Posted by Jenny Sendova on Thursday, 17 December 1998, at 10:57 a.m.
The Mathematical Secondary School "Academician Kiril Popov" is situated in Plovdiv. Plovdiv is the second biggest town in Bulgaria. It is situated in the Thracian lowland , which is the richest region in growing vegetables . The town is crossed by Maritza river , in which fall the waste waters of many factories . That is why we made our purpose to analyze water from this region for contents of nitrates , phosphates , oxygen and PH . For pupils ( students ) at the age of thirteen up to fifteen take part in the experiment . We analyze waters from the towns Krumovo and Kuklen and tap water from the town ( Plovdiv ) .
Town Plovdiv Krumovo Kuklen Standard
PH 3 2 1 7.2 - 7.3
Digested oxygen O2 6 ppm. 8 ppm. 8 ppm.
- Nitrates 0.01 ppm. 0.1 ppm. 0.1 ppm. 6 - 10 mg/l
Phosphates - - - 0.5 mg/l
Biological drain of oxygen - - - -
Muddiness - - - 1.5 mg/l
Bacterium coli - - - 1/100 cm3
microorganisms In standard In standard In standrad 50/1 cm3
We also analyzed water from Maritza river :
PH - 1
Nitrates - 0.2 ppm.
Phosphates - /
It is muddy.
As conclusion we may say that the water of these settlements is according to the standard.