Works by Racheva, Petya

Results: 17

An Ionic Liquid-Assisted Mixed Micelle-Mediated Centrifuge-Less Cloud Point Extraction Spectrophotometric Method for the Determination of Molybdenum(VI).

Published in:

International Journal of Molecular Sciences, 2025, v. 26, n. 10, p. 4597, doi. 10.3390/ijms26104597

By:

Divarova, Vidka;
Gajdošová, Andrea;
Racheva, Petya;
Gavazov, Kiril

Publication type:

Article

Extraction of Gallium(III) with a New Azo Dye in The Presence or Absence of Xylometazoline Hydrochloride.

Published in:

Croatica Chemica Acta, 2021, v. 93, n. 3, p. 159, doi. 10.5562/cca3722

By:

Racheva, Petya V.;
Milcheva, Nikolina P.;
Saravanska, Antoaneta D.;
Gavazov, Kiril B.

Publication type:

Article

Spectrophotometric Determination of Gallium(III) with 4-(2-Pyridylazo)-resorcinol and Nitron.

Published in:

Croatica Chemica Acta, 2015, v. 88, n. 2, p. 159, doi. 10.5562/cca2434

By:

Racheva, Petya Vassileva;
Stojnova, Kirila Trifonova;
Lekova, Vanya Dimitrova;
Dimitrov, Atanas Nikolov

Publication type:

Article

Some Ternary Phenylmethoxybis(tetrazolium) Complexes of Vanadium(IV,V) and Their Constants of Association.

Published in:

Croatica Chemica Acta, 2012, v. 85, n. 1, p. 53, doi. 10.5562/cca1885

By:

Gavazov, Kiril Blazhev;
Racheva, Petya Vasileva;
Lekova, Vanya Dimitrova;
Dimitrov, Atanas Nikolov;
Türkyilmaz, Murat;
Genç, Fatma

Publication type:

Article

A Semi-Micro Extraction Spectrophotometric Determination of Iron Using 4-Nitrocatechol and Xylometazoline Hydrochloride.

Published in:

Molecules, 2025, v. 30, n. 4, p. 899, doi. 10.3390/molecules30040899

By:

Racheva, Petya V.;
Saravanska, Antoaneta D.;
Toncheva, Galya K.;
Kiradzhiyska, Denitsa D.;
Milcheva, Nikolina P.;
Divarova, Vidka V.;
Pencheva, Ina P.;
Stojnova, Kirila T.;
Delchev, Vassil B.;
Gavazov, Kiril B.

Publication type:

Article

Mono- and Binuclear Complexes in a Centrifuge-Less Cloud-Point Extraction System for the Spectrophotometric Determination of Zinc(II).

Published in:

Molecules, 2024, v. 29, n. 18, p. 4511, doi. 10.3390/molecules29184511

By:

Gavazov, Kiril B.;
Racheva, Petya V.;
Saravanska, Antoaneta D.;
Genc, Fatma;
Delchev, Vassil B.

Publication type:

Article

Extractive Spectrophotometric Determination and Theoretical Investigations of Two New Vanadium(V) Complexes.

Published in:

Molecules, 2023, v. 28, n. 18, p. 6723, doi. 10.3390/molecules28186723

By:

Gavazov, Kiril B.;
Racheva, Petya V.;
Saravanska, Antoaneta D.;
Toncheva, Galya K.;
Delchev, Vasil B.

Publication type:

Article

Use of a Hydrophobic Azo Dye for the Centrifuge-Less Cloud Point Extraction–Spectrophotometric Determination of Cobalt.

Published in:

Molecules, 2022, v. 27, n. 15, p. 4725, doi. 10.3390/molecules27154725

By:

Gavazov, Kiril Blazhev;
Racheva, Petya V.;
Milcheva, Nikolina P.;
Divarova, Vidka V.;
Kiradzhiyska, Denitsa Dimitrova;
Genç, Fatma;
Saravanska, Antoaneta D.

Publication type:

Article

Liquid-liquid extraction of ion-association complexes of cobalt(II)--4-(2-pyridylazo)resorcinol with ditetrazolium salts.

Published in:

Journal of the Serbian Chemical Society, 2015, v. 80, n. 2, p. 179, doi. 10.2298/JSC140514102V

By:

DIVAROVA, VIDKA V.;
STOJNOVA, KIRILA T.;
RACHEVA, PETYA V.;
LEKOVA, VANYA D.;
DIMITROV, ATANAS N.

Publication type:

Article

Ternary complexes of niobium(V) with nitroderivatives of catechol and tetrazolium salts. Extraction-spectro-photometric investigations.

Published in:

Chemija, 2010, v. 21, n. 2-4, p. 106

By:

Lekova, Vanya;
Racheva, Petya;
Stojnova, Kirila;
Dimitrov, Atanas;
Gavazov, Kiril

Publication type:

Article

Extraction-Chromogenic System for Cobalt Based on 5-Methyl-4-(2-thiazolylazo) Resorcinol and Benzalkonium Chloride.

Published in:

Acta Chimica Slovenica, 2021, v. 68, n. 1, p. 37, doi. 10.17344/acsi.2020.6035

By:

Hristov, Danail G. Georgiev;
Racheva, Petya Vassileva;
Toncheva, Galya Konstantinova;
Gavazov, Kiril Blazhev

Publication type:

Article

Study on the Complex Formation and the Ion-Association of Anionic Chelate of Molybdenum(VI) with Bidentate Ligand and the Cation of 2,3,5-Triphenyl-2Н-tetrazolium Chloride.

Published in:

Acta Chimica Slovenica, 2020, v. 67, n. 2, p. 594, doi. 10.17344/acsi.2019.5612

By:

Stojnova, Kirila;
Racheva, Petya;
Divarova, Vidka;
Yanev, Pavel;
Lekova, Vanya

Publication type:

Article

Study on the Chelate Formation and the Ion-association of Anionic Chelate of Molybdenum(VI) with 3,5-Dinitrocatechol and Monotetrazolium Cation.

Published in:

Acta Chimica Slovenica, 2018, v. 65, n. 1, p. 213, doi. 10.17344/acsi.2017.3860

By:

Stojnova, Kirila;
Divarova, Vidka;
Racheva, Petya;
Bozhinova, Kristina;
Lekova, Vanya

Publication type:

Article

Study on the Equilibria of the Complex Formation of the Ion-pair of Germanium(IV) with 4-Nitrocatechol and 1,4-Diphenyl-3-(phenylamino)-1H-1,2,4-triazole.

Published in:

Acta Chimica Slovenica, 2017, v. 64, n. 2, p. 365, doi. 10.17344/acsi.2017.3214

By:

Racheva, Petya;
Stojnova, Kirila;
Divarova, Vidka;
Lekova, Vanya

Publication type:

Article

Study on the Complex Equilibria of Molybdenum(VI) with 3,5-Dinitrocatechol and Ditetrazolium Salt.

Published in:

Acta Chimica Slovenica, 2016, v. 63, n. 3, p. 654, doi. 10.17344/acsi.2016.2513

By:

Stojnova, Kirila;
Racheva, Petya;
Divarova, Vidka;
Bozhinova, Kristina;
Lekova, Vanya

Publication type:

Article

Complex Formation in a Liquid-Liquid Extraction System Containing Co(II), 4-(2-Thiazolylazo)resorcinol and Monotetrazolium Salt.

Published in:

Acta Chimica Slovenica, 2016, v. 63, n. 1, p. 97, doi. 10.17344/acsi.2015.1987

By:

Divarova, Vidka;
Stojnova, Kirila;
Racheva, Petya;
Lekova, Vanya

Publication type:

Article

Ternary Ion-Association Complexes Of Cobalt with 4-(2-pyridylazo)Resorcinol and Tetrazolium Salts.

Published in:

Acta Chimica Slovenica, 2014, v. 61, n. 4, p. 813

By:

Divarova, Vidka V.;
Lekova, Vanya D.;
Racheva, Petya V.;
Stojnova, Kirila T.;
Dimitrov, Atanas N.

Publication type:

Article