Table 1 Distribution of 85 tubewells manganese and iron concentration categories based on Bangladesh, WHO and JECFA drinking water quality guideline.

From: Human health risk assessment of elevated and variable iron and manganese intake with arsenic-safe groundwater in Jashore, Bangladesh

 

Category

N (%)

Mean

Min

Max

Median

IQR

Manganese (mg/L)

Minimal (0–<0.1a)

11 (13%)

0.05

0.02

0.08

0.04

0.03, 0.06

Elevated (0.1–0.4b)

36 (42%)

0.22

0.11

0.36

0.21

0.16, 0.27

High (>0.4)

38 (45%)

0.93

0.40

2.11

0.78

0.55, 1.07

Iron (mg/L)

Minimal (0–<0.3c)

23 (27%)

0.14

0.02

0.29

0.15

0.08, 0.20

Elevated (0.3–2.0d)

38 (45%)

0.75

0.31

1.94

0.65

0.39, 0.98

High (>2.0)

24 (28%)

3.72

2.10

6.20

3.56

2.97, 4.40

  1. aBangladesh drinking water standard16,18; bWHO health-based value10; cWHO aesthetic cut-off10;dJECFA provisional maximum tolerable daily intake for iron in water17,18.
Back to article page