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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

ISSN: 2049-9957

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