Content of fluorine in soils in the vicinity of aluminium plant in Podgorica

Abstract

The purpose of this paper was to determine whether soils, located in the vicinity of the aluminium plant in Podgorica, are polluted with fluorine. For this purpose 60 soil samples (26 of brown and 34 of alluvial soil) were collected from two depths (0 to 20 and 20 to 40 cm). Total and available fluorine were determined by potentiometric method, after necessary preparations of soil samples for the analysis. It was found that in almost all soil samples the content of total fluorine was above 300 mg/kg - maximum permissible value for the content of this element in agricultural soils. Highest values were found on locations southwards of the aluminium plant. However, the content of available fluorine (soluble in water) in the soil samples is very low (average value is 0.70 mg/kg) indicating that major part of deposited fluorine had transformed itself into insoluble compounds like CaF2.Cilj ovoga rada je bio da utvrdi da li su zemljista, koja se nalaze u blizini aluminijumskog kombinata u Podgorici, zagadjena fluorom. U tu svrhu prikupljeno je 60 uzoraka zemljista (26 uzoraka smedjeg i 34 uzorka aluvijalnog) i to sa dve dubine (0 do 20 i 20 do 40 cm). U prikupljenim uzorcima zemljista odredjen je sadrzaj ukupnog i pristupacnog fluora. Za ovo je koriscena potenciometrijska metoda sa fluoridnom jon-selektivnom elektrodom. Utvrdjeno je da je kod vecine ispitivanih uzoraka zemljista sadrzaj ukupnog fluora iznad 300 mg/kg - maksimalno dozvoljene vrednosti za sadrzaj ovoga elementa u poljoprivrednim zemljistima. Najvece vrednosti su nadjene na lokacijama juzno od aluminijumskog kombinata. Medjutim, sadrzaj pristupacnog fluora (rastvorljivog u vodi) u uzorcima zemljista je vrlo mali (prosecna vrednost je 0,70 mg/kg), sto znaci da se najveci deo dospelog fluora transformisao u tesko rastvorljiva jedinjenja kao sto je CaF2. Koeficijenti korelacije izmedju sadrzaja fluora i nekih vaznih hemijskih i fizickih osobina zemljista imaju male vrednosti.