Gasimova Gulbaniz A. Republic of AzerbaijanBakuInstitute of Zoology, Ministry of Science and Education of the Republic of Azerbaijan, 504th block, 1128th side street, A. Abbaszadeh St., Baku city AZ 1004, Republic of Azerbaijangqasimova@mail.ru Author's articles Influence of the geochemical background of the Western Caspian region of Azerbaijan on acid-base balance regulation of Pelophylax ridibundus (Pallas, 1771) (Amphibia, Ranidae) blood