Alizarin red C
Offer type: salePublished: 01.04.2015
| Price: | 300 UAH |
| Seller: |  menedzher Tat'yana |
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| Address: | Ukraine, Donets'ka Oblast', Donetsk |
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ALIZARIN RED (alizarin S; Na-salt of 9,10-dihydro-3,4-dihydroxy-9,10-diokso-2-anthracenesulfonic), molecular weight 360,28; orange-yellow in-in; melting point 300 ° C; the Sol. in water, ethanol, no Sol. in benzene, gasoline, chloroform. In water R-ry RSA for alizarin red and its singly charged anion resp. the 5.5 and 9.5; λmax 423 nm. Produced by sulfonation of alizarin. Alizarin red - reagent for photometric. the determination of Al, Sc, Y, and F-.
With Al it forms at pH 3.9 to 4.5 complex of structure 1 :2, the maximum absorption-cerned observed at 500 nm, the lower boundary of the designated contents Andl of 0.04 μg/ml. Definition of Sc is carried out at pH 3.5. When determining Y its complex with alizarin red ( λmax 550 nm) previously extracted from boric-ammonium buffer R-RA at pH 3.5 butanol, Isobutanol or tributyl phosphate. The definition of F is based on its ability to destroy the complexes by alizarin red with Th, Zr, CE at pH 2-4, the lower boundary of the designated contents 1 μg/ml Alizarin red S - metallochromic indicator in the titration of ions F - salts of Zr or Th at pH 2-3, and an acid-base indicator (color transition at a pH of 3.7 to 5.2 from yellow to pink when the pH of 10.0-12.0 from purple to yellow).
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