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Table 4 Descriptive statistical analysis of 11 heavy metals in sediment samples of lakes along a rural to urban gradient in central China (Mean±SD)

From: Heavy metal gradients from rural to urban lakes in central China

Heavy metals Concentrations of heavy metals in different groups df F P
A B C D E
Cd (mg/kg) 0.50±0.16 0.32 ± 0.06 0.61 ± 0.16 0.76 ± 0.52 0.45 ± 0.11 4 1.904 0.162
As (mg/kg) 6.53±1.89a 10.04 ± 1.05b 10.69 ± 0.85b 10.66 ± 0.84b 11.15 ± 1.49b 4 6.651 0.003**
Co (mg/kg) 19.81±7.54 15.93 ± 1.40 14.12 ± 1.37 16.10 ± 0.95 16.63 ± 1.09 4 1.044 0.417
Ni (mg/kg) 32.10±9.24 43.67 ± 4.25 40.47 ± 3.30 45.38 ± 3.29 44.61 ± 3.50 4 2.867 0.06
Pb (mg/kg) 32.59±6.55 29.51 ± 2.15 62.87 ± 27.83 35.38 ± 4.16 39.06 ± 11.88 4 4.044 0.02
Cu (mg/kg) 105.45±113.98 37.37 ± 5.47 93.72 ± 74.94 46.60 ± 8.85 62.65 ± 35.21 4 0.754 0.571
Zn (mg/kg) 105.75±43.16 95.97 ± 13.15 166.71 ± 4.71 115.36 ± 20.40 134.41 ± 37.27 4 2.947 0.056
Cr (mg/kg) 111.35±43.93 95.50±4.89 111.29±36.18 94.42±6.45 99.78±8.47 4 0.219 0.923
Mn (g/kg) 0.97±0.64 0.42±0.14 0.59±0.10 0.63±0.20 0.71±0.16 4 1.637 0.217
Fe (g/kg) 37.57±12.66 38.64±3.11 38.26±3.01 39.75±3.60 39.90±3.08 4 0.232 0.916
Al (g/kg) 25.77±15.58 23.60±9.40 45.50±3.29 34.45±15.30 33.76±16.50 4 1.517 0.247
  1. * denotes significant difference P < 0.05; ** denotes significant difference P < 0.01