MODIFICATION OF ANALYTICAL FORMS IN INDIRECT ATOMIC-ABSORPTION DETERMINATION OF PHOSPHORUS

  • Antonina S. Alemasova Dr. Sci. (Сhem.), Professor, Head of Analytical Chemistry Department, Donetsk National University, Donetsk, Ukraine; tel.: +7(863) 308250, then 0713217740, e-mail: alemasovaa@gmail.com
  • Natalia D. Shchepina Cand. Sci. (Сhem.), Associate Professor, Analytical Chemistry Department, Donetsk National University, Donetsk, Ukraine; e-mail: shnatalina@mail.ru
  • Anastasia N. Chuprina master, Analytical Chemistry Department, Donetsk National University, Donetsk, Ukraine; e-mail: 74doninu@gmail.ru
  • Anastasia S. Sergeeva master, Analytical Chemistry Department, Donetsk National University, Donetsk, Ukraine; e-mail: anastasia-sergeeva1995@mail.ru
  • Aleksandr V. Dobrydin Senior Researcher, Analytical Chemistry Department, Donetsk National University, Donetsk, Ukraine; e-mail: av_dobrydin@mail.ru
Keywords: phosphorus, indirect determination, atomic absorption spectrometry.

Abstract

The new analytical forms for indirect atomic absorption determination of phosphorus – the 11-molybdoironphosphate heteropolycomplex and ion associate of copper(ІІ) phenantrolinate- molybdophosphate – were theoretical substantiated and tested which provide the lower detection limit, acceleration and simplification of the technique. Optimal conditions of the formation and separation (extraction and flotation) of the proposed complex compounds were studied.

The indirect atomic absorption method of phosphorus determination point is to bind of phosphate ions to a stable complex compounds with a marker element and then to determine marker element concentration using atomic absorption method determination and to calculate the analyte concentration using the concentration of the marker element.

Optimal conditions for ion associate flotation were established for the analytical form of the ion associate of copper(II) phenanthrolinate complex with molybdophosphate anion: the solution acidity is in pH range from 2.5 to 3.5, the concentration ratio of ammonium molybdate and copper phenantrolinate(II) is 80:1. It has been found that the proposed analytical form provides better selectivity while phosphorus determination. The 500-fold excess of Na+, K+, Ca2+, Mg2 +, W(VI), S2O32–, NO3, Cd2 + does not influence.

As for analytical form based on the triple metal-substituted phosphorus heteropolyanion using iron(III) as metal-indicator the extraction separation was used. The extractants and solvents of various types (alcohols, esters, ketones) were investigated. It was found that the best extractants are butan-2-one and cyclohexanone. The most suitable solvent for direct flame atomic absorption iron determination in the extract is butan-2-one. The iron analytical signal in the butan-2-one medium is 1.4 times more in comparison with the aqueous solution increases while it is 1.3 times less in cyclohexanone.

The indirect flame atomic absorption phosphorus determination technique in water was developed, which differs from the known before by improved reproducibility, speed, selectivity. The detection limit is 0.005 mg/l, the relative standard deviation does not exceed 0.06, the analysis duration is 35 minutes.

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Published
2018-09-12
How to Cite
Alemasova, A. S., Shchepina, N. D., Chuprina, A. N., Sergeeva, A. S., & Dobrydin, A. V. (2018). MODIFICATION OF ANALYTICAL FORMS IN INDIRECT ATOMIC-ABSORPTION DETERMINATION OF PHOSPHORUS. Kondensirovannye Sredy I Mezhfaznye Granitsy = Condensed Matter and Interphases, 20(3), 364-372. https://doi.org/10.17308/kcmf.2018.20/577
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