00779naa#a2200217#i#450# EN\\bibl\44195 20220127090412.4 1812-9498 20210524b2021####ek#y0engy0150####ca RU NEW SPECTROPHOTOMETRIC METHOD FOR DETERMINING TITANIUM(IV) IN NATURAL OBJECTS Journal article Astrakhan Astrakhan State Technical University 2021 7 с. Journal article local Химия. Кристаллография. Минералогия. Минераловедение. 54 Ragimova Adilya Jeyhun Mardanova Vusala Ismayil Maharramov Abel Maharram Nagiyev Khalil Jamal Chyragov Famil Musa vestnik.astu.org