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vaba hapniku hulk vesilahustes, mida harilikult väljendadakse mg/l, the amount of oxygen, in parts per million by weight, dissolved in water, now generally expressed in mg/l
O.D. . Limnoloogia sõnastik. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//lim/O.D./1/fra (19.06.2026)
