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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 and orthophosphate, 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, Environmental Agency of the Republic of Slovenia, 2009

Show data
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
nitrate mg N/l 1.2 1.3 1.1 1.1 1.2 1.3 1.3 1.3 1.4 1.4
2008
nitrate mg N/l 1.2
Figure VD10-2: Average annual concentration of orthophosphate in the rivers (mg P / l) (indicative value for the natural state is 10 mg P / l)
Sources:

Standardised Database for Water Quality Monitoring, Environmental Agency of the Republic of Slovenia, 2009

Show data
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
orthophosphate micro g P/l 59.3 47.8 56.9 55.1 46.8 68.4 47.4 44.9 53.9 70.2
2008
orthophosphate micro g P/l 31.5
Figure VD10-3: Average annual concentration of ammonia (mg N / l) (indicative value for the natural state is 15 mg N / l)
Sources:

Standardised Database for Water Quality Monitoring, Environmental Agency of the Republic of Slovenia, 2009

Show data
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
ammonium micro g N/l 355.3 191.8 262.8 215.5 244.5 332 205.9 187.7 186.9 233.6
2008
ammonium micro g N/l 94.7
Figure VD10-4: Average annual value of biochemical oxygen demand - BOD5 (mg O 2 /l)
Sources:

Standardised Database for Water Quality Monitoring, Environmental Agency of the Republic of Slovenia, 2009

Show data
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
BOD5 mg O2/l 2.7 2.8 2.8 3.8 2.9 3.6 2.6 3 1.4 1.5
2008
BOD5 mg O2/l 0.9

Methodology

Last modified
27.05.2009
Author(s)

Polona Mihorko, Environmental Agency of the Republic of Slovenia