |
CV (%) | 34.27 | 64.38 | 24.38 | 88.26 | 70.54 | 80.66 | 44.17 | 19.99 | NA | |
Exceed numbera | 18 | 64 | 43 | 65 | 40 | 65 | 47 | 54 | NA | |
Exceed rate (%) | 27.69 | 98.46 | 66.15 | 100.00 | 61.54 | 100.00 | 72.31 | 83.08 | NA | |
Risk screening valueb | 60.00 | 65.00 | NA | 18,000 | 38.00 | 900.00 | 800.00 | NA | ≥ 7.5 | MEEP47 |
BV in Gansuc | 12.60 | 0.12 | 70.20 | 24.10 | 0.02 | 35.20 | 18.80 | 68.5 | NA | CNEMC40 |
Lanzhou (China) | 11.50 | 0.33 | 61.00 | 26,45 | 0.09 | 30.29 | 28.33 | 91.53 | NA | Li et al.13 |
Tianshui (China) | 31.99 | 0.352 | 51.89 | 32.93 | 0.113 | 56.60 | 39.26 | 89.93 | 8.26 | Li et al.48 |
Guiyang (China) | 41.20 | 0.705 | 111.00 | 64.10 | NA | 62.60 | 63.40 | 171.00 | NA | Liang et al.49 |
Beijing (China) | 12.00 | 0.490 | 63.60 | 35.50 | NA | 27.10 | 36.40 | 146.00 | NA | Liu et al.2 |
Aberdeen (Scotland) | NA | NA | 23.90 | 27.00 | NA | 14.90 | 94.40 | 58.40 | NA | Paterson et al.50 |
Shahroud (Iran) | NA | 0.10 | 78.70 | 24.90 | NA | 28.20 | 22.10 | 82.10 | NA | Mirzaei et al.51 |
Madrid (Spain) | NA | NA | 16.90 | 36.60 | NA | 9.02 | 102.00 | 139.00 | NA | Izquierdo et al.52 |
