Adsorption From Aqueous Solution by Gould R.F. (ed.)

By Gould R.F. (ed.)

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Detection: 546 nm Absorbance Units Full Scale (AUFS). 42 GENERAL CHEMISTRY CONSIDERATIONS Figure 3-6. High performance liquid chromatographic profile of desalted Acid Red N o . 114 at 546 nm. Acid Red N o . 35 m g / m l in methanol. 6 mm I D . 41 buffer and 10% ν / ν water. Solvent Program: Linear solvent gradient 40 to 100% Β in 30 min. 0 ml/ min. 05 Absorbance Units Full Scale ( A U F S ) . and 11% relative to the major component. The major peak comprised only 61% of the total chromatogram area, as shown in Figure 3-7.

The complexity of this problem for synthetic materials is illustrated by the analysis of the high molecular weight dyes, Direct Blue N o . 15 and Acid Red N o . 114, the structures of which are depicted in Figure 3-4. Dye materials are among the most difficult commercial chemicals to analyze because the synthetic processes yield a complex mixture of chemically similar compounds, organic and inorganic compounds are intentionally added to achieve desired properties, and standards are not available for most of the suspected impurities.

Prod. Res. Dev. 20(2):237-246(1981). Estrin, N . F . , Ed. CTFA Cosmetic Ingredient Dictionary, 2nd ed. (Washington, D . C : Cosmetic, Toiletry and Fragrance Association, 1977). J. M c G o v e r n , D . Lent, L . Kanerva, E . M . Knowlton, P . A . Sullivan, C T . C. Sigman. "Data Base of Carcinogens, Mutagens, and Tumor Promoters and Cocarcinogens," S R I International, developed for the National Cancer Institute under Contract N o . NO l-CP-95607 (February 1982). 12. H. and G . M . Williams. "CarcinogenTesting: Current Problemsand N e w Approaches," Science 214:401 -407 ( 1981 ) .

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