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Table 2 Distributions of measured water and sediment parameters in sampled sites

From: Spatial distribution and habitat suitability of Biomphalaria straminea, intermediate host of Schistosoma mansoni, in Guangdong, China

  N n(%) < LOD Min 25% 50% 75% Max Mean SD CV
Water variables
 pH 84 0 (0) 6.69 4.91 6.48 6.72 7.02 7.78 0.58 0.07
 Total nitrogen (TN, mg/L) 84 0 (0) 0.31 1.29 2.72 9.05 62.38 10.40 16.54 1.59
 Nitrate and nitrites (NOx−, mg/L) 84 1 (1.2) < LOD 0.32 0.81 1.9 12.22 1.66 2.38 1.43
 Ammoniacal nitrogen (NH3−N, mg/L) 84 16 (19) < LOD 0.10 0.38 1.12 10.81 1.11 2.03 1.83
 Total phosphorus (TP, mg/L) 84 1 (1.2) < LOD 0.07 0.14 0.24 3.47 0.25 0.46 1.84
 Chemical oxygen demand (COD, mg/L) 84 10 (11.9) < LOD 4.94 10.18 21.71 62.75 14.59 13.07 0.9
 Dissolved oxygen (DO, mg/L) 84 0 (0) 0.01 4.63 5.53 6.37 8.51 5.25 1.75 0.33
 Electrical conductivity (EC, mS/m) 84 0 (0) 8.47 68.85 135.95 224.75 1677 199.63 266.31 1.33
 Calcium (Ca, mg/L) 84 2 (2.4) < LOD 1.18 5.04 21.78 202.51 18.51 35.58 1.92
 Magnesium (Mg, mg/L) 84 4 (4.8) < LOD 0.66 1.10 1.53 3.15 1.10 0.65 0.59
 Copper (Cu, mg/L) 74 40 (54.1) < LOD < LOD < LOD 0.05 0.1 0.04 0.02 0.56
 Zinc (Zn, mg/L) 74 27 (36.5) < LOD < LOD 0.01 0.05 1.52 0.14 0.32 2.29
 Iron (Fe, mg/L) 56 6 (10.7) < LOD 0.17 0.44 1.02 5.34 0.81 1.01 1.25
 Manganese (Mn, mg/L) 74 2 (2.7) < LOD 0.05 0.14 0.27 1.86 0.27 0.37 1.37
 Cadmium (Cd, mg/L) 84 84 (100) < LOD < LOD < LOD < LOD < LOD – – –
 Lead (Pb, mg/L) 84 84 (100) < LOD < LOD < LOD < LOD < LOD – – –
 Chromium (Cr, mg/L) 84 84 (100) < LOD < LOD < LOD < LOD < LOD – – –
 Nickel (Ni, mg/L) 84 62 (73.8) < LOD < LOD < LOD 0.03 0.12 0.03 0.03 1.14
Sediment variables
 pH 74 0 (0) 3.94 6.64 6.97 7.31 8.28 6.84 0.7 0.1
 Electrical conductivity (EC, mS/m) 74 0 (0) 27.65 217.6 435 857.83 4685.8 676.29 817.11 1.21
 Total organic carbon (TOC, g/kg) 75 0 (0) 16.22 20.29 27.41 38.21 71.08 30.33 11.62 0.38
 Copper (Cu, mg/Kg) 71 15 (21.1) < LOD 0.13 1.04 3.28 107.27 4.68 13.82 2.95
 Zinc (Zn, mg/kg) 71 20 (28.2) < LOD < LOD 7.57 25.73 93.79 16.52 20.23 1.22
 Iron (Fe, mg/L) 64 21 (32.8) < LOD < LOD 298.54 340.8 675.12 260.63 184.35 0.71
 Manganese (Mn, mg/kg) 71 10 (14.1) < LOD 0.6 75.83 139.75 600.8 87.05 92.78 1.07
 Cadmium (Cd, mg/kg) 75 22 (29.3) < LOD < LOD 0.12 0.19 3.61 0.23 0.51 2.22
 Lead (Pb, mg/kg) 75 5 (6.7) < LOD 0.04 1.92 8.00 72.34 6.50 12.51 1.92
 Chromium (Cr, mg/kg) 75 73 (97.3) < LOD < LOD < LOD < LOD 4.69 – – –
 Nickel (Ni, mg/kg) 75 56 (74.7) < LOD < LOD < LOD 1.98 34.37 2.76 4.44 1.61
  1. LOD Limit of detection; All values below LOD were assigned a value equal to the LOD divided by 2
  2. N Number of samples, n: Number of samples < LOD; SD Standard deviation, CV Coefficient of variation, NDVI normalized difference vegetation index; Min Minimum, Max Maximum
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Infectious Diseases of Poverty

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