For citations:

Lubkova T.N., Lipatnikova O.A., Filatova O.R., Balykova I.V. X-ray fluorescence analysis of sulfate-ion in aqueous solutions by dried drop technique using a portable spectrometer. Moscow University Bulletin. Series 4. Geology. 2022;(2):59-67. (In Russ.) https://doi.org/10.33623/0579-9406-2022-2-59-67