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Citation: He Xiaowei, Xu Shengjie. STUDY ON THE COLOUR REACTION OF THE MULTICOMPONENT COMPLEXES OF HETEROPOLYACIDS WITH BASIC DYES Ⅴ. ETHYL RHODAMINE B-HETEROPOLYMOLYBDOPHOSPHORIC ACID-PVA SYSTEM[J]. Chinese Journal of Applied Chemistry, ;1989, 6(5): 39-43. shu

STUDY ON THE COLOUR REACTION OF THE MULTICOMPONENT COMPLEXES OF HETEROPOLYACIDS WITH BASIC DYES Ⅴ. ETHYL RHODAMINE B-HETEROPOLYMOLYBDOPHOSPHORIC ACID-PVA SYSTEM

He Xiaowei ,
Xu Shengjie

1.
Changchun Institute of Applied Chemistry, Academia Sinica

Received Date: 4 November 1988
Available Online: 21 February 1989

A new sensitive colour system of Ethyl Rhodamin B-molybdophosphoric acid-PVAhas been studied. The optimum conditions for pbosphorus determination are [HNO₃]=0.56mol/dm³,[MoO₄^2-]=2.4×10^-2mol/dm³, [ERB⁺]=8.0×10^-5smol/dm³ and 0.12% PVA. The ion-associate exhibits maximum absorptivity at 584nm. At the working wavelength of 586 nm its apparent molar absorptivity was found to be 3.2×10⁵ L·mol^-1·cm^-1.Beer's law is obeyed in the range of 0 to 1.5μg of P(V) per 25mL. The colour of the aqueous solution was stable for at least lh. The molar ratio of P(V) to FRB⁺ in ion-associate was established to be 1:4. Infrared spectra studies show that an ionic bond occurs between ERB and phosphomolybdate and that the structure of the dye molccule is not of effected by the formation of the ion-assosiate.The effect of inteifering ions, such as As(Ⅴ), Si(Ⅳ) can be decreased by increasing the acidity and adding mixed reductants. Phosphorus in steel and some chemical reagents were determined directly at 1×10^-5% level by the proposed methodwith satisfactory results.
- Ethyl Rhodamine B,
- Heteropolymolybdophosphoric acid,
- Specetrophotometry
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