U ovom završnom radu su određene pH vrijednosti tla u kojem je uzgajana biljka vlasac zalijevanjem vodenim otopinama teškog metala: nikla, bakra i olova. Biljka je zalijevana u vremenskom periodu od mjesec dana. Na temelju dobivenih rezultata uočena je promjena pH vrijednosti tla u odnosu na pH vrijednost tla gdje je biljka tretirana samo vodovodnom vodom. Najveći utjecaj otopine teškog metala je uočen kod zalijevanja biljke vodenom otopinom bakrovog(II) sulfata pentahidrata gdje se pH vrijednost toliko smanjila da se to tlo svrstava u kategoriju umjereno kiselih tla (pH=6,05). Sukladno tome, došlo je i do ubrzanog propadanja biljke.

In this bachelor thesis, the pH values of the soils in which the herb plant shallot was cultivated by watering with the heavy metal aqueous solutions of nickel, copper and lead was determined. The plant was watered over a period of one month. Based on the results obtained, the pH value of the soil was changed in relation to the pH value of the soil where the plant was treated with water only. The most important influence of heavy metal solution was observed when watering the plant with an aqueous solution of copper (II) sulphate pentahydrate where the pH value was so much reduced that the soil was placed in the category of moderately acidic soils (pH=6.05). Accordingly, there was an accelerated decay of the plant.