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Vol.5 , No. 1, Publication Date: Jan. 18, 2018, Page: 28-33
 and congo red (СR) and cation of cyanine dyes pinacyanol (PNC) is considered. The spectral changes that occur when increasing amounts of anions are added to the PNC have been considered. The optical density of the mixture of dyes is much lower than the sum of the optical density of the dyes at a certain concentration. Such changes in the absorption spectrum of PNC indicate the intense interaction of various dyes and the formation of an ion associate. The stoichiometric ratios of the particles in the PNC+AR II and PNC+CR associates are 4:1 and 2:1. We have examined the effect of Cd<sup>2+</sup> or Pb<sup>2+</sup> on the spectral characteristics of ARII, СR and associates (PNC)<sub>4</sub>•АR ІІ, (PNC)<sub>2</sub>•CR in a wide range of metal concentrations (2•10<sup>-6</sup> M ‒ 2•10<sup>-4</sup> M). The addition of very small concentrations of heavy metals to the associate causes a change in the light absorption. Such effects open up new possibilities in increasing the sensitivity of quantitative determinations of small amounts of heavy metals (10<sup>-6</sup> M) in soils with the help of aqueous extracts.&picture=http://www.aascit.org/aascit/decorators/img/journal/904.jpg)
| [1] | Yana Alexandrovna Svishchova, Department of General Chemistry, V. V. Dokuchaev Kharkiv National Agrarian University, Kharkiv, Ukraine. |
| [2] | Sergey Andreevich Shapovalov, Research Institute of Chemistry, V N. Karazin Kharkiv National University, Kharkiv, Ukraine. |
The study of regularities in the formation of dissimilar associates is promising for the development of methods for the quantitative analysis of natural objects as agricultural soils. A heterogeneous association between multiply charged anions arsenazo II (ARII) and congo red (СR) and cation of cyanine dyes pinacyanol (PNC) is considered. The spectral changes that occur when increasing amounts of anions are added to the PNC have been considered. The optical density of the mixture of dyes is much lower than the sum of the optical density of the dyes at a certain concentration. Such changes in the absorption spectrum of PNC indicate the intense interaction of various dyes and the formation of an ion associate. The stoichiometric ratios of the particles in the PNC+AR II and PNC+CR associates are 4:1 and 2:1. We have examined the effect of Cd2+ or Pb2+ on the spectral characteristics of ARII, СR and associates (PNC)4•АR ІІ, (PNC)2•CR in a wide range of metal concentrations (2•10-6 M ‒ 2•10-4 M). The addition of very small concentrations of heavy metals to the associate causes a change in the light absorption. Such effects open up new possibilities in increasing the sensitivity of quantitative determinations of small amounts of heavy metals (10-6 M) in soils with the help of aqueous extracts.
Keywords
Dissimilar Associates, Arsenazo II, Pinacyanol, Congo Red, Cadmium, Lead
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