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[VD10] Nutrients in rivers
State

Key message
Good

The values ​​of biochemical oxygen demand, which is usually an indicator of organic pollution, have significantly decreased in Slovenia since 2005. Average levels of nitrate, orthophosphate and ammonium, which are slightly above background levels, do not show significant changes in the period.

Charts

Figure VD10-1: Average annual concentration of nitrate in rivers (mg N / l) (indicative value for the natural state is 1 mg N / l)
Sources:

Standardised Database for Water Quality Monitoring, Slovenian Environmental Agency, 2015

Show data
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Slovenia mg N/l 1.25 1.26 1.22 1.25 1.14 1.07 1.18 1.3 1.28 1.33
2006 2007 2008 2009 2010 2011 2012 2013 2014
Slovenia mg N/l 1.4 1.39 1.18 1.41 1.32 1.39 1.31 1.35 1.33
Figure VD10-2: Average annual concentration of orthophosphate in the rivers (mg P / l) (indicative value for the natural state is 0,010 mg P / l)
Sources:

Standardised Database for Water Quality Monitoring, Slovenian Environmental Agency, 2015

Show data
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
orthophosphate mg P/l 0.059 0.048 0.057 0.055 0.047 0.068 0.047 0.045 0.054 0.07
2008 2009 2010 2011 2012 2013 2014
orthophosphate mg P/l 0.031 0.034 0.049 0.049 0.055 0.053 0.041
Figure VD10-3: Average annual concentration of ammonia (mg N / l) (indicative value for the natural state is 0,015 mg N / l)
Sources:

Standardised Database for Water Quality Monitoring, Slovenian Environmental Agency, 2015

Show data
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
Slovenia mg N/l 0.355 0.192 0.263 0.216 0.245 0.332 0.206 0.188 0.187 0.234
2008 2009 2010 2011 2012 2013 2014
Slovenia mg N/l 0.095 0.181 0.166 0.282 0.23 0.204 0.11
Figure VD10-4: Average annual value of biochemical oxygen demand - BOD5 (mg O 2 /l)
Sources:

Standardised Database for Water Quality Monitoring, Slovenian Environmental Agency, 2015

Show data
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Slovenia mg O2/l 3.03 3.32 2.67 2.84 2.81 3.76 2.94 3.62 2.61 2.97
2006 2007 2008 2009 2010 2011 2012 2013 2014
Slovenia mg O2/l 1.38 1.47 0.93 1.22 1.48 1.71 1.61 1.37 1.17

Methodology

Last modified
15.09.2014
Author(s)

Polona Mihorko, Slovenian Environment Agency