Table 2 Statistical characteristics of nitrate concentration in the studied wells in the Tehran–Karaj aquifer during the study period (2007–2018). St.D stands for the standard deviation.
From: Human health risk of nitrate in groundwater of Tehran–Karaj plain, Iran
Sampling year | Mean (mg/L) | St.D (mg/L) | Max (mg/L) | Median (mg/L) |
|---|---|---|---|---|
2007 | 34.1 | 26.1 | 102.3 | 24.8 |
2008 | 33.5 | 26.1 | 120.9 | 24.8 |
2009 | 36.1 | 28.2 | 136.4 | 27.9 |
2010 | 36.2 | 30.3 | 148.8 | 24.8 |
2011 | 32.7 | 22.6 | 117.8 | 26.3 |
2012 | 28.3 | 17.2 | 89.9 | 24.8 |
2013 | 29.3 | 16.9 | 68.2 | 21.7 |
2014 | 36.9 | 24.6 | 117.8 | 27.9 |
2015 | 32.1 | 20.1 | 130.2 | 27.9 |
2016 | 34.9 | 19.8 | 120.9 | 31.0 |
2017 | 34.7 | 18.4 | 111.6 | 31.0 |
2018 | 34.0 | 13.7 | 68.2 | 34.1 |
