[VD10] Nutrients in rivers
[VD10] Nutrients in rivers
Key message
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.
Definition
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, 2011
| 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 | 2009 | ||||||||||
| nitrate | mg N/l | 1.2 | 1.4 |
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, 2011
| 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 | 2009 | ||||||||||
| orthophosphate | micro g P/l | 31.5 | 34.3 |
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, 2011
| 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 | 2009 | ||||||||||
| ammonium | micro g N/l | 94.7 | 180.6 |
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, 2011
| 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 | 2009 | ||||||||||
| BOD5 | mg O2/l | 0.9 | 1.2 |