Što je bpk5 (biokemijska potrošnja kisika)?
Measures how much oxygen microorganisms need to break down organic matter in water over 5 days.
Zašto je važno?
High BOD means heavy organic pollution (sewage, agricultural runoff). The microorganisms consume all the oxygen, killing fish and creating dead zones.
EU limit
Varies (3 mg/L for good status rivers)
WHO smjernica
Not applicable for drinking water
Dobar raspon
< 3 mg/L O2 (clean river)
Jedinica
mg/L O2
Tumačenje rezultata
✓ U redu
Čista voda — nisko organsko onečišćenje
⚠ Povišeno
Umjereno onečišćenje — ekosustav pod stresom
✗ Izvan granice
Teško organsko onečišćenje — vjerojatno kanalizacija ili poljoprivredno otjecanje